Philips HeartStart MRx

Asset Type

Defibrillator

Manufacturer

Philips

Model

HeartStart MRx

What This Guide Helps With

This guide helps troubleshoot CO2 Equip Malfunction on the Philips HeartStart MRx when EtCO2 monitoring is unavailable, unreliable, or unable to initialize. This condition may affect CO2 waveform display, numeric EtCO2 values, FilterLine recognition, sampling flow, or CO2 module communication.

Because CO2 monitoring may be used to assess ventilation, airway status, and CPR effectiveness, this error should be treated as a patient-monitoring failure until verified and corrected.

Step-by-Step Troubleshooting

Ensure Patient Safety First

• If the HeartStart MRx is being used on a patient and EtCO2 monitoring is needed, do not rely on the CO2 reading while this error is active.
• Provide alternate EtCO2 monitoring if clinically required.
• Confirm that required defibrillation, pacing, ECG, SpO2, NBP, and other patient-care functions are available on a reliable device.
• Remove the device from patient use if CO2 monitoring is required and the error cannot be cleared immediately through safe external checks.

Verify the Reported Error and Behavior

• Confirm the displayed or logged error is exactly CO2 Equip Malfunction.
• Note whether the error appears at startup, when CO2 is selected, after connecting a FilterLine, during monitoring, or intermittently during movement or transport.
• Check for related symptoms such as no EtCO2 waveform, no numeric CO2 value, CO2 unavailable messages, repeated CO2 initialization failure, or a CO2-related status log entry.
• Document whether the error is constant or intermittent.

Check the FilterLine First

• Remove the current FilterLine or sampling line.
• Inspect the line for kinks, crushed tubing, moisture, clogging, contamination, incorrect connection, or expired accessory use.
• Install a known-good compatible FilterLine.
• Allow the CO2 function time to initialize and confirm whether a waveform and numeric value appear when a valid sample is present.

Inspect the CO2 Inlet and Sampling Connection

• Inspect the CO2 inlet area for visible contamination, debris, fluid, damaged plastic, bent contact points, or poor accessory seating.
• Confirm the FilterLine seats fully and securely into the connector.
• If externally visible, check that the sampling path is not blocked by dried residue, debris, or cleaning fluid.
• Do not force accessories into the connector if damage is suspected.

Inspect for Physical Damage or Fluid Exposure

• Check the MRx housing near the CO2 connection area for cracks, impact marks, loose parts, or shifted module fit.
• Look for signs of fluid intrusion, cleaning residue, sticky deposits, corrosion, or contamination around the connector area.
• Ask staff whether the device was dropped, exposed to fluids, recently cleaned, transported, or stored in a high-risk location.

Power Cycle and Retest

• Power the MRx off.
• Disconnect the FilterLine.
• Wait briefly, then power the device back on.
• Reconnect a known-good compatible FilterLine and allow CO2 to initialize.
• Confirm whether the error clears or returns.

Confirm the Issue Is Specific to CO2

• Verify whether the rest of the HeartStart MRx operates normally.
• Check ECG display, SpO2 function if available, NBP if equipped, therapy controls, battery operation, AC operation, and general startup behavior.
• Look for additional equipment malfunction messages or failed readiness indicators.
• If multiple systems are failing, treat the issue as a broader device fault rather than only a CO2 accessory problem.

Review Logs or Operational Check Results

• Run the appropriate operational check if allowed by facility procedure and the device is not connected to a patient.
• Review any available status log or test result for CO2-related self-test, initialization, or communication failures.
• Record whether the fault appears during startup, CO2 selection, accessory connection, or testing.

Retest With Known-Good Accessories

• Use a known-good compatible FilterLine from approved stock.
• Avoid using expired, wet, kinked, contaminated, or previously failed sampling accessories.
• Confirm that the accessory packaging and connector type match the device configuration.
• If the known-good accessory works, replace the failed sampling line and document the accessory issue.

Stop When Resolved

• If replacing the FilterLine, clearing the inlet area, correcting accessory seating, or power cycling resolves the error, complete a final operational check before returning the device to service.
• Confirm CO2 initializes normally, the EtCO2 waveform appears when a valid sample is present, and the error does not immediately return.
• Document the complaint, observed cause, corrective action, and final device status.

If the Problem Persists

If the CO2 Equip Malfunction error remains after external checks, FilterLine replacement, inlet inspection, accessory seating verification, power cycling, and operational testing, common external causes have been ruled out.

Remove the Philips HeartStart MRx from service, label it Out of Service, and send it for repair or bench evaluation.

Persistent CO2 equipment malfunction may indicate an internal CO2 module, internal connection, sampling path, or communication-related failure that requires approved service evaluation.

Clinical Use Tip

Never troubleshoot CO2 monitoring on an active patient. Move the patient to a backup monitor or defibrillator first, and never rely on EtCO2 values from a device showing an unresolved CO2 equipment malfunction.

Work Order Documentation (CCR Method)

CCR = Complaint, Cause, Resolution

Complaint

What was reported by the clinical staff.

Example:
"Philips HeartStart MRx reported CO2 Equip Malfunction. Staff stated CO2 would not initialize and no EtCO2 waveform or numeric value was available during monitoring setup."

Cause

What was observed during troubleshooting.

Example:
"CO2 error was confirmed during startup and CO2 selection. Known-good compatible FilterLine was tested, CO2 inlet was inspected for blockage or contamination, and the fault remained after external checks."

Resolution

What action was taken.

Example:
"Removed device from service and labeled Out of Service for bench evaluation. External CO2 accessory and sampling path checks were completed, and persistent CO2 Equip Malfunction was documented for repair."

Helpful Details to Include (If Known)

• Alarm behavior
• Accessories swapped
• Power behavior
• Environmental factors
• Indicator lights
• Final device status

Final Thought

CO2 Equip Malfunction should be treated as a real monitoring failure until proven otherwise. Start with patient safety, then check the FilterLine, sampling path, connector area, power cycle behavior, and operational check results before escalating the device for repair.

That is successful troubleshooting.