Luxaire Loss of 24V Control Power

Luxaire air conditioner thermostat display is blank and system does not run.

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

Blown low‑voltage fuse, Failed 24V transformer, Shorted thermostat cable, Tripped condensate float switch

Safety: Turn off power to the air handler before accessing the control board.

Check float switch: Ensure the condensate pan is not full and the float switch is not tripped.
Inspect low‑voltage fuse: On the Luxaire control board, replace a blown 3–5A fuse with the same type and rating.
Look for shorts: Inspect thermostat wiring for bare spots touching metal. Repair or replace damaged cable.
Transformer test: If fuse is intact but no 24V is present, a technician should test and replace the transformer if failed.

Medium 3/5

24V Control Transformer

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