Ariston Configuration / Memory Fault

Error 702, EEPROM or configuration error on control board.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Corrupted EEPROM, Incorrect parameter settings, Faulty control board, Power surge damage

Safety: Isolate power before working on electronics.

Reset to factory settings: If the Ariston menu allows, perform a factory reset of parameters following the installation manual.
Check supply voltage: Ensure the furnace is supplied with stable voltage within the specified range. Avoid using undersized extension cords or shared circuits.
Surge protection: Consider installing a surge protector to prevent future damage.

If 702 persists, the main control board will likely need replacement and reconfiguration by an authorized technician.

Professional Required 5/5

Control Board (PCB)

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