F10 displayed, furnace fails to start, no response from user controls

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

Faulty display/control panel, Damaged communication cable, Loose plug connection on Glow-worm PCB, PCB communication circuit failure

Safety: Turn off power before removing the front fascia or control panel.

Technician steps:

Remove the front panel and check the ribbon cable or harness between the user interface and main PCB for damage or dislodged connectors.
Reseat connectors firmly and check for bent pins.
If available, plug in a known-good control panel to test communication.
Measure supply voltage to the user interface from the PCB.
Replace the user interface module or main PCB as indicated by test results.

Hard 4/5

User Interface / Display Board

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