Display shows F1, unit may run but with poor temperature control

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

Drifted NTC sensor, Sensor not positioned in airflow, Loose sensor connector, Faulty indoor PCB ADC circuit

Safety: Turn off power before removing covers.

Steps:

Locate sensor: Find the room temperature sensor near the air intake grille. Ensure it is not buried in insulation or touching metal surfaces.
Reposition: Clip or tape the sensor so it is exposed to return air, not directly to the coil or casing.
Check connection: Reseat the sensor connector on the PCB.
Replace sensor: If F1 persists, replace the indoor ambient NTC sensor. If a new sensor does not resolve the issue, the indoor PCB may be defective.

Medium 3/5

Indoor Ambient Temperature Sensor (NTC)

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