Oven displays E1 and will not heat or stops shortly after starting.

Safety first: Turn off the oven at the mains and allow it to cool completely before inspection.

Steps to check:

• Allow full cool-down: Leave the oven door open and let the appliance cool for at least 30–60 minutes. Restore power and see if E1 clears.
• Check ventilation: Ensure the built-in oven has the clearances specified in the Montpellier installation manual. Blocked vents or tight cabinetry can cause overheating.
• Inspect cooling fan operation: Start the oven (if possible) and listen for the internal cooling fan at the top/rear. If it does not run, the fan motor or its wiring may be faulty.
• Test temperature sensor: With power off, access the NTC sensor at the rear of the cavity. Measure resistance at room temperature and compare with specifications. A very low resistance (near short) can trigger E1.
• Clean around sensor: Heavy grease or burnt-on residue around the sensor tip can cause inaccurate readings. Gently clean the area with a non-abrasive cleaner.
• Replace faulty parts: Replace the temperature sensor or cooling fan motor if they fail tests. If both are good, the control board may need replacement by a professional.