Luxaire Control Board Relay Failure or Low 24V Signal

Thermostat calls for heat but furnace only clicks and does not start inducer or blower.

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

Weak transformer, Loose low-voltage connections, Failed control board relay, Faulty thermostat

Safety: Turn off power before touching wiring.

Steps to check:

Thermostat batteries: Replace batteries if applicable.
Check low-voltage wiring: Ensure R and W connections at the Luxaire control board are tight.
Bypass thermostat: Temporarily jumper R to W at the control board. If the furnace starts, the thermostat or cable is suspect.

If the furnace still only clicks, the control board or transformer likely needs professional replacement.

Medium 3/5

Integrated Furnace Control Board or 24V Transformer

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