The control board displays F01; the furnace may not respond to thermostat commands.

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

Failed microprocessor on the IFC, power surge or lightning damage, corroded board connectors, moisture intrusion into the control compartment.

Safety: Disconnect the power before touching the control board.

Steps:

Inspect the control compartment for signs of water leaks from humidifiers or condensate lines. Correct any leaks before replacing electronics.
Check all multi-pin connectors on the IFC for a tight fit and corrosion; reseat them.
Verify that the line voltage to the board is within the specified range (typically 120 V ±10%).
If F01 persists after power cycling and connector checks, replace the integrated furnace control with a Westinghouse-approved replacement, transferring each wire one at a time.

Note: Board replacement is moderately advanced; if unsure, hire a technician.

Hard 4/5

Integrated Furnace Control Board

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