Kelvinator inverter split AC displays F3 and may stop heating or cooling.

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

Failed outdoor ambient thermistor, corroded connector due to weather exposure, damaged sensor cable, outdoor PCB sensor circuit failure

Safety: Switch off power at the outdoor isolator or breaker.

Steps:

Locate sensor: The outdoor ambient sensor is usually clipped near the outdoor coil or on the unit frame, exposed to outside air.
Inspect physically: Check for broken sensor body, UV-damaged wires, or corrosion at the connector.
Test resistance: Use a multimeter to verify the thermistor value at ambient temperature. Replace if open/shorted or out of range.
Secure routing: When replacing, route the new sensor away from sharp edges and hot discharge air.

Medium 3/5

Outdoor Ambient Temperature Sensor

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