Blomberg
Auxiliary Circuit Failure (Fan/Light Supply)
Oven clock and display work, but the interior fan and light do not operate in any mode.
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
Open neutral or live feed to auxiliary circuits, failed relay on control board, broken wiring harness to fan and lamp, blown internal auxiliary fuse
How to Fix / Troubleshooting
Safety first: Disconnect power before accessing internal wiring.
- Check internal fuses: Some models have separate fuses for fan/light circuits. Test and replace if blown, using the correct rating.
- Inspect wiring harness: Trace the harness from the control board to the fan and lamp. Repair any breaks or burned connectors.
- Test fan and lamp individually: Measure resistance of the fan motor and lamp to confirm they are not open-circuit.
- Control board relays: If components and wiring are good, the auxiliary relay on the PCB may have failed. Replace the main control board if confirmed.
Advertisements
Repair Difficulty
Hard
4/5
Required Part
Main Control Board (Oven PCB)
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements