Bosch No Heat / Open Heater Circuit

Air fryer runs but does not heat; fan operates normally and timer counts down.

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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

Open heating element, Burnt heater wiring, Loose heater terminal connection, Failed heater relay on control board

How to Fix / Troubleshooting

Safety first: Unplug and let the unit cool. Heating components are high‑wattage and can cause shock if mishandled.

Steps:

  • 1. Confirm no heat: After 5 minutes of operation at maximum temperature, carefully feel near the exhaust vents. If still cool, the heater is not energizing.
  • 2. Visual inspection: Look at the heating element through the guard. Check for breaks or burn spots.
  • 3. Access heater: Remove the cover to expose the heating element assembly. Inspect wiring and terminals for burning or looseness.
  • 4. Test element: Disconnect one terminal and measure resistance. An open circuit indicates a failed element that must be replaced.
  • 5. Control board: If the element is good, inspect the heater relay on the control board for damage. Board replacement is typically required.
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Repair Difficulty

Hard 4/5

Required Part

Heating Element Assembly
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