Furnace displays E10; often associated with internal communication or EEPROM errors.

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, Control board hardware failure, Power surge damage

Safety first: Disconnect power before handling electronics.

Power cycle: Turn off the furnace at the main switch for at least 30 seconds, then restore power to see if the error clears.
Check grounding: Ensure the furnace is properly earthed to reduce electrical noise.
Parameter reset (technician): A Sime technician can access the installer menu to verify and, if necessary, reload default parameters.
Replace control board: If E10 persists, the main PCB is likely defective and must be replaced with a correctly programmed Sime board.

Hard 4/5

Main Control Board

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