Ariston Oven Error Code ER70

ER70 on an Ariston oven indicates an I2C communication fault involving the power supply board. The I2C bus is an internal serial protocol that allows the oven's circuit boards to exchange data, and ER70 means this communication has broken down. The most common cause is a defective power supply board, which requires replacement to resolve the fault.

An ER70 fault typically prevents the oven from operating normally, as the communication breakdown causes the control system to halt. You should not attempt to bypass the error or force the oven to run while this fault is active. Discontinue use and have the oven inspected before cooking with it again.

Repair costs depend on parts pricing and local labor rates. A replacement power supply board typically falls in the range of $80 to $200 or more depending on availability, and a technician's labor for diagnosis and replacement can add $100 to $250 to the total. Getting a quote from a certified technician before proceeding is recommended to weigh repair cost against appliance age.

A knowledgeable DIYer can inspect the wiring connectors and harness between the power supply board and the main control board for obvious damage or loose connections. However, if the fault persists, replacing the power supply board requires working inside the oven's electrical enclosure, which involves mains voltage components. For safety, this repair is best handled by a qualified appliance technician.

A power reset by switching the oven off at the circuit breaker for several minutes may temporarily clear the display, but ER70 caused by a defective power supply board will return because the underlying hardware fault remains. A reset is not a repair and the fault code will reappear once the oven attempts normal communication again.