Proline Thermostat Control Instability

Oven temperature fluctuates widely during cooking, large swings above and below set point

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

Faulty electronic thermostat on PCB, Poor sensor contact with cavity, Loose sensor mounting, Electrical noise affecting control circuit

Safety first: Disconnect power before accessing internal components.

Check sensor mounting: Ensure the temperature sensor is firmly fixed to the cavity wall and not loose.
Inspect wiring: Reseat the sensor connector on the control PCB and ensure good contact.
Compare with thermometer: Use an oven thermometer to confirm the extent of fluctuation.
Replace control PCB: If the sensor is good and mounted correctly but fluctuations remain excessive, the thermostat circuit on the control PCB may be faulty and require replacement.

Hard 4/5

Main Control PCB

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