Safety first: Disconnect the oven from mains power before removing the top cover.

Identify the fan: The cooling fan is located above the oven cavity, blowing air across the control panel and front fascia.
Check for obstruction: Remove the top cover and inspect the fan blades for insulation, debris, or grease buildup preventing rotation. Clean carefully with a brush and vacuum.
Spin test: Rotate the fan by hand. It should spin freely without grinding. If stiff or noisy, the motor is likely failing and should be replaced.
Electrical test: With power off, disconnect the fan and measure coil resistance. An open circuit indicates a failed motor. If resistance is normal, the issue may be with the control board output.
Check overheat thermostat: Some Grundig ovens use a thermal cut-out or thermostat in series with the fan. Test it for continuity at room temperature. Replace if open when it should be closed.
Control board diagnosis: If the fan runs constantly even when the oven is cold and off, the triac/relay on the PCB may be shorted. Board replacement is usually required.

Note: A non-working cooling fan can cause damage to the control panel and surrounding cabinetry due to excessive heat.

Oven cooling fan runs continuously or error appears related to cooling system

Possible Causes