Furnace shows E20; no response to user inputs or random resets.

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 firmware, Power surge damage, Faulty EEPROM or microcontroller, Loose board connectors

Safety: Turn off power before touching the control board.

Power reset: Disconnect power for at least 1 minute, then restore. Sometimes this clears transient memory errors.
Inspect board: Look for burn marks, swollen components, or loose connectors. Reseat all low-voltage plugs.
Check supply voltage: Ensure the furnace is supplied with stable voltage within Kospel's specified range.

Persistent E20 usually requires control board replacement and possibly firmware programming by an authorized Kospel service center.

Professional Required 5/5

Main Control PCB

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