E12

Blomberg Cooling Fan Control Error

Microwave displays E12 and the cooling fan runs continuously even when idle.

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.

Possible Causes

Stuck cooling fan relay on control board,Shorted cooling fan motor,Faulty temperature sensor causing fan to run,Control board logic fault

How to Fix / Troubleshooting

Safety: Unplug the microwave before servicing. Moving fan blades can cause injury.

User checks:

1. Power reset: Unplug the unit for 10 minutes, then reconnect. If the fan immediately starts and E12 appears, the issue is likely hardware-related.
2. Listen for abnormal noise: A noisy or grinding fan may be drawing excessive current and confusing the control.

Advanced steps:

3. Inspect fan motor: Remove the outer cabinet and locate the cooling fan. Check for obstructions and ensure the blades spin freely.
4. Test fan motor: Measure motor winding resistance and compare with specifications. Replace if shorted or open.
5. Check fan relay: On the control board, identify the fan relay. Look for welded contacts or burn marks. Board replacement is typically required if the relay is stuck.

Repair Difficulty

Hard 4/5

Required Part

Cooling Fan Motor

Check Price on Amazon

We may earn a commission from links on this page.