Display shows E05, indicating air pressure switch or fan proving fault

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

Blocked air intake, Faulty air pressure switch, Weak or failed combustion fan motor, Cracked or disconnected pressure tubing

Safety: Disconnect power before working on the fan or pressure switch.

Steps:

Clear intake: Inspect and clean the combustion air intake and any screens.
Check tubing: Replace brittle or loose tubing to the pressure switch. Ensure ports are not plugged.
Test switch: Use a multimeter to verify the switch closes when the fan runs. Replace if it does not.

If E05 persists with a good switch and clear intake, the fan motor may need replacement.

Hard 4/5

Air Pressure Switch

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