Philips HeartStart MRx

Asset Type

Defibrillator

Manufacturer

Philips

Model

HeartStart MRx

What This Guide Helps With

This guide helps troubleshoot a Philips HeartStart MRx Power Supply Failure error that may cause unreliable AC power, DC input, battery operation, charging behavior, startup performance, or Ready For Use status. A power supply fault on a defibrillator must be treated seriously because it can affect clinical readiness and emergency reliability.

Step-by-Step Troubleshooting

Ensure Patient Safety First

• If the HeartStart MRx is connected to a patient, in clinical use, assigned to a code cart, or staged for emergency response, remove it from use immediately if power reliability is in question.
• Provide clinical staff with a known-good backup defibrillator before troubleshooting.
• Do not continue using a defibrillator that may fail to power on, remain powered, charge, or operate reliably during emergency use.

Verify the Reported Error and Behavior

• Power the device on using the same power source reported by staff, if safe to do so.
• Confirm the exact displayed message is Error: Power Supply Failure.
• Document whether the error appears during startup, while connected to AC power, while operating on battery, during charging, intermittently during movement, or after battery replacement or storage.
• Check for related symptoms such as failure to power on, sudden shutdown, battery not charging, AC power not recognized, battery power not recognized, abnormal Ready For Use indicator, or repeated service messages.

Check the AC Power Source

• Confirm the AC power cord is fully seated at the wall outlet and at the HeartStart MRx AC power module.
• Plug the device into a known-good hospital-grade outlet.
• If available, verify the outlet with an outlet tester or another known-good device.
• If the device recognizes stable AC power and the error clears, document the original outlet or connection issue.

Inspect the AC Power Cord and External Power Module

• Inspect the AC power cord for cuts, crushed insulation, bent blades, loose plug fit, overheating marks, or strain relief damage.
• Inspect the AC power module area for looseness, damage, contamination, poor fit, or signs of impact.
• Reseat the power connection and verify whether the error clears.
• Replace damaged external power accessories according to facility policy before suspecting internal failure.

Check DC Input if Used

• If the HeartStart MRx is used with a DC input source, verify the DC cable, vehicle power source, or external DC supply is properly connected and functional.
• Inspect the DC cable and connector for looseness, bent pins, contamination, cracked housing, or damaged wiring.
• Test with a known-good DC source or cable if available.
• If the error occurs only on DC input, document the DC source, cable, and connector findings.

Check Battery Installation

• Power the unit off and remove the batteries.
• Inspect each battery compartment for batteries not fully seated, damaged contacts, bent or recessed contacts, dirt, corrosion, fluid contamination, cracked housing, or latch problems.
• Reinstall the batteries firmly and confirm they latch correctly.
• Verify whether the unit starts normally and whether the power supply error returns.

Try Known-Good Batteries

• Replace the installed batteries with known-good, charged HeartStart MRx batteries.
• Power the unit on using battery power only.
• Reconnect AC power and verify whether the batteries show normal charging behavior.
• If the error clears with known-good batteries, suspect weak, failed, depleted, aged, or poorly seated batteries.

Test on External Power Without Batteries

• If appropriate for your facility process, remove the batteries and connect the HeartStart MRx to known-good AC power.
• Power the unit on and observe whether the Power Supply Failure error appears.
• If the device works on known-good AC power without batteries, focus on battery condition, battery seating, and battery compartment contacts.
• If the device fails on known-good AC power without batteries, suspect the AC power path, AC module, or internal power-related circuitry.

Test Battery Power Without External Power

• Disconnect AC or DC power and operate the device using known-good batteries only.
• Observe whether the device starts normally, remains powered, and avoids the Power Supply Failure error.
• If the device works on battery but fails on AC, the issue may be isolated to the external power path or AC power module.
• If the device fails on both battery and external power, suspect an internal power path or power-related assembly failure.

Check for Intermittent Power Behavior

• With the device powered on and not connected to a patient, observe the unit during normal handling.
• Do not perform aggressive movement, impact testing, or unsafe manipulation.
• Watch for display flicker, sudden shutdown, AC icon dropout, battery icon changes, or error return when the cord or battery area is moved.
• Intermittent power behavior may indicate loose connections, worn contacts, damaged battery bays, or power input hardware concerns.

Review Device Indicators and Status Information

• Check the Ready For Use indicator and any visible power or battery indicators.
• If available through approved service process, review the device status log or error history for repeated power supply, battery, charging, or startup events.
• Document whether the error appears as a one-time event or repeated fault.
• Repeated logged power events support a true system fault rather than a simple low battery condition.

Run an Operational Check if the Unit Can Safely Power On

• If the HeartStart MRx powers on and remains stable long enough, perform the appropriate operational check according to facility procedure.
• Do not return the device to service if the power supply error remains active or returns during testing.
• Confirm normal startup, stable AC/DC or battery operation, normal charging behavior, and acceptable Ready For Use status.
• Return the device to service only after required checks pass and the fault does not return.

Isolate the Most Likely Failure Area

• If the error clears with known-good batteries, suspect failed, depleted, aged, or poorly seated batteries.
• If the error occurs only on AC power, suspect the AC power cord, AC module, outlet, or AC power path.
• If the error occurs only on DC input, suspect the DC cable, DC source, or DC input path.
• If the error changes when the battery compartments are touched, suspect battery contacts or compartment connection issues.
• If the error occurs on all known-good power sources, suspect an internal power supply path, charging circuit, or power-related assembly failure.

If the Problem Persists

If the Power Supply Failure error remains after checking AC power, DC input, batteries, battery seating, battery compartment contacts, and known-good external power sources, external and common causes have been ruled out.

A persistent power supply fault strongly indicates an internal power path, charging circuit, AC/DC input, or power-related assembly failure. Remove the HeartStart MRx from service, label it Out of Service, and send it for repair or bench evaluation.

Do not continue repeated clinical checks or return the unit to service with an unresolved power supply error.

Clinical Use Tip

Never troubleshoot a defibrillator power supply fault on an active patient. Move the patient or clinical area to a backup defibrillator first, then evaluate the affected HeartStart MRx only after patient care is protected.

Work Order Documentation (CCR Method)

CCR = Complaint, Cause, Resolution

Complaint

What was reported by the clinical staff.

Example:
"Philips HeartStart MRx displayed Error: Power Supply Failure during startup. Staff reported unreliable power behavior and concern that AC power or battery operation could not be trusted."

Cause

What was observed during troubleshooting.

Example:
"Known-good outlet, AC power connection, DC input, battery seating, battery compartment contacts, and known-good batteries were checked. Error persisted on multiple power sources, indicating likely internal power supply path or power-related assembly failure."

Resolution

What action was taken.

Example:
"Removed HeartStart MRx from clinical service, labeled device Out of Service, documented power source and battery checks, and escalated for bench repair or service evaluation."

Helpful Details to Include (If Known)

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

Final Thought

Power supply errors on a defibrillator must be taken seriously because they directly affect readiness and emergency reliability. Clinical Engineering should confirm the reported error, rule out simple external causes first, test known-good power sources and batteries, and escalate when the fault remains. Clear CCR documentation supports patient safety and efficient repair.

That is successful troubleshooting.