Ariston Oven Error Code ER33

ER33 indicates that the NTC temperature sensor located on the display board has been detected as either short circuited or open circuited. The control system cannot get a valid resistance reading from this sensor, so it flags the fault and displays ER33. The display board is the primary component involved in this error.

Operating the oven while ER33 is active is not recommended. The fault indicates the control system is missing sensor data it relies on to monitor conditions at the display board, which could affect how the oven behaves. It is best to stop using the oven until the fault is diagnosed and the display board is inspected or replaced.

The cost depends primarily on the price of the replacement display board, which typically falls in the range of $80 to $200 or more depending on the specific model. If a technician performs the repair, add labor costs on top of the part price, which can bring the total to somewhere between $150 and $350 or higher depending on your location and service rates.

A knowledgeable DIYer can address ER33 by first checking for any loose connectors or visible wiring damage at the display board. If no wiring fault is found, the fix requires replacing the display board, which involves disconnecting the oven from power and removing the control panel assembly. If you are not comfortable working with oven electronics, a qualified technician should perform the repair.

Resetting the oven by cutting power may temporarily clear the display, but ER33 will return if the underlying fault in the NTC sensor or display board has not been corrected. A reset is not a repair. The error will reappear as soon as the control system re-checks the sensor circuit.