Sage
Fan speed control failure
Fan runs at maximum speed constantly, even at low temperature settings.
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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
Shorted fan speed control transistor or triac, Incorrect fan wiring to constant mains, Firmware or MCU output stuck high, Fan motor replaced with non‑PWM compatible type
How to Fix / Troubleshooting
Safety first: Unplug before opening the unit.
- Confirm behavior: Test multiple programs and temperatures. If fan speed never changes, suspect control hardware.
- Inspect wiring: Ensure the fan motor is wired according to the original harness layout and not directly to mains.
- Board inspection: Check the fan driver components on the control PCB for visible damage. Replace the board if components are burnt.
- Acceptable operation: While a constant high fan speed may still cook food, it can affect performance and noise. For proper operation, replace the faulty control PCB.
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Repair Difficulty
Hard
4/5
Required Part
Main Control PCB
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