Autoclaves

Midmark M4.9 Easyclave: troubleshooting and error codes

The ServiceForge knowledge base holds 54 documented symptoms for the Midmark M4.9 Easyclave, with 218 ranked causes, 104 diagnostic checks with test points and expected values, and 73 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Chamber pressure does not build during heat-up patient safety

Pressure fails to reach 1 psig in 1 minute or 4.93 psig within 16 minutes of heat-up mode start

Ranked causes

1. Door gasket leaking (common)
2. Pressure relief valve leaking (common)
3. Vent valve leaking (common)
4. Air valve leaking (common)
5. Leakage around fittings (occasional)
6. Steam heater malfunction (occasional)
7. Main relay contacts not closing (occasional)
8. Pressure transducer out of calibration (occasional)
9. Pressure transducer malfunction (rare)
10. Main PC board malfunction (rare)

First check

Inspect all seals and gaskets for leakage

Expected: No visible leakage

3 more checks with pass and fail actions, 10 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Sterilization temperature regulation questionable patient safety

For second time during Sterilization Mode (first time unit automatically restarts), questionable regulation of sterilization conditions (pressure/temperature) inside chamber

Ranked causes

1. Inadequate water in chamber trough (common)
2. Chamber overloaded with articles (common)
3. Steam leakage from chamber (occasional)
4. Temperature RTD out of calibration (occasional)
5. Pressure Transducer out of calibration (occasional)
6. Air Valve malfunctioning (occasional)
7. Pressure Transducer malfunctioning (occasional)
8. Steam Temperature Sensor (RTD) malfunctioning (occasional)
9. P.C. Board malfunctioning (rare)

First check

Visual inspection of water level in chamber trough

Test point: Chamber trough after FILL cycle
Expected: Adequate water level per equipment manual
Tools: Visual inspection

1 more check with pass and fail actions, 9 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Sterilizer not drying instruments properly

Instruments are wet after drying cycle is complete

Ranked causes

1. Sterilizer overloaded (common)
2. Operator fully opened or closed door before Dry Cycle complete (occasional)
3. Sterilizer not level (occasional)
4. Chamber filter clogged (common)
5. Vent valve malfunctioning or lines restricted (occasional)
6. Heater not functioning (occasional)
7. High limit switch stuck open (occasional)
8. Solid State Relay malfunctioning (rare)
9. Main relay malfunctioning (rare)

First check

Verify sterilizer is level

Test point: Base of unit
Expected: Level surface

3 more checks with pass and fail actions, 9 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Touchpad and display do not work with power present

Sterilizer has power but touchpad and display show no response or undefined characters with intermittent beep

Ranked causes

1. J12 connector loose on Main P.C. board (common)
2. Wire harness from transformer to J12 has broken wire (occasional)
3. Transformer has open or shorted winding (occasional)
4. Fuses F1 and F2 on Main P.C. board blown (occasional)
5. Ribbon cable from J1 to J3 disconnected (occasional)
6. J1/J3 ribbon cable has open lead (occasional)
7. Main P.C. Board malfunction (rare)
8. Display P.C. Board malfunction (rare)

First check

Inspect J12 connector condition

Test point: J12 on Main P.C. board
Expected: Connector fully seated and undamaged

7 more checks with pass and fail actions, 8 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Auxiliary temperature high during sterilization high voltage

Auxiliary temperature exceeds 568.4°F (298°C) during STERILIZE mode; items may not be sterile

Ranked causes

1. Sterilizer not level or water fill inadequate (common)
2. Level Sensor Probe dirty or corroded (common)
3. Vent Valve malfunctioning, staying open (occasional)
4. Air Valve doesn't close (occasional)
5. Auxiliary Temperature Sensor (RTD) malfunctioning (occasional)
6. SSR shorted causing constant heater power (occasional)
7. Main P.C. Board malfunctioning (rare)

First check

Check SSR resistance when heaters energized

Test point: SSR terminals 1 & 2
Expected: approximately 700 ohms when heaters on, +/- 50 ohms
Tools: Ohmmeter

7 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Code C232 displayed

Display shows FILL MODE, WATER LOW, ITEMS NOT STERILE, PUSH STOP TO RESTART

Ranked causes

1. Reservoir water level low (common)
2. Mesh filter restricted (common)
3. Water Fill Level Sensor dirty (occasional)
4. Fill Valve or related plumbing clogged (occasional)
5. Fill Valve solenoid coil malfunctioning (occasional)
6. J6 Plug connection loose or broken wires (occasional)
7. PC Board malfunctioning (rare)

First check

Check water level in Reservoir

Test point: Reservoir
Expected: water in correct range on the water level label

6 more checks with pass and fail actions, 7 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Steam temperature exceeds 276.1°F during operation patient safety

Unit displays error C570, C573, or C574. Steam temperature exceeds 276.1°F (135.6°C) during power-up, heat-up, or sterilize mode.

Ranked causes

1. Steam Temperature Sensor (RTD) malfunction (common)
2. Solid State Relay (SSR) shorted (occasional)
3. Main Relay malfunctioning (occasional)
4. Main P.C. Board malfunction (occasional)
5. Pressure lines restricted or clogged (occasional)
6. Pressure Transducer malfunction (occasional)
7. Cassette Tray Rack installed backward (rare)

First check

Measure RTD resistance at J5 connector

Test point: J5 on P.C. Board
Expected: 1090 ohms at 75°F or 2066 ohms at 545°F, ±10 ohms
Tools: Ohm meter

3 more checks with pass and fail actions, 7 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Auxiliary temperature high during heatup high voltage

Auxiliary temperature exceeds 568.4°F (298°C) during HEATUP mode; items may not be sterile

Ranked causes

1. Sterilizer not level or water fill inadequate (common)
2. Level Sensor Probe dirty or corroded (common)
3. Vent Valve malfunctioning, staying open (occasional)
4. Air Valve doesn't close (occasional)
5. Auxiliary Temperature Sensor (RTD) malfunctioning (occasional)
6. Main P.C. Board malfunctioning (rare)

First check

Check sterilizer level and water fill

Test point: Chamber water level and unit level
Expected: Unit level per manual; adequate water in trough
Tools: Level tool, visual inspection

1 more check with pass and fail actions, 6 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Biological indicator strip designates unit not sterilizing patient safety

Positive biological indicator or no color change on chemical indicator strip

Ranked causes

1. Sterilizer overloaded (common)
2. Improper operator procedure (common)
3. Wrong instrument trays used (occasional)
4. Wrong type of biological indicator (occasional)
5. Chemical indicator strip in contact with water (occasional)
6. Indicator strips stored in damp or hot environment (occasional)

6 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Dry mode pressure high caution

Unit displays Code C647; gauge pressure inside chamber equals or exceeds 2.18 PSIG (15 kPa) during DRY mode

Ranked causes

1. Door did not fully open; door gasket stuck (common)
2. Filter screen in trough restricted (common)
3. Vent Valve malfunctioning or lines restricted (common)
4. Pressure Transducer out of calibration (occasional)
5. Pressure Transducer malfunctioning (occasional)
6. P.C. Board malfunctioning (rare)

9 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

High-limit switch open during power up caution

Unit displays Code C980; Steam and/or Auxiliary High Limit switch opened for at least 1/4 second during POWER UP mode; requires unplug/re-plug

Ranked causes

1. Water level covering condensing coil outlet (common)
2. High Limit Switch weak, opens prematurely (common)
3. High Limit Switch opened normally due to overheat (occasional)
4. Wire or connector loose, disconnected or broken (occasional)
5. Insulation deteriorated between High Limit Switch and chamber (occasional)
6. P.C. Board malfunctioning (rare)

6 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Pressure over limit in sterilize mode caution

Chamber pressure exceeds 34.8 PSIG (240 kPa) during STERILIZE mode. Error C674 displayed. Items marked not sterile.

Ranked causes

1. Air valve malfunction (common)
2. Pressure transducer malfunction (common)
3. Temperature RTD out of calibration (occasional)
4. Steam temperature sensor (RTD) malfunction (occasional)
5. Solid State Relay (SSR) shorted (occasional)
6. P.C. board malfunction (rare)

First check

Test solid state relay resistance

Test point: SSR terminals 1 and 2
Expected: approximately 700 ohms when heaters on
Tools: Multimeter (ohms setting), run Service Diagnostics Steam/Auxiliary Heater Test

6 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Printer does not print

Printer does not generate data

Ranked causes

1. Printer out of paper (common)
2. Cartridge ribbon is dry (common)
3. Printer wire harness disconnected (occasional)
4. Printer wire harness broken or open lead (occasional)
5. Printer malfunctioning (occasional)
6. Main P.C. board malfunctioning (rare)

First check

Verify printer has paper

Test point: Paper roll compartment
Expected: Paper installed

5 more checks with pass and fail actions, 6 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Steam temperature exceeds limit during vent mode high voltage

Temperature exceeds 276.1°F (135.6°C) when system should be venting, items marked not sterile

Ranked causes

1. Filter screen in trough restricted (common)
2. Vent valve malfunctioning or lines restricted (occasional)
3. Steam temperature sensor malfunction (occasional)
4. Solid state relay shorted, constant heater power (occasional)
5. Main relay malfunctioning (rare)
6. Main PC board malfunction (rare)

First check

Inspect filter screen for obstruction

Expected: Screen clean and unobstructed

2 more checks with pass and fail actions, 6 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Steam temperature low during heatup high voltage

During Heat Up Mode steam temperature does not rise at least 5°F within 10 minutes; sterilization mode not reached by 20 minutes; items not sterile

Ranked causes

1. Steam heater malfunctioning (common)
2. Steam leakage from chamber (common)
3. Solid State Relay (SSR) malfunctioning (occasional)
4. Main Relay malfunctioning (occasional)
5. Steam Temperature sensor (RTD) malfunctioning (occasional)
6. Main P.C. Board malfunctioning (rare)

First check

Measure continuity of steam heater

Test point: Steam (Lower) heater terminals
Expected: 115 VAC heaters 10 ohms cold; 230 VAC heaters 39 ohms cold, varies by voltage
Tools: Ohmmeter

2 more checks with pass and fail actions, 6 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Auxiliary temperature fails to reach target during drying high voltage

Display shows C437: DRY MODE AUX TEMP LOW. Chamber temperature below 158°F (70°C) after 5 minutes into DRY mode.

Ranked causes

1. Door left wide open and tray rack not in position (common)
2. Solid State Relay (SSR) malfunctioning (occasional)
3. Auxiliary (upper) or Steam (lower) heater has open winding (occasional)
4. Auxiliary Temperature Sensor (RTD) malfunctioning (occasional)
5. Main P.C. Board malfunctioning (rare)

First check

Verify door position and tray rack placement

Expected: Door in partially open or closed position; tray rack positioned in chamber

4 more checks with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Dry mode pressure overlim caution

Unit displays Code C677; gauge pressure inside chamber exceeds 34.8 PSIG (240 kPa) during DRY mode; requires unplug/re-plug

Ranked causes

1. Door did not fully open; door gasket stuck (common)
2. Vent Valve malfunctioning or lines restricted (common)
3. Pressure Transducer malfunctioning (occasional)
4. Pressure Transducer out of calibration (occasional)
5. P.C. Board malfunctioning (rare)

6 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

High-limit switch open during dry mode caution

Unit displays Code C987; Steam and/or Auxiliary High Limit switch opened for at least 1/4 second during DRY mode

Ranked causes

1. Water level covering condensing coil outlet (common)
2. High Limit Switch weak, opens prematurely (common)
3. High Limit Switch opened normally from overheat (occasional)
4. Wire or connector loose or broken (occasional)
5. Insulation deteriorated (rare)

5 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

High-limit switch open during select mode caution

Unit displays Code C981; Steam and/or Auxiliary High Limit switch opened for at least 1/4 second during SELECT mode

Ranked causes

1. High Limit Switch weak, opens prematurely (common)
2. High Limit Switch opened normally from overheat (occasional)
3. Wire or connector loose or broken (occasional)
4. Insulation deteriorated (rare)
5. P.C. Board malfunctioning (rare)

5 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Pressure over limit in heatup mode caution

Chamber pressure exceeds 34.8 PSIG (240 kPa) during HEATUP mode. Error C673 displayed. Items marked not sterile.

Ranked causes

1. Air valve malfunction (common)
2. Pressure transducer malfunction (common)
3. Temperature RTD out of calibration (occasional)
4. Steam temperature sensor (RTD) malfunction (occasional)
5. P.C. board malfunction (rare)

First check

Measure RTD resistance at J5 connector on P.C. Board

Test point: J5 connector
Expected: 1090 ohms at 75°F (23°C) or 2066 ohms at 545°F (285°C), +/- 10 ohms
Tools: Multimeter (ohms setting)

5 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Steam temperature exceeds limit during dry mode high voltage

Temperature exceeds 276.1°F (135.6°C) during dry cycle when door should open

Ranked causes

1. Door stuck closed due to gasket swelling (common)
2. Steam temperature sensor malfunction (occasional)
3. Solid state relay shorted (occasional)
4. Main relay malfunction (rare)
5. Main PC board malfunction (rare)

5 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Vent mode pressure overlim caution

Unit displays Code C675; gauge pressure inside chamber exceeds 34.8 PSIG (240 kPa) during VENT mode; items not sterile; requires unplug/re-plug

Ranked causes

1. Filter screen in trough restricted (common)
2. Vent Valve malfunctioning or lines restricted (common)
3. Pressure Transducer malfunctioning (occasional)
4. Pressure Transducer out of calibration (occasional)
5. P.C. Board malfunctioning (rare)

6 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Auxiliary temperature exceeds safe limit during power-up high voltage

Display shows C470: POWER UP MODE AUX TEMP OVERLIM with UNPLUG / RE-PLUG UNIT prompt. Auxiliary temperature exceeds 568.4°F (298°C) during POWER UP mode.

Ranked causes

1. Auxiliary Temperature Sensor (RTD) malfunctioning (resistance above 2113 ohms) (common)
2. Previous malfunction causing false limit trigger (occasional)
3. Auxiliary high limit switch weak or opened prematurely (occasional)
4. P.C. Board malfunctioning (rare)

First check

Measure RTD resistance at P.C. Board J3 connector

Test point: J3 connector on P.C. Board
Expected: 75°F (23°C) = 1090 ohms; 545°F (285°C) = 2066 ohms; +/- 10 ohms, +/- 10 ohms
Tools: Multimeter

3 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Code C326 displayed

Display shows DOOR MODE, DOOR CLOSED, OPEN DOOR; door remains closed after solenoid energized or is open when code displays

Ranked causes

1. Door hanging up on door pulse solenoid latch (occasional)
2. Instrument inside chamber depressing door interlock plunger (occasional)
3. Door Switch malfunctioning (occasional)
4. PC Board malfunctioning (rare)

First check

Check position of door (open or closed); run Service Diagnostics and check door pulse solenoid operation

Test point: Door, door pulse solenoid
Expected: door opens after solenoid pulse

3 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Code C431 displayed

Display shows SELECT MODE, AUX TEMP LOW, PUSH STOP TO RESTART; auxiliary temperature has not risen to at least 212°F (100°C) in 10 minutes during SELECT/PREHEAT mode

Ranked causes

1. Door left wide open and tray rack not in position (common)
2. Water level of reservoir covering outlet of condensing coil (occasional)
3. Solid State Relay (SSR) malfunctioning (occasional)
4. Auxiliary (upper) or Steam (lower) heater has open winding (occasional)

First check

Check position of door and placement of tray rack after cycle

Test point: Door position, tray rack position
Expected: door partially open or closed; tray rack in place

3 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Fill mode pressure high caution

Unit displays Code C642 with 'Items Not Sterile' after filling begins; gauge pressure inside chamber equals or exceeds 2.18 PSIG (15 kPa)

Ranked causes

1. Air Valve does not close (common)
2. Vent Valve malfunctioning, staying open (common)
3. Atmospheric Pressure out of calibration (occasional)
4. Pressure Transducer out of calibration (occasional)

6 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Pressure over limit in fill mode caution

Chamber pressure exceeds 34.8 PSIG (240 kPa) during FILL mode. Error C672 displayed. Items marked not sterile.

Ranked causes

1. Air valve malfunction (common)
2. Pressure transducer malfunction (common)
3. Pressure transducer out of calibration (occasional)
4. P.C. board malfunction (rare)

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Pressure over limit in select mode caution

Chamber pressure exceeds 34.8 PSIG (240 kPa) during SELECT/FILL mode. Error C671 displayed. Items marked not sterile.

Ranked causes

1. Pressure transducer malfunction (common)
2. Pressure transducer out of calibration (occasional)
3. Vent valve malfunction or blocked (occasional)
4. P.C. board malfunction (rare)

First check

Check pressure transducer connector J14 ribbon cable

Test point: J14 connector on P.C. Board
Expected: connector secure
Tools: Visual inspection

1 more check with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Steam temperature exceeds limit during door open mode high voltage

Temperature exceeds 276.1°F (135.6°C) when door is open

Ranked causes

1. Steam temperature sensor malfunction (common)
2. Solid state relay shorted (occasional)
3. Main relay malfunction (occasional)
4. Main PC board malfunction (rare)

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Sterilizer has no power

Touchpad and display do not respond when pressed; no indication of operation

Ranked causes

1. Power cord not plugged in (common)
2. No power at outlet or circuit breaker tripped (common)
3. Main L1 fuse blown (occasional)
4. Transformer has open windings (occasional)

First check

Verify power cord connection

Test point: Power cord connector at sterilizer and outlet
Expected: Cord fully inserted

3 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Auxiliary temperature exceeds safe limit during select mode high voltage

Display shows C471: SELECT MODE AUX TEMP OVERLIM with UNPLUG / RE-PLUG UNIT prompt. Auxiliary temperature exceeds 568.4°F (298°C) during SELECT mode.

Ranked causes

1. Auxiliary Temperature Sensor (RTD) malfunctioning (common)
2. Solid State Relay (SSR) shorted causing constant heater power (occasional)
3. P.C. Board malfunctioning (rare)

First check

Measure RTD resistance at P.C. Board J3 connector

Test point: J3 connector on P.C. Board
Expected: 75°F (23°C) = 1090 ohms; 545°F (285°C) = 2066 ohms; +/- 10 ohms, +/- 10 ohms
Tools: Multimeter

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Auxiliary temperature high during dry high voltage

Auxiliary temperature exceeds 568.4°F (298°C) during DRY mode; items may not be sterile

Ranked causes

1. Auxiliary Temperature Sensor (RTD) malfunctioning (common)
2. Main Relay malfunctioning (occasional)
3. SSR shorted causing constant heater power (occasional)

First check

Measure Auxiliary RTD resistance

Test point: J3 connector
Expected: 75°F = 1090 ohms +/- 10; 545°F = 2066 ohms +/- 10, +/- 10%
Tools: Ohmmeter

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Auxiliary temperature high during vent or heatup (C47X codes) high voltage

Auxiliary temperature exceeds 568.4°F (298°C) during VENT mode or HEATUP mode; items may not be sterile

Ranked causes

1. Auxiliary Temperature Sensor (RTD) malfunctioning (common)
2. SSR shorted causing constant heater power (occasional)
3. Main P.C. Board malfunctioning (rare)

First check

Measure Auxiliary RTD resistance

Test point: J3 connector
Expected: 75°F = 1090 ohms +/- 10; 545°F = 2066 ohms +/- 10, +/- 10 ohms
Tools: Ohmmeter

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Auxiliary temperature sensor hardware error during drying caution

Display shows C467: DRY MODE AUX TEMP HARDWARE. A/D converter reports value outside normal limits during DRY mode.

Ranked causes

1. Auxiliary Temperature Sensor (RTD) unplugged from P.C. Board (common)
2. Auxiliary Temperature Sensor (RTD) malfunctioning (occasional)
3. Main P.C. Board malfunctioning (rare)

First check

Inspect Auxiliary RTD plug condition and security at P.C. Board

Test point: J3 connector on P.C. Board
Expected: Connector seated securely; no corrosion or damage

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Auxiliary temperature sensor hardware error during select mode caution

Display shows C461: SELECT MODE AUX TEMP HARDWARE. A/D converter reports value outside normal limits during SELECT mode (occurs during warm start/back-to-back cycles).

Ranked causes

1. Auxiliary Temperature Sensor (RTD) unplugged from P.C. Board (common)
2. Auxiliary Temperature Sensor (RTD) malfunctioning (occasional)
3. Main P.C. Board malfunctioning (rare)

First check

Inspect Auxiliary RTD plug condition and security at P.C. Board

Test point: J3 connector on P.C. Board
Expected: Connector seated securely; no corrosion or damage

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Steam temperature hardware error high voltage

Steam A/D converter reports value outside normal limits during startup or mode operation

Ranked causes

1. Steam RTD unplugged from P.C. Board (common)
2. Steam RTD malfunctioning (occasional)
3. Main P.C. Board malfunctioning (rare)

First check

Verify Steam RTD connector is seated at J5

Test point: J5 pin connector on P.C. Board
Expected: Connector fully seated and secure
Tools: Visual inspection

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Steam temperature high during sterilization high voltage

During Sterilization Mode chamber temperature increases 6°F or more above cycle's designated sterilization temperature; items may not be sterile

Ranked causes

1. Water dissipated or leaked through Vent or Fill Valve (common)
2. Steam Temperature sensor (RTD) malfunctioning (occasional)
3. Main P.C. Board malfunctioning (rare)

First check

Compare STEAM temp with probe reading during Service Diagnostics

Test point: Chamber interior with calibrated probe
Expected: STEAM sensor reading matches calibrated probe reading
Tools: Calibrated temperature probe, Service Diagnostics

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Vent mode pressure high caution

Unit displays Code C645 with 'Items Not Sterile'; absolute pressure inside chamber greater than 0.73 PSIG (5 kPa) for longer than 5 minutes

Ranked causes

1. Vent Valve malfunctioning, staying open (common)
2. Pressure Transducer malfunctioning (common)
3. Main P.C. Board malfunctioning (occasional)

First check

Check Vent Valve operation and leakage

Test point: Vent Valve
Expected: No leakage when closed
Tools: Service Diagnostics tool

1 more check with pass and fail actions, 6 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Auxiliary temperature fails to reach target during preheat caution

Display shows C431: SELECT MODE AUX TEMP LOW. Trough temperature has not risen to 212°F (100°C) in 10 minutes while unit is in SELECT/PREHEAT mode.

Ranked causes

1. Auxiliary Temperature Sensor (RTD) malfunctioning (common)
2. Main P.C. Board malfunctioning (occasional)

First check

Run Service Diagnostics and compare temperature readings

Expected: STEAM and AUX temperature readings within normal range and in line with each other

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Auxiliary temperature high during fill high voltage

Auxiliary temperature exceeds 568.4°F (298°C) during FILL mode; items may not be sterile

Ranked causes

1. Auxiliary Temperature Sensor (RTD) malfunctioning (common)
2. Main P.C. Board malfunctioning (rare)

First check

Measure Auxiliary RTD resistance

Test point: J3 connector on P.C. Board
Expected: 75°F = 1090 ohms +/- 10; 545°F = 2066 ohms +/- 10, +/- 10 ohms
Tools: Ohmmeter

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Code C382 displayed

Display shows FILL MODE, DOOR OPEN, ITEMS NOT STERILE, CLOSE DOOR; door opened during Fill Mode

Ranked causes

1. Operator opened door during Fill Mode (common)
2. Door Switch malfunctioning (occasional)

First check

Check with person operating unit to see if door was opened during Fill Mode

Test point: Operator action
Expected: door remained closed during Fill Mode

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Code C383 displayed

Display shows HEATUP MODE, DOOR OPEN, ITEMS NOT STERILE, PUSH STOP TO RESTART; door opened during Heatup Mode

Ranked causes

1. Operator opened door during Heatup Mode (common)
2. Door Switch malfunctioning (occasional)

First check

Check with person operating unit to see if door was opened during Heatup

Test point: Operator action
Expected: door remained closed during Heatup

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Code C385 displayed

Display shows VENT MODE, DOOR OPEN, ITEMS NOT STERILE, PUSH STOP TO RESTART; door opened during Vent Mode

Ranked causes

1. Operator opened door during Vent Mode (common)
2. Door Switch malfunctioning (occasional)

First check

Check with person operating unit to see if door was opened during Vent

Test point: Operator action
Expected: door remained closed during Vent

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

No Display with touchpad working

Display is blank or shows undefined characters with intermittent beep; touchpad responds but display does not function

Ranked causes

1. Ribbon cable from J2 to touchpad disconnected (common)
2. J2 ribbon cable has open lead (occasional)

First check

Inspect J2 connector condition

Test point: J2 Plug connection
Expected: Connector fully seated with pins aligned

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Code C010 displayed

Display shows POWER UP MODE, SYSTEM PWR LOSS, ITEMS NOT STERILE, PUSH STOP TO RESTART

Ranked causes

1. Unit lost power during Fill, Heat Up, or Sterilization Mode (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Code C060 displayed

Display shows POWER UP MODE, SYSTEM HARDWARE, ITEMS NOT STERILE, UNPLUG/RE-PLUG UNIT

Ranked causes

1. Internal glitch from brief power interruption affecting PC Board components (occasional)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Code C102 displayed

Display shows FILL MODE, STOP PRESSED, ITEMS NOT STERILE, PUSH STOP TO RESTART

Ranked causes

1. Operator pressed STOP button during Fill Mode (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Code C384 displayed patient safety

Display shows STERILIZE MODE, DOOR OPEN, ITEMS NOT STERILE, UNPLUG/RE-PLUG UNIT; door opened during Sterilize Mode

Ranked causes

1. Door Switch malfunctioning (common)

First check

Check Door Switch contact is closed when door is in closed position

Test point: Door Switch contact
Expected: closed when door is closed
Tools: continuity meter

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Door interlock plunger sticks or does not operate freely patient safety

Door interlock plunger does not spring back readily when depressed, may be stuck

Ranked causes

1. Door interlock plunger contamination or lack of lubrication (common)

First check

Depress door interlock plunger and observe if it operates freely

Test point: Door interlock plunger
Expected: Plunger depresses and springs back freely

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Pressure relief valve does not close properly patient safety

Valve remains open or will not seal completely when pressure relief tab is released during sterilizing cycle

Ranked causes

1. Pressure relief valve seat leakage or internal damage (common)

First check

Run UNWRAPPED cycle and lift relief tab at STERILIZING

Test point: Pressure relief tab (2)
Expected: Valve opens easily and steam vents

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Pressure relief valve requires excessive force to open caution

High force required when lifting pressure relief tab during sterilizing cycle; indicates valve stiction or blockage

Ranked causes

1. Pressure relief valve internal blockage or wear (common)

First check

Select UNWRAPPED cycle and press START

Test point: Control display
Expected: Cycle initiates

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Steam temperature exceeds upper limit high voltage

Steam temperature exceeds 276.1°F (135.6°C) during Power Up mode

Ranked causes

1. Previous malfunction or power interruption (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Tray rack installed backwards or incorrectly patient safety

Tray rack positioned backwards in chamber, may cause water level sensor grounding issue

Ranked causes

1. Tray rack installed backwards in chamber (occasional)

First check

Verify tray rack front is facing toward front of chamber

Test point: Tray rack orientation in chamber
Expected: Tray rack front positioned toward sterilizer front

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unit will not fill

Display shows CHAMBER VENTING BEFORE FILL; unit fails to fill chamber with water

Ranked causes

1. Atmospheric pressure setting out of calibration (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Error codes

Code	Meaning	Trigger	Severity
`C010`	POWER UP MODE, SYSTEM PWR LOSS	Unit lost power for a few seconds during Fill, Heat Up, or Sterilization Mode	warning
`C060`	POWER UP MODE, SYSTEM HARDWARE	An error that occurred in Fill, Heatup, Sterilization or Vent modes was not properly cleared before unit was unplugged and replugged	error
`C102`	FILL MODE, STOP PRESSED	Operator pressed STOP button during Fill Mode	info
`C103`	HEATUP MODE, STOP PRESSED	Operator pressed STOP button during Heatup Mode	info
`C104`	STERILIZE MODE, STOP PRESSED	Operator pressed STOP button during Sterilize Mode	info
`C105`	VENT MODE, STOP PRESSED	Operator pressed STOP button during Vent Mode	info
`C106`	DOOR MODE, STOP PRESSED	Operator pressed STOP button during Door Mode	info
`C232`	FILL MODE, WATER LOW	Water fill sensor did not detect water level within 2 minutes after door closed or chamber vented	warning
`C326`	DOOR MODE, DOOR CLOSED	Door remains closed one second after door pulse solenoid energized, or door is open but code displays	error
`C382`	FILL MODE, DOOR OPEN	Door Switch contacts opened during Fill Mode	warning
`C383`	HEATUP MODE, DOOR OPEN	Door Switch contacts opened during Heatup Mode	warning
`C384`	STERILIZE MODE, DOOR OPEN	Door Switch contacts opened during Sterilize Mode	critical
`C385`	VENT MODE, DOOR OPEN	Door Switch contacts opened during Vent Mode	warning
`C431`	SELECT MODE, AUX TEMP LOW	Auxiliary temperature (trough) has not risen to at least 212°F (100°C) in 10 minutes during SELECT/PREHEAT mode	warning
`C431`	Auxiliary temperature does not reach 212°F (100°C) in 10 minutes during SELECT/PREHEAT mode	Unit in SELECT/PREHEAT mode; auxiliary temp not reaching 212°F within time limit	warning
`C437`	Auxiliary temperature below 158°F (70°C) after 5 minutes in DRY mode	Unit in DRY mode; auxiliary temp not reaching 158°F within 5 minutes	warning
`C461`	Auxiliary A/D converter reports value outside normal limits during SELECT mode (warm start)	Back-to-back cycles in SELECT mode; A/D converter reading exceeds acceptable range	warning
`C467`	Auxiliary A/D converter reports value outside normal limits during DRY mode	DRY mode operation; A/D converter reading exceeds acceptable range	warning
`C470`	Auxiliary temperature exceeds 568.4°F (298°C) during POWER UP mode	POWER UP mode; auxiliary temperature exceeds safe maximum threshold	critical
`C471`	Auxiliary temperature exceeds 568.4°F (298°C) during SELECT mode	SELECT mode operation; auxiliary temperature exceeds safe maximum threshold	critical
`C472`	Fill Mode - Auxiliary temperature exceeds upper limit	Auxiliary temperature exceeds 568.4°F (298°C) during FILL mode	critical
`C473`	Heatup Mode - Auxiliary temperature exceeds upper limit	Auxiliary temperature exceeds 568.4°F (298°C) during HEATUP mode	critical
`C474`	Sterilize Mode - Auxiliary temperature exceeds upper limit	Auxiliary temperature exceeds 568.4°F (298°C) during STERILIZE mode	critical
`C475`	Vent Mode - Auxiliary temperature exceeds upper limit	Auxiliary temperature exceeds 568.4°F (298°C) during VENT mode	critical
`C476`	Heatup Mode - Auxiliary temperature exceeds upper limit (C47X series)	Auxiliary temperature exceeds 568.4°F (298°C) during HEATUP mode	critical
`C477`	Dry Mode - Auxiliary temperature exceeds upper limit	Auxiliary temperature exceeds 568.4°F (298°C) during DRY mode	critical
`C533`	Heatup Mode - Steam temperature low	During Heat Up Mode steam temperature does not rise at least 5°F within 10 minutes	critical
`C544`	Sterilize Mode - Steam temperature high	Chamber temperature increases 6°F or more above designated sterilization temperature	critical
`C554`	Sterilize Mode - Steam temperature regulation issue	For second time during sterilization (first time unit restarts), poor temperature/pressure regulation	critical
`C560`	Power Up Mode - Steam temperature hardware error	Steam A/D converter reports value outside normal limits during Power Up	critical
`C561`	Select Mode - Steam temperature hardware error	Steam A/D converter reports value outside normal limits during Select mode	critical
`C562`	Fill Mode - Steam temperature hardware error	Steam A/D converter reports value outside normal limits during Fill mode	critical
`C563`	Heatup Mode - Steam temperature hardware error	Steam A/D converter reports value outside normal limits during Heatup mode	critical
`C564`	Sterilize Mode - Steam temperature hardware error	Steam A/D converter reports value outside normal limits during Sterilize mode	critical
`C565`	Vent Mode - Steam temperature hardware error	Steam A/D converter reports value outside normal limits during Vent mode	critical
`C566`	Door Mode - Steam temperature hardware error	Steam A/D converter reports value outside normal limits during Door mode	critical
`C567`	Dry Mode - Steam temperature hardware error	Steam A/D converter reports value outside normal limits during Dry mode	critical
`C570`	Power Up Mode - Steam temperature exceeds upper limit	Steam temperature exceeds 276.1°F (135.6°C) during Power Up mode	critical
`C573`	Heat-up mode - steam temperature over limit	Steam temperature exceeds 276.1°F (135.6°C) during HEAT UP mode	critical
`C574`	Sterilize mode - steam temperature over limit	Steam temperature exceeds 276.1°F (135.6°C) during STERILIZE mode	critical
`C575`	Vent Mode Steam Temperature Over Limit	Steam temperature exceeds 276.1°F (135.6°C) during VENT mode	critical
`C576`	Door Mode Steam Temperature Over Limit	Steam temperature exceeds 276.1°F (135.6°C) during DOOR OPEN mode	critical
`C577`	Dry Mode Steam Temperature Over Limit	Steam temperature exceeds 276.1°F (135.6°C) during DRY OPEN mode	critical
`C633`	Heat-Up Mode Pressure Low	Chamber pressure fails to reach 1 psig in 1 minute or 4.93 psig in 16 minutes after air valve closes	critical
`C642`	Fill Mode Pressure High; Items Not Sterile	After filling begins, gauge pressure inside chamber equals or exceeds 2.18 PSIG (15 kPa)	warning
`C645`	Vent Mode Pressure High; Items Not Sterile	Absolute pressure inside chamber exceeds 0.73 PSIG (5 kPa) for longer than 5 minutes	warning
`C647`	Dry Mode Pressure High	Gauge pressure inside chamber equals or exceeds 2.18 PSIG (15 kPa) during DRY mode	warning
`C660`	Power Up Mode Pressure Hardware	Pressure A/D converter reports average value outside limits for normal operation during POWER UP mode	critical
`C661`	Select Mode Pressure Hardware	Pressure A/D converter reports average value outside limits during SELECT mode	critical
`C662`	Fill Mode Pressure Hardware	Pressure A/D converter reports average value outside limits during FILL mode	critical
`C663`	Heatup Mode Pressure Hardware	Pressure A/D converter reports average value outside limits during HEATUP mode	critical
`C664`	Sterilize Mode Pressure Hardware	Pressure A/D converter reports average value outside limits during STERILIZE mode	critical
`C665`	Vent Mode Pressure Hardware	Pressure A/D converter reports average value outside limits during VENT mode	critical
`C666`	Door Mode Pressure Hardware	Pressure A/D converter reports average value outside limits during DOOR mode	critical
`C667`	Dry Mode Pressure Hardware	Pressure A/D converter reports average value outside limits during DRY mode	critical
`C670`	Power Up Mode Pressure Overlim	Gauge pressure inside chamber exceeds 34.8 PSIG (240 kPa) during POWER UP mode	critical
`C671`	SELECT MODE pressure over limit	Chamber pressure exceeds 34.8 PSIG (240 kPa) during SELECT/FILL mode	error
`C672`	FILL MODE pressure over limit	Chamber pressure exceeds 34.8 PSIG (240 kPa) during FILL mode	error
`C673`	HEATUP MODE pressure over limit	Chamber pressure exceeds 34.8 PSIG (240 kPa) during HEATUP mode	error
`C674`	STERILIZE MODE pressure over limit	Chamber pressure exceeds 34.8 PSIG (240 kPa) during STERILIZE mode	error
`C675`	Vent Mode Pressure Overlim; Items Not Sterile	Gauge pressure inside chamber exceeds 34.8 PSIG (240 kPa) during VENT mode	critical
`C676`	Door Mode Pressure Overlim; Items Not Sterile	Gauge pressure inside chamber exceeds 34.8 PSIG (240 kPa) during DOOR mode	critical
`C677`	Dry Mode Pressure Overlim	Gauge pressure inside chamber exceeds 34.8 PSIG (240 kPa) during DRY mode	critical
`C980`	Power Up Mode High Limit Open	Steam and/or Auxiliary High Limit switch opened for at least 1/4 second during POWER UP mode	critical
`C981`	Select Mode High Limit Open	Steam and/or Auxiliary High Limit switch opened for at least 1/4 second during SELECT mode	critical
`C982`	Fill Mode High Limit Open	Steam and/or Auxiliary High Limit switch opened for at least 1/4 second during FILL mode	critical
`C983`	Heatup Mode High Limit Open	Steam and/or Auxiliary High Limit switch opened for at least 1/4 second during HEATUP mode	critical
`C984`	Sterilize Mode High Limit Open	Steam and/or Auxiliary High Limit switch opened for at least 1/4 second during STERILIZE mode	critical
`C985`	Vent Mode High Limit Open	Steam and/or Auxiliary High Limit switch opened for at least 1/4 second during VENT mode	critical
`C986`	Door Mode High Limit Open	Steam and/or Auxiliary High Limit switch opened for at least 1/4 second during DOOR mode	critical
`C987`	Dry Mode High-Limit Open	Steam and/or Aux. High Limit switch opened for at least 1/4 second during DRY mode	critical
`PERFORM MONTHLY MAINTENANCE`	Monthly maintenance reminder	Cycle count reaches a multiple of 160	info
`PERFORM WEEKLY MAINTENANCE`	Weekly maintenance reminder	Cycle count reaches a multiple of 40	info

Likely causes and actions for each code are in ServiceForge. Connect ServiceForge to your AI

Community

0 fixes logged by technicians through their AI, with outcomes, for this model.

ServiceForge knowledge base record. Field-unverified unless technicians confirmed it. A teaching summary of the record, not a service manual. Export 2026-10-14.