Efficia DFM100

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

Won't turn on source ↗

• Insert fully charged battery; connect AC

Short battery life source ↗

• Battery near end of life: replace

Therapy unavailable / device failure message at power-on source ↗

• Run an operational check; if it fails, take out of use and call service

Therapy cable message source ↗

• Select correct cable type (unplug/replug if wrong)
• Replace therapy cable

Low/absent audio source ↗

• Check volume setting
• Run operational check to test the speaker

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