How to Fix / Troubleshooting

Safety first: Turn off power and allow the oven to cool completely before inspection.

Steps to check:

Verify that the cooling fan (tangential fan above the cavity) runs when the oven is heating. If it does not, check the fan motor and its wiring.
Ensure that the built-in oven has correct ventilation clearances as per Gram installation instructions. Clear any obstructions from the top and rear vents.
Inspect the temperature sensor for signs of damage or discoloration from overheating. Test its resistance at room temperature and compare to specification.
Check that the oven door closes fully and the door seal is intact; heat leakage can cause abnormal readings.
If the fan and sensor are OK but E3 recurs, the main PCB may be misreading the sensor and require replacement.

Warning: Do not bypass safety thermostats or sensors. They prevent fire and severe damage.

Oven displays E3 and will not heat or overshoots temperature then shuts down.

Possible Causes