Furnace shows E20, no heating, may occur after configuration changes.

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

Incorrect installer settings, Corrupted configuration memory, Wrong model selection in control menu

Safety: Only qualified personnel should change installer parameters.

Steps:

Restore factory settings: If accessible, use the Cointra installer menu to restore default parameters for your furnace model.
Verify model selection: Ensure the control board is configured for the correct Cointra furnace type and gas category.

Professional help: If you are not trained on Cointra installer menus, contact an authorized technician to reprogram or replace the control board.

Professional Required 5/5

Main Control Board

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