Make sure the patient is safe — swap in a backup unit if you need to.
Reproduce the complaint yourself and write down exactly what you see (screen, alarm, code).
Check power, battery, cables, accessories, and settings before ordering parts.
Then open the service manual above and follow its troubleshooting section.

🛠️ Common faults for MRx (8)

Won't turn on / Batteries Low / Shutting Down source ↗

Insert a fully charged battery or connect AC/DC; Batteries Low means less than 10 min of monitoring or six 200 J shocks
Charge indicators inaccurate: calibrate the battery; short life: replace it

Poor ECG (noise or wandering baseline) or flat line with no Leads Off source ↗

Fresh, in-date electrodes or pads with skin prep; move away from RFI sources
Run the Operational Check with the cable, then without it; if it passes without, replace the cable, otherwise service

No Shock Delivered: Replace Pads / Press Pads Firmly / Low-High Impedance source ↗

Low impedance: replace the pads; high impedance: press pads firmly
Paddles: improve skin contact; replace the paddles if it persists

Slow charge to selected energy source ↗

Running on AC/DC with no or a low battery: install a charged battery

Pacing Stopped [Leads Off] / [Pads Off] source ↗

Reapply the electrodes or pads and check the cables, then press [Resume Pacing]

NBP Cuff Not Deflated / Interrupted / Measurement Failed; cuff won't inflate source ↗

Remove and deflate the cuff; check cuff size, placement and tubing; replace the cuff
Calibration is due yearly or every 10,000 cycles; end of life is 50,000 cycles

Printer: paper won't move, faint print, missing dots, grinding source ↗

Reload the paper or clear the jam; replace wet paper; latch the door
Clean the printhead; let it cool if hot
Printer Malfunction: power off for 15 s; otherwise service

Operational Check failures (Charge/Shock Button, Therapy Knob, Shock Equip) source ↗

Remove from use and call service
Therapy Cable Failure during the check: attach a therapy cable and rerun

🔢 MRx error codes (15)

Code	Meaning	Next step
Device Error. Service Required.	Failure detected at start-up	Take out of use; call service source ↗
All Settings Have Been Set To Factory Default Values	Corrupt or incomplete configuration	Reload the configuration file source ↗
Fan Failure	Internal fan not running	Service source ↗
Internal Memory Failure	Card reformatted after a failed self-test	Ready again; prior data was erased source ↗
Event Storage Full	Over capacity or the 12 h limit	Print or copy the Event Summary and start a new case source ↗
Power Supply Failure INOP	Internal power supply fault	Remove from use source ↗
Replace Clock Battery	Internal clock battery	Service source ↗
Shock Equip Malfunction INOP	Hardware prevents a shock	Remove from use source ↗
Pads ECG Cable Failure / ECG Cable Failure INOP	Lead wire shorted to ground	Replace the cable; Operational Check source ↗
ECG Equip Malfunction INOP	Hardware failure	Operational Check without the cable; service if the Leads ECG test fails source ↗
Pacer Equip Malfunction INOP	Pacing hardware	Service source ↗
NBP Calibration Overdue / NBP Equip Malfunction / NBP Service Required	Calibration due, NBP hardware fault, or 50k cycles	Service the NBP module; don't use NBP source ↗
Maximum Energy 50J	Internal paddles	Select ≤50 J source ↗
R-Wave Not Detected	Sync cardioversion	Pick a lead with a clear QRS source ↗
Printer Malfunction / Check Printer / Incompatible Printer	Printer fault, no paper or door open, or fonts	Power cycle 15 s; load paper; Asian fonts need the 75 mm printer source ↗

🧰 Common checks for Defibrillators (1)

Won't charge or deliver shock source ↗

Isolate controls: try paddles vs. pads vs. front-panel buttons
Check pad/paddle contact and cables (impedance disarm)
Check battery / run on AC; slow charge often = battery
Read stored failure codes in service mode before replacing therapy module

📞 Still stuck? Call Philips Healthcare

Contact Philips Healthcare US

📞 Tech support: 1-800-722-9377
🛠️ Service: 1-800-722-9377, option 4 then 3 (parts ordering)

Professional Healthcare Product Support incl. on-site maintenance and parts. Canada 1-800-567-1080.

Source ↗

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