Patient monitors

Philips M1026A: troubleshooting and error codes

The ServiceForge knowledge base holds 44 documented symptoms for the Philips M1026A, with 122 ranked causes, 73 diagnostic checks with test points and expected values, and 0 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Pneumatic system shows problem high voltage

Diagnostic check indicates failure in pneumatic system of anesthetic gas module

Ranked causes

1. Defective cables (common)
2. Solenoid or air reference filter problem (common)
3. Occluded pneumatics (common)
4. Flowrate problem (occasional)
5. Flow transducer incorrectly connected (occasional)
6. Pump problem (occasional)
7. Defective power supply (occasional)
8. Defective main PC board (rare)

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

Calibration: Span calibration failure

Span calibration shows Failed for O2, N2O, CO2, or anesthetic agent channels

Ranked causes

1. Zero calibration failed for indicated channel (common)
2. Incorrect agent selection or calibration values (common)
3. Flowrate problem (occasional)
4. Leakage problem (occasional)
5. Wrong gas applied for calibration (occasional)
6. Calibration reservoir bag empty or gas canister empty (common)
7. Measurement assembly problem (occasional)

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

Calibration: Zero calibration failure

Zero calibration failed during Anesthetic Gas Module calibration checks or Agent-ID Zero calibration failed

Ranked causes

1. Solenoid or air reference filter problem (common)
2. Occluded pneumatics (common)
3. Flowrate problem (occasional)
4. Flow transducer incorrectly connected (occasional)
5. Pump problem (occasional)
6. IR measurement head problem (rare)
7. Agent-ID problem (rare)

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

Operating temperature shows problem caution

Diagnostic check indicates operating temperature outside acceptable range

Ranked causes

1. Defective fan (common)
2. Insufficient air circulation due to blockage (common)
3. Operating environment outside limits (occasional)
4. Defective IR measurement assembly head (rare)
5. Defective agent ID head (rare)
6. Defective power supply (rare)
7. Defective main PC board (rare)

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

Gas analyzer zero calibration failed

Zero point calibration unable to complete or out of tolerance

Ranked causes

1. Purge flow out of tolerance (common)
2. No flow calibration after flow adjustment (common)
3. Occlusion during zero calibration (occasional)
4. Solenoid 1 defective (occasional)
5. Ambient pressure mismatch (occasional)
6. IR measurement head problem (rare)

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

O2 assembly shows problem patient safety

Diagnostic check indicates failure in oxygen measurement assembly

Ranked causes

1. O2 jumpers incorrectly set (common)
2. O2 sensor failed calibration (common)
3. Defective O2 sensor (occasional)
4. Defective cables (occasional)
5. Defective power supply (rare)
6. Defective main PC board (rare)

First check

Measure O2 sensor voltage

Test point: TP8
Expected: 1% O2 approximately equals 10mV; adjust for barometric pressure, ±10% of calculated value
Tools: Voltmeter

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

Agent ID assembly shows problem caution

Diagnostic check indicates failure in agent identification assembly

Ranked causes

1. Wrong Agent-ID software revision (common)
2. Defective agent ID head (occasional)
3. Defective power supply (rare)
4. Defective cables (occasional)
5. Defective main PC board (rare)

First check

Measure IR source voltage

Test point: TP11
Expected: 7.92V ±20mV, ±20mV
Tools: Voltmeter

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

Gas analyzer occlusion

Restricted gas flow detected in analyzer system

Ranked causes

1. External occlusion (common)
2. Internal occlusion (occasional)
3. Weak or defective pump (occasional)
4. Leakage between pump and flow restrictor (rare)
5. Flow transducer incorrectly connected (rare)

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

Anesthetic Gas Module hardware or measurement failure patient safety

M1026A Opt. #A02 and Opt. #A05 Anesthetic Gas Module shows INOPs (In-Not-Operatable condition) or measurement errors requiring troubleshooting

Ranked causes

1. Failed calibration check or procedure (common)
2. Failed diagnostic check (occasional)
3. Communication issue between module and monitor (occasional)
4. Measurement signal failure or sensor malfunction (occasional)

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

Gas analyzer accuracy questionable

Measurement accuracy may be compromised

Ranked causes

1. Flow rate error (common)
2. No flow calibration after adjustment (common)
3. Partial occlusion (occasional)
4. IR head problem (occasional)

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

IR measurement assembly shows problem caution

Diagnostic check indicates failure in infrared measurement assembly head

Ranked causes

1. Defective IR measurement assembly head (common)
2. Defective power supply (rare)
3. Defective cables (occasional)
4. Defective main PC board (rare)

First check

Measure IR source voltage

Test point: TP6
Expected: 7.87V ±20mV, ±20mV
Tools: Voltmeter

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

Optical path shows problem caution

Diagnostic check indicates failure in IR optical measurement path

Ranked causes

1. Defective or contaminated sample cell (common)
2. Defective IR measurement assembly head (occasional)
3. Defective power supply (rare)
4. Defective main PC board (rare)

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

Anesthetic gas module not available

AGM not responding to system; module or communication inactive

Ranked causes

1. AGM not switched on (common)
2. AGM not properly connected (common)
3. Wrong or no RS232 configuration (occasional)

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

Calibration: Anesthetic Gas Module M1026A Opt. #A02 and Opt.#A05 patient safety

Periodic verification and calibration of anesthetic gas measurement system to ensure operation within specified limits. Required after installation, every 12 months, after repair, or when measurements are in doubt.

Ranked causes

1. Leakage or incorrect flowrate in gas system (unknown)
2. Zero calibration drift or out-of-tolerance measurements (unknown)
3. Barometric Pressure or Span calibration out of tolerance (unknown)

First check

Enter Service Mode and allow automatic zero calibration

Test point: ACMS or V24 and V26 system
Expected: Automatic zero calibration completes after warm-up period

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

Calibration: Measurement path flowrate in Normal mode

Check measurement path flowrate using test fixture M1026-60136 with electronic flowmeter M1026-60144 connected to measurement line, verify against labelled fixture value ± 3 ml/min.

Ranked causes

1. Test fixture invalid or expired (> 2 years old) (unknown)
2. Test fixture has visible leaks (unknown)
3. Flowrate outside tolerance (labelled value ± 3 ml/min) (unknown)

First check

Enter Service Mode at ACMS

Test point: ACMS display
Expected: Service Mode active

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

Calibration: O2 Zero calibration failure

O2 Zero calibration shows Failed status during anesthetic gas module checks

Ranked causes

1. Flowrate problem (common)
2. O2 Span problem (occasional)
3. O2 sensor problem (occasional)

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

Main PC board shows problem caution

Diagnostic indicates main PC board may be faulty or communication failure

Ranked causes

1. Defective power supply (common)
2. Defective cable (common)
3. Defective main PC board (occasional)

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

O2 measurement unable to complete

Oxygen sensor unable to provide valid measurements

Ranked causes

1. Flow rate error (common)
2. No flow calibration after adjustment (common)
3. O2 data not valid (occasional)

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

Power supply shows problem high voltage

Diagnostic check indicates failure in power supply module

Ranked causes

1. Defective power supply (common)
2. Defective cables (occasional)
3. Defective main PC board (rare)

First check

Measure power supply voltages

Test point: TP14, TP15, TP16, TP17, TP18
Expected: TP14: +12V, TP15: +5V, TP16: -12V, TP17: +12V, TP18: Analog Ground
Tools: Voltmeter

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

Agent identification malfunction

Agent identification system fault or software version mismatch

Ranked causes

1. Wrong Agent-ID software revision (occasional)
2. Serious Agent-ID problem (occasional)

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

Agent identification zero calibration failed

Agent identification sensor unable to complete zero calibration

Ranked causes

1. Solenoid 2 defective (common)
2. Agent-ID problem (occasional)

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

Agent measurement unable to complete

Anesthetic agent sensor unable to provide valid measurements

Ranked causes

1. Agent span calibration failed (common)
2. Agent data not valid (occasional)

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

Calibration: Anesthetic Gas Module leakage check

Verify pneumatic system integrity by measuring gas leakage at inlet and exhaust points using electronic flowmeter connected to exhaust and inlet outlets.

Ranked causes

1. Leakage in pneumatic path before pump (unknown)
2. Leakage in pneumatic path after pump (unknown)

First check

Switch on M1026A AGM and ACMS or V24/V26

Test point: M1026A power
Expected: Unit powered

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

Calibration: Total flowrate in Purge mode (310 ml/min)

Measure and adjust total flowrate in Purge mode at exhaust outlet using electronic flowmeter, then save calibration settings.

Ranked causes

1. Flowrate outside tolerance (310 ml/min ± 15 ml/min) (unknown)
2. Calibration value not saved (unknown)

First check

Enter Service Mode at ACMS

Test point: ACMS display
Expected: Service Mode active

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

CO2 measurement unable to complete

Carbon dioxide sensor unable to provide valid measurements

Ranked causes

1. CO2 span calibration failed (common)
2. CO2 data not valid (occasional)

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

Gas analyzer equipment malfunction

Communication error or serious IR measurement head problem detected

Ranked causes

1. Communication problem with AGM or ACMS (common)
2. Serious IR measurement head problem (occasional)

First check

Verify communication status

Test point: AG Diag Window
Expected: PASSED or PROBLEM status shown
Tools: Service mode software

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

N2O measurement unable to complete

Nitrous oxide sensor unable to provide valid measurements

Ranked causes

1. N2O span calibration failed (common)
2. N2O data not valid (occasional)

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

O2 equipment malfunction

Oxygen sensor or measurement system fault

Ranked causes

1. O2 span calibration failed (common)
2. O2 incorrectly set to digital 45% (occasional)

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

Anesthetic Gas Module functional calibration verification patient safety

Field calibration procedure to verify zero and span of anesthetic gas measurement sensors after maintenance or repair

Ranked causes

1. Calibration required after sensor or circuit replacement (common)

First check

Verify zero calibration

Test point: Sensor output during room air or zero gas input
Expected: Reading 0% or baseline reference
Tools: PM Kit; Calibration gas supply

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

Anesthetic Gas Module leakage check with test fixture

Perform leakage check using test fixture M1026-60136 instead of watertrap to verify fixture integrity before measurement path flowrate check in Normal flow mode.

Ranked causes

1. Test fixture has leaks (unknown)

First check

Attach test fixture to AGM exhaust and manifold

Test point: AGM exhaust and watertrap manifold
Expected: Test fixture connected for Normal flow operation

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

Calibration: Anesthetic Gas Module agent measurement patient safety

Anesthetic agent reading does not match calibration gas content; tolerance ±0.1%

Ranked causes

1. Anesthetic agent calibration out of tolerance (unknown)

First check

Measure anesthetic agent value with calibration gas applied

Test point: Agent reading on display
Expected: ±0.1% of stated calibration gas content, ±0.1%

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

Calibration: Anesthetic Gas Module CO2 measurement patient safety

CO2 reading does not match calibration gas content; tolerance ±0.1%

Ranked causes

1. CO2 calibration out of tolerance (unknown)

First check

Measure CO2 value with calibration gas applied

Test point: CO2 reading on display
Expected: ±0.1% of stated calibration gas content, ±0.1%

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

Calibration: Anesthetic Gas Module N2O measurement patient safety

N2O reading does not match calibration gas content; tolerance ±2.0%

Ranked causes

1. N2O calibration out of tolerance (unknown)

First check

Measure N2O value with calibration gas applied

Test point: N2O reading on display
Expected: ±2.0% of stated calibration gas content, ±2.0%

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

Calibration: Anesthetic Gas Module O2 measurement patient safety

O2 reading does not match calibration gas content; tolerance ±1.0%

Ranked causes

1. O2 calibration out of tolerance (unknown)

First check

Measure O2 value with calibration gas applied

Test point: O2 reading on display
Expected: ±1.0% of stated calibration gas content, ±1.0%

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

Calibration: Anesthetic Gas Module Zero point verification patient safety

Room air readings do not match expected values after all span calibrations

Ranked causes

1. Zero calibration or span calibration drift (unknown)

First check

Measure O2 with room air

Test point: O2 reading on display
Expected: 20.9% ± 0.2%, ±0.2%

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

Calibration: barometric pressure

Set barometric pressure to match absolute atmospheric pressure at hospital location

Ranked causes

1. Barometric pressure set incorrectly for altitude (common)

First check

Verify barometric pressure setting matches hospital location atmosphere

Test point: calibration task window
Expected: Ambient Pressure ± 5 mmHg, ±5 mmHg

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

Calibration: flowrate

Verify exhaust flowrate is within tolerance (132–170 ml/min at 150 ml/min setting)

Ranked causes

1. Tubing occluded or restricted (common)

First check

Connect flowmeter to exhaust outlet

Test point: exhaust outlet
Expected: flowrate between 132 ml/min and 170 ml/min, 132–170 ml/min

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

Calibration: O2 Span calibration failure

O2 Span calibration shows Failed status

Ranked causes

1. O2 sensor problem (common)

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

Calibration: span caution

Verify anesthetic gas measurement accuracy using calibration gas bottle; requires 30 min warmup and prior completion of leakage, diagnostic, flowrate, zero and barometric checks

Ranked causes

1. Calibration gas bottle value mismatch or insufficient gas (occasional)

First check

Verify module has warmed up for at least 30 minutes

Test point: module runtime
Expected: ≥30 minutes since power-on

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

Calibration: zero

Verify zero baseline calibration; displays pass/fail for each channel

Ranked causes

1. Channel zero offset drift or sensor fault (unknown)

First check

Enter Service mode with top cover closed

Test point: ACMS display
Expected: Service mode accessible; no light or EM interference

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

Gas measurement disturbed

Transient measurement interference detected (CO2, N2O, agent, or O2)

Ranked causes

1. Minor transient IR head problem (common)

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

O2 sensor zero calibration failed

Oxygen sensor unable to establish zero calibration point

Ranked causes

1. O2 sensor fault (common)

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

Perform post-replacement performance checks

After O2 sensor replacement, comprehensive performance testing is required per specification matrix

Ranked causes

1. Verify sensor installation and function (unknown)

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

Replace O2 sensor and PC board

O2 sensor requires replacement together with its control PC board; newer sensors have integrated board inside housing

Ranked causes

1. O2 sensor end-of-life or failure (unknown)

First check

Verify module is powered off and isolated from mains

Test point: Module power switch and mains supply
Expected: Module off, mains disconnected

4 more checks with pass and fail actions, 4 corrective actions, and part numbers 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.