Ariston Oven Error Code ER71

ER71 on an Ariston oven signals an I2C communication fault between the display board and the main control board. I2C is the internal protocol these two boards use to exchange data. When the communication fails or becomes defective, the oven logs ER71 to indicate the display board circuit is not responding correctly. The display board itself is the most common source of this fault.

It is not advisable to continue using the oven while ER71 is active. A communication breakdown between the display board and the main control board can prevent the oven from accurately receiving or displaying user commands, which may lead to unpredictable operation. The oven should be powered off and left unused until the fault is diagnosed and repaired.

A power reset, such as switching off the oven at the circuit breaker for a few minutes, may temporarily clear ER71 if the fault was caused by a transient communication glitch. However, if the display board has an internal failure or a connector is damaged, the error will return once the oven powers back on. A reset is worth attempting as a first step, but a lasting fix requires addressing the underlying hardware fault.

A knowledgeable DIYer can start by checking that all ribbon cables and connectors between the display board and the main control board are fully seated and free of corrosion. If that does not resolve the error, the display board will need to be replaced, which involves disconnecting the old board and installing a compatible replacement. Working on internal oven electronics requires the appliance to be fully disconnected from power before any inspection or repair.

Repair costs depend on whether the issue is a simple connector problem or requires a replacement display board. A replacement display board for an Ariston oven typically costs in the range of $80 to $200 for the part alone. Adding professional labor, the total repair bill can range from $150 to $350 or more depending on your location and service provider.