Oven shows F20 and will not start any heating function.

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

Burned heater relay contacts, Failed relay board, Loose harness between control and relay board, Overheated relay terminals

Safety: Isolate the appliance from mains before removing any covers.

Visual inspection: Access the relay/power board (often behind the rear panel). Look for burnt areas around relays or connectors.
Check connectors: Reseat all harnesses between the main control and relay board.
Test outputs: With extreme caution and only if qualified, measure voltage at heater outputs when a heating mode is selected. Lack of output with proper input control signal indicates a bad relay board.

Repair: Replace the relay/power board as a complete unit.

Professional Required 5/5

Oven Relay / Power Board

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