Electrosurgical generators

ConMed System 5000: troubleshooting and error codes

The ServiceForge knowledge base holds 25 documented symptoms for the ConMed System 5000, with 45 ranked causes, 65 diagnostic checks with test points and expected values, and 88 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

No output power high voltage

System does not produce RF output power when activated

Ranked causes

1. Internal connections bad (common)
2. Faulty accessory with blade not fully seated (occasional)
3. Output board jacks not making contact (occasional)
4. Low voltage power supply bad (occasional)
5. Shorted RF Amplifier MOSFET (occasional)
6. HVPS output too low (occasional)
7. Improper gate drive (occasional)

First check

Verify internal connector seating

Test point: A6J1, A6J2, A6J3, A6J4, A7J1, A7J2 connectors
Expected: All connectors fully seated

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

Display panel blank when powered on

No display visible when system is turned on

Ranked causes

1. Power cord not fully seated (common)
2. Fuses blown or improperly installed (common)
3. Controller board or harness not seated (occasional)
4. Low voltage power supply failure (occasional)

First check

Verify power cord connection

Test point: Power receptacle on back panel
Expected: Fully seated

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

Dispersive electrode status indicators flashing alternating red patient safety

Single or dual dispersive electrode alarm LEDs flashing red alternately

Ranked causes

1. Dispersive electrode not connected (common)
2. Dual dispersive electrode not properly applied to patient (common)
3. Dispersive electrode connector not fully seated (occasional)

First check

Verify dispersive electrode connection

Test point: Dispersive Electrode Receptacle
Expected: Electrode connected and seated

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

Display shows A[[ [P xx (control panel error)

Control panel error code displayed on screen

Ranked causes

1. Faulty push button on front control panel (occasional)
2. Push button pressed during power-on (occasional)
3. Faulty cable connection between front panel and display board (occasional)

First check

Verify no buttons pressed during power-on

Test point: Control panel buttons
Expected: No buttons actuated

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

Display shows A[[ xxx (accessory error)

Faulty accessory error code displayed on screen

Ranked causes

1. Faulty accessory connected (common)
2. Hand-controlled accessory erroneously actuated (occasional)
3. Footswitch erroneously actuated (occasional)

First check

Verify no footswitches are stacked

Test point: Monopolar and Bipolar footswitch connectors
Expected: Footswitches not stacked

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

Incorrect bipolar output

Bipolar output power does not match set value or expected output

Ranked causes

1. Bad calibration (common)
2. Incorrect load resistor when checking output (occasional)
3. Bad voltage or current feedback (occasional)

First check

Perform bipolar output calibration

Test point: Bipolar output with calibrated load resistor
Expected: Output matches calibration targets per procedure

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

Incorrect monopolar output

Monopolar output power does not match set value or expected output

Ranked causes

1. Bad calibration (common)
2. Incorrect load resistor when checking output (occasional)
3. Bad voltage or current feedback (occasional)

First check

Perform monopolar output calibration

Test point: Monopolar output with calibrated load resistor
Expected: Output matches calibration targets per procedure

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

Real Time Clock battery voltage low or not charged

Date defaults to 01 01 01 or time defaults to 12P 0 1, indicating Real Time Clock battery insufficient

Ranked causes

1. Real Time Clock battery voltage below 2V (common)
2. Real Time Clock battery not charged from previous service (occasional)

First check

Verify date and time display

Test point: Display panel (Last Fault Code Mode)
Expected: Date shows actual month-day-year; time shows actual hours-minutes-seconds

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

A.R.M. dual electrode lower limit out of range patient safety

A.R.M. does not show green flashing with eight bargraph bars at lower resistance limit

Ranked causes

1. A.R.M. circuit calibration error or component fault (unknown)

First check

Verify A.R.M. dual electrode lower limit indicator and bargraph response

Test point: Dual Dispersive Electrode Status/Alarm Indicator and Bargraph
Expected: Flashing green with eight bars illuminated Ohms
Tools: Decade Resistance Box

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

A.R.M. dual electrode upper limit out of range patient safety

A.R.M. does not show green flashing with single bargraph bar at upper resistance limit

Ranked causes

1. A.R.M. circuit calibration error or component fault (unknown)

First check

Verify A.R.M. dual electrode upper limit indicator and bargraph response

Test point: Dual Dispersive Electrode Status/Alarm Indicator and Bargraph
Expected: Flashing green with one bar illuminated Ohms
Tools: Decade Resistance Box

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

A.R.M. single electrode upper limit out of range patient safety

A.R.M. does not show steady green indicator without flashing at upper resistance limit

Ranked causes

1. A.R.M. circuit calibration error or component fault (unknown)

First check

Verify A.R.M. single electrode upper limit indicator response

Test point: Single Dispersive Electrode Status/Alarm Indicator
Expected: Green and not flashing Ohms
Tools: Decade Resistance Box

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

Automatic Return Monitor (A.R.M.) dual electrode alarm limit out of range patient safety

A.R.M. does not flash red in alternating fashion when dispersive electrode resistance is at alarm threshold

Ranked causes

1. A.R.M. circuit calibration drift or component failure (unknown)

First check

Verify A.R.M. dual electrode alarm limit indicator response

Test point: Single and Dual Dispersive Electrode Status/Alarm Indicators
Expected: Red alternating flash Ohms
Tools: Decade Resistance Box, dispersive electrode cable adapter

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

Calibration: A.R.M.™ Dispersive Electrode connection high voltage

Calibrate Automatic Return Electrode Monitoring against two known precision resistances

Ranked causes

1. A.R.M.™ requires calibration with paired resistances (common)

First check

Initiate A.R.M.™ calibration

Test point: Remote Power Control Key
Expected: Resistance value appears in Monopolar Coag Power Digital Display

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

Calibration: Bipolar modes high voltage

Calibrate Bipolar Macro mode using measured current or power against a precision resistor

Ranked causes

1. Bipolar mode requires power calibration adjustment (common)

First check

Select calibration units (current or power)

Test point: Bipolar Power Adjustment Keys
Expected: A for current or P for power

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

Calibration: Complete and exit calibration mode caution

Exit calibration mode and prepare ESU for normal operation

Ranked causes

1. Calibration must be completed before normal operation (common)

First check

Turn off main power

Test point: Main power switch
Expected: Power indicator extinguished

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

Calibration: Monopolar modes high voltage

Adjust Monopolar Cut, Blend, Pinpoint Coag, Standard Coag, and Spray Coag modes using measured current or power against a precision resistor

Ranked causes

1. Mode requires power calibration adjustment (common)

First check

Select calibration units (current or power)

Test point: Bipolar Power Adjustment Keys
Expected: A for current or P for power

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

Calibration: System 5000 monopolar and bipolar output power

Verify and adjust output power calibration for Cut, Coag, Blend modes and Bipolar to match target values using load resistance and meter

Ranked causes

1. Calibration drift after component replacement or repair (common)

First check

Set calibration system configuration DIP switch

Test point: Controller board A4SW2.2 and A4SW2.1
Expected: A4SW2.2 ON (UP), A4SW2.1 OFF (DOWN)

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

Display shows [al (calibration mode)

Calibration mode is displayed on screen

Ranked causes

1. DIP switch 2 set to ON and Remote Power Control Key pressed during power-on (common)

First check

Verify DIP switch 2 position

Test point: Controller assembly DIP switch position 2
Expected: OFF position for normal operation

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

Display shows Err xxx (error code)

Error code is displayed on screen indicating a system fault

Ranked causes

1. System fault detected during POST or operation (unknown)

First check

Attempt system reset via power cycle

Test point: Main power switch
Expected: Error clears or POST identifies fault

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

Display shows LF[ xxx (last fault code mode)

Last fault code mode is displayed instead of normal operation

Ranked causes

1. Remote Power Control Key pressed during power initialization (common)

First check

Power cycle system without pressing buttons

Test point: Main power switch
Expected: Normal operation display

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

Error 140: Calibration memory error

Stored calibration values are corrupted or inaccessible, affecting output power accuracy

Ranked causes

1. Calibration memory corruption or Controller board failure (rare)

First check

Verify Err 140 display

Test point: Monopolar Cut Power Digital Display
Expected: Err 140

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

Error 143: Mode calibration required

One or more operating modes require calibration after board replacement or calibration drift detected

Ranked causes

1. Board replacement (Controller, Transformer, or Output) or calibration drift (common)

First check

Verify Err 143 display and affected modes

Test point: Monopolar Cut Power Digital Display and mode indicators
Expected: nEr with flashing minor mode indicators for modes requiring calibration

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

Flashing decimal points on display

Decimal point indicators on display are flashing

Ranked causes

1. Test Mode is active (common)

First check

Verify DIP switch 1 position

Test point: Controller assembly DIP switch position 1
Expected: OFF position for normal operation

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

Leakage current out of specification high voltage

Active RF output to neutral exceeds allowable limit during monopolar operation with footswitch or hand control activation

Ranked causes

1. Faulty monopolar active output relay or circuit (unknown)

First check

Measure leakage current from footswitched monopolar active output to neutral with normal line/GND

Test point: Active output terminal to neutral
Expected: ≤15 μA, max
Tools: Leakage current meter, footswitch

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

Output coupling capacitor out of specification caution

Capacitance measured at output coupling does not meet expected values for monopolar or bipolar modes

Ranked causes

1. Faulty output coupling capacitor or circuit component (unknown)

First check

Measure baseline output coupling capacitance without activation

Test point: Shorting plug adapter to footswitched ReadiPlug Universal Accessory Receptacle
Expected: <0.5 nF, max
Tools: Capacitance meter (≤1 kHz), shorting plug adapter, ≤6" test leads

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

Error codes

Code	Meaning	Trigger	Severity
`100`	Test or CAL mode dip switch with no remote power control key press	Remote Power Control Key not depressed during power initialization or not released before last tone sounds	error
`101`	Controller/Monitor DIP switch mismatch	System Controller and Monitor detect different Configuration Dipswitch settings	error
`102`	Corrupted communications between System Controller and Monitor	Faulty data transmission from System Controller to Monitor through HPI port	error
`103`	Corrupted communications between System Controller and RF Controller	Faulty data transmission from System Controller to RF Controller through HPI port	error
`104`	Monitor TOKEN not incremented, monitor program scrambled	Faulty data transmitted from System Controller to Monitor through HPI port	error
`105`	Controller failed RAM test	Memory errors detected during POST	error
`106`	RF controller bootload program does not match controller ROM table	Faulty program transmission from System Controller to RF Controller at startup	error
`107`	Monitor bootload program does not match controller ROM table	Faulty program transmission from System Controller to Monitor at startup	error
`108`	RF TOKEN not incremented, RF controller program scrambled	Faulty or corrupted program transmission from System Controller to RF Controller at startup	error
`109`	Communications lost during POST tests	Faulty communications through HPI port	error
`112`	Pre-activation handshake, monitor does not read an activation signal	Activation signals detected by System Controller and Monitor do not match	error
`113`	Pre-activation handshake, monitor does not read a tone signal	Activation tone not present when Monitor checks prior to enabling electrosurgical output	error
`114`	Display or keyboard SPI communication failure	Communication failure between Control assembly and Display assembly over SPI bus	error
`117`	5.0 volt too low	5-volt power supply voltage drops below specification	error
`118`	5.0 volt too high	5-volt power supply voltage exceeds specification	error
`122`	System Controller flash program CRC does not match calculated CRC	Self-check CRC for System Controller not internally consistent	error
`135`	A.R.M. calibration (10/150 Ohm) EEPROM CRC failed	CRC for calibration coefficient memory not self consistent	error
`136`	A.R.M. circuit dropped below 0.4V (circuit failed)	A.R.M. circuit voltage falls below 0.4V	error
`137`	RF controller calibration EEPROM CRC failed	CRC for RF controller calibration coefficient memory not self consistent	error
`138`	Monitor calibration EEPROM CRC failed	CRC for Monitor calibration coefficient memory not self consistent	error
`139`	During calibration, not all points were entered for the mode	Calibration not completed in correct manner	warning
`140`	A calibration EEPROM CRC failed (POST ERROR)	CRC for calibration coefficient memory not self consistent during POST	error
`141`	Test and CAL dip switches are both turned on	Calibration and Test Configuration Dipswitches both in ON position	error
`142`	RF PWM (RF_PROT) gate protection circuit shutdown	Pulse width commanded by RF Controller exceeds maximum allowed for selected mode	error
`143`	Unit or a mode was never calibrated	System or mode never calibrated or Controller replaced without calibration	warning
`144`	RF controller and Monitor power levels do not match	Monitor and RF Controller sense different electrosurgical output power during activation	error
`170`	Controller waveform inhibit failed (will not disable RF) (POST ERROR)	Monitor detects that System Controller cannot disable RF Drive signal during POST	critical
`200`	Modality function timed out while waiting for ADC DMAs to finish	Component failure preventing ADC DMA operations from completing	error
`201`	RF Controller emulation restart	Programming function restart	info
`202`	Inter-processor communications error	Controller Assembly Host Port communication failure	error
`204`	Processor system clock change failed	Microprocessor clock frequencies do not change to correct frequency after initialization	error
`205`	Halt mode active beyond limit	Halt mode operation exceeds time limit	error
`206`	RF Controller discovered runtime bad CRC	Errors found in software downloaded from System Controller to RF Controller during initialization	error
`207`	Unexpected mode change while active	Selected output mode changes while system is activated	error
`236`	Bad CRC on modality coefficients	Modality coefficient CRC check failure	error
`237`	POST memory failure	Errors found in microprocessor memories during power initialization	error
`239`	RF Controller rejected a calibration value	Calibration failed for one or more modes	error
`311`	POST Monitor memory failure	Errors found in Monitor microprocessor memory during power initialization	error
`314`	POST Monitor or RF controller clock failure	RF Controller or Monitor clock oscillator failure detected during POST	error
`315`	POST Monitor activation circuitry failure	Activation request signal states do not match between Monitor and System Controller	error
`320`	Monitor failed program CRC test	Errors found in software downloaded from System Controller to Monitor during initialization	error
`321`	Monitor failed calibration data CRC test	Monitor calibration data CRC check failure	error
`322`	Monitor or RF controller did not return to IDLE state	Activation continues after activation command ceases	error
`330`	POST RF AC voltage cut feedback too low (A/D channel 0)	Monitor senses electrosurgical voltage output too low during POST test	error
`331`	POST RF AC voltage cut feedback too high (A/D channel 0)	Monitor senses electrosurgical voltage output too high during POST test	error
`332`	POST RF AC voltage coag feedback too low (A/D channel 2)	Monitor senses electrosurgical voltage output too low during POST test	error
`333`	POST RF AC voltage coag feedback too high (A/D channel 2)	Monitor senses electrosurgical voltage output too high during POST test	error
`334`	POST RF AC voltage coag feedback too low (A/D channel 1)	Monitor senses electrosurgical voltage output too low during POST test	error
`335`	POST RF AC voltage coag feedback too high (A/D channel 1)	Monitor senses electrosurgical voltage output too high during POST test	error
`336`	Calibration RF AC voltage cut feedback too high	Monitor senses electrosurgical voltage output too high during POST test	error
`337`	Calibration RF AC voltage cut feedback too low	Monitor senses electrosurgical voltage output too low during POST test	error
`338`	Calibration RF AC voltage coag feedback too high	Monitor senses electrosurgical voltage output too high during POST test	error
`339`	Calibration RF AC voltage coag feedback too low	Monitor senses electrosurgical voltage output too low during POST test	error
`340`	Monitor Timer0 interrupt failed	Internal timer failure during operation	critical
`341`	Monitor Timer0 interrupt failed POST	Internal timer failure detected during POST	critical
`342`	Monitor Timer1 interrupt failed POST	Internal timer failure detected during POST	critical
`343`	Monitor has lost communications - controller TOKENS not incremented	Loss of communication between Monitor and Controller	critical
`344`	Monitor Isense DMA or SPI hung	Monitor DMA or SPI interface failure	critical
`345`	Monitor Power DMA or SPI hung	Monitor DMA or SPI interface failure	critical
`350`	Monitor output channel current sensor failure	Current mismatch between output channel and power monitoring sensors	error
`351`	Monitor sensed over power condition for 300mS running average	Over power at electrosurgical output persists for more than 300 ms	error
`352`	Monitor sensed 4x over power condition for short period	Excessive power at electrosurgical output detected briefly	error
`357`	Monitor sensed power @ 0W dial power setting	Monitor detects electrosurgical output power during activation at zero power dial setting	error
`358`	Monitor sensed gate drive in idle @ 0W dial power setting	Drive signal detected while system is not activated	warning
`359`	Monitor sensed peak voltages above the LAP Limit	Voltage peaks exceed limits in Lap Advanced Specialty mode	error
`360`	Monitor program counter landed on an unused interrupt vector	Monitor processor anomaly	critical
`371`	Monitor will not disable RF waveform on the Controller assembly during POST	Monitor cannot disable RF waveform during POST	critical
`372`	Monitor will not disable high voltage during POST	Monitor cannot disable HVPS during POST	critical
`373`	Damping circuit failed POST – damping not detected	Damping drive signal failure detected during POST	error
`374`	Damping circuit failed POST – damping stuck on	Damping drive signal stuck on during POST, no RF output	critical
`379`	RF calibration failed POST	System calibration failure during POST	error
`381`	No tone feedback during POST	Monitor did not detect tones during POST	warning
`382`	Activation without a tone	Monitor did not detect a tone during activation	warning
`383`	RF Current sensed at an unselected output	Current flowing at an output that has not been selected	error
`384`	POST HVDC to 30V failed - supply too low	HVPS output is too low during Power-On Self Test	error
`385`	POST HVDC to 30V failed - supply too high	HVPS output is too high during Power-On Self Test	error
`386`	POST HVDC to 140V failed - supply too low	HVPS output is too low at 140V setting during POST	error
`387`	POST HVDC to 140V failed - supply too high	HVPS output is too high at 140V setting during POST	error
`388`	POST monitor timed out - did not respond to POST command	Monitor did not respond to Power-On Self Test command within timeout period	error
`389`	Dial setting over maximum limit	Front panel power setting exceeds limit for selected mode	warning
`391`	Monitor detected the wrong RF waveform	Monitor detected improper RF Amplifier drive waveform or frequency for selected mode	error
`392`	Monitor detected a pulse mode on-time that was too long	Active pulse mode pulses exceed nominal duration limits	warning
`393`	Vbias signal too high	Reference voltage on one or more ADC channels on Controller exceeds nominal	error
`394`	Vbias signal too low	Reference voltage on one or more ADC channels on Controller below nominal	error
`A[[ xxx`	Accessory error code	Faulty accessory connected, hand-controlled accessory erroneously actuated, or footswitch erroneously actuated	error
`Err 100`	Error 100 fault code	Displayed when DIP switch 1 or 2 is ON and Remote Power Control Key is not pressed until Test Tone begins	error
`Err 140`	Calibration memory error; stored calibration values detected as invalid	Unit detects corruption or loss of calibration data in non-volatile memory	error
`Err 143`	One or more modes require calibration; specific modes lack valid calibration data	After board replacement (Controller P/N 61-6431, Transformer P/N 61-6445, Output P/N 61-6461) or calibration drift detected during preventative maintenance	error

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.