F20
AGA
Secondary Cavity Control Fault
AGA oven displays F20; one cavity in a multi-oven AGA module does not heat while others work.
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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
Dedicated cavity control board failure, open wiring harness to that cavity, faulty cavity sensor, failed element in that cavity
How to Fix / Troubleshooting
Safety first: Isolate the entire AGA module from mains power before removing panels.
- Identify affected cavity: Note which oven (roasting, baking, simmering, etc.) is not heating.
- Check elements and sensors: Test the heating element(s) and temperature sensor in the affected cavity for continuity and correct resistance.
- Inspect harness: Trace the wiring from the main control area to the affected cavity, looking for loose plugs or damage.
- Check sub-board (if fitted): Some AGA models use a small control board dedicated to a specific cavity. Inspect for burnt components or loose connectors.
- Replace faulty parts: Replace any failed element, sensor, or cavity control board with AGA-approved components.
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Repair Difficulty
Hard
4/5
Required Part
Secondary Cavity Control Board / Element
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