Telefunken
No Heating – High Voltage System Failure
Microwave runs but does not heat food at all; no error code on Telefunken display.
Advertisements
Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
Advertisements
Possible Causes
Failed magnetron, Failed high-voltage transformer or inverter, Open high-voltage diode, Blown high-voltage capacitor
How to Fix / Troubleshooting
Critical safety warning: High-voltage components can be lethal. If you are not trained, limit yourself to basic checks and leave internal HV work to a professional.
- Confirm symptom: Place a cup of water inside and run on full power for 1–2 minutes. If the water remains cold, heating is not occurring.
- Listen for abnormal sounds: A loud hum, buzzing, or burning smell suggests HV component failure.
- User-level actions: Verify that the door closes properly and that the power level is set to 100%. Try a different outlet.
- Professional diagnosis: Internal testing of the magnetron, transformer/inverter, HV diode, and capacitor should be done by a Telefunken-qualified technician. Components must be replaced with exact-spec Telefunken-compatible parts.
Advertisements
Repair Difficulty
Professional Required
5/5
Advertisements