Honeywell AC shows F2 and may shut down cooling unexpectedly.

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

Defective evaporator thermistor, Sensor dislodged from coil, Damaged sensor wiring, Faulty sensor input on PCB

Safety: Disconnect power before opening the unit.

Steps:

Access evaporator: Remove front panel and filter to expose the cold evaporator coil.
Check sensor placement: Ensure the sensor is firmly attached to the coil. Reattach with the original clip or foil tape if loose.
Inspect wiring: Look for chafed or broken wires and repair or replace as needed.
Test and replace: Measure sensor resistance; replace the evaporator sensor if readings are abnormal. If F2 persists, replace the main control board.

Hard 4/5

Evaporator Temperature Sensor

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