Bosch
No-heat condition / heating circuit failure
Bosch oven does not heat at all in any mode (no error code displayed)
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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.
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Possible Causes
Tripped thermal cut-out, Failed main control relay, Open heating element circuit, Loose power connection at terminal block
How to Fix / Troubleshooting
Safety first: Turn off power at the breaker and verify with a non-contact voltage tester before touching any wiring.
- Check power supply: Confirm the breaker is not tripped and that full line voltage is present at the oven terminal block.
- Inspect thermal cut-out: Access the top or rear of the oven and locate the thermal cut-out. Test for continuity and reset or replace if open.
- Test elements: Measure resistance of top, bottom, and grill elements. Replace any open elements.
- Control board relays: If power and elements are good, inspect the main control board for burnt or stuck relays. Replace the board if defective.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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