Ninja
Output Stage Failure / Logic Only Operation
Timer counts down but heater and fan do not run; unit appears "on" but not cooking.
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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 heater and fan relays, Control board output driver failure, Disconnected output harness, Firmware glitch
How to Fix / Troubleshooting
Safety first: Unplug before opening the unit. Internal circuits carry mains voltage.
- Step 1 – Reset: Unplug for 10 minutes, then plug back in and test a short cycle.
- Step 2 – Listen for relays: When starting a cook cycle, you should hear clicks from relays engaging. If there are no clicks, the outputs may not be energizing.
- Step 3 – Internal inspection (advanced): Open the housing and verify that the wiring harness from the control board to the heater and fan is connected.
- Step 4 – Board replacement: If wiring is intact and there is still no power to the heater or fan, the control board output stage is likely faulty and requires replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board
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