Ultima Cosa
No Heat / Open Heater Circuit
Air fryer runs but does not heat; fan blows only cool air.
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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
Failed heating element, Open thermal fuse, Loose heater connector, Burned heater relay contacts on main PCB
How to Fix / Troubleshooting
Safety first: Unplug and cool the unit before accessing internal components.
- Check for error codes: If no code is displayed but there is no heat, proceed with heater diagnostics.
- Inspect heater and wiring: Access the heating element assembly and look for breaks in the coil or burnt connectors.
- Test heater: Measure resistance across the heater terminals. An open circuit indicates a failed element that must be replaced.
- Check thermal fuse: Test continuity across the thermal fuse. Replace if open, using the correct Ultima Cosa-rated part.
- Control board: If heater and fuse are good, the heater relay on the main PCB may have failed. Replace the main control PCB.
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Repair Difficulty
Medium
3/5
Required Part
Heating Element Assembly
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