Safety first: Isolate the oven from the mains supply before removing any covers.

Steps to check:

Access sensor connections: Remove the rear panel of the oven. Locate the temperature sensor where it enters the cavity and trace its wires to the control board.
Check plug and terminals: Ensure the connector is firmly seated on the sensor and on the control board. Reseat the plug several times to clear oxidation.
Continuity test: Disconnect the sensor and measure resistance across its terminals. An open circuit (OL) indicates a failed sensor.
Harness test: If the sensor tests good, check continuity from the sensor connector to the control board connector through the wiring harness. Repair any breaks or replace the harness.
Replace sensor: If the sensor is open or intermittent, install a new Montpellier-compatible NTC sensor and secure it firmly in the cavity.
Control board: If wiring and sensor are confirmed good, the control board sensor input may be defective and should be replaced by a technician.

E2 error on display, oven does not heat or heats erratically.

Possible Causes