F5
Luxaire
Indoor Humidity / Accessory Sensor Fault
Luxaire air conditioner displays F5; system may not respond correctly to thermostat or may run at wrong capacity.
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Safety Warning
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.
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Possible Causes
Failed indoor humidity sensor (if equipped), Loose connection to communicating thermostat, Incorrect accessory wiring
How to Fix / Troubleshooting
Safety: Turn off power to the air handler and thermostat.
- Check thermostat wiring: Remove the thermostat from its base and verify that all wires are firmly connected and match the Luxaire wiring diagram for your communicating or conventional stat.
- Inspect humidity sensor: If your system uses a separate indoor humidity sensor, verify its wiring and replace it if corroded or physically damaged.
- Disable unused features: If no humidity sensor is installed but the board is configured for one, have a technician reconfigure the Luxaire control to disable that input.
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Repair Difficulty
Medium
3/5
Required Part
Indoor Humidity Sensor
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