Bella Heater and fan both not energizing while control logic runs

Bella air fryer timer counts down but there is no heat and no fan noise.

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

Failed main relay on control PCB, Open neutral or hot connection to load circuits, Internal wiring harness disconnected, Safety thermostat open

Safety first: Unplug the unit before opening the housing.

Internal inspection:

Open the housing and locate the main control PCB and wiring harnesses to the heater and fan.
Check for any disconnected plugs or loose spade connectors.
Inspect the board for a main relay (or triac) with signs of burning or cracking.
Verify continuity through the high‑limit thermostat and thermal fuse.

If all wiring and safety devices are intact, the main control PCB is likely not switching power to the heater and fan and should be replaced.

Hard 4/5

Main Control PCB for Bella Air Fryer

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