F6
Fujitsu Indoor Heat Exchanger Outlet Temperature Sensor Fault

Indoor unit displays F6, unit may not control coil temperature correctly

Advertisements

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.

Advertisements

Possible Causes

Open or shorted outlet coil thermistor, Sensor detached from coil outlet pipe, Damaged wiring harness, Indoor PCB sensor input failure

How to Fix / Troubleshooting

Safety first: Disconnect power before accessing the indoor coil and piping.

  • Locate outlet sensor: This thermistor is typically clipped to the copper pipe at the outlet of the indoor heat exchanger.
  • Check attachment: Ensure the sensor is firmly attached and has good thermal contact with the pipe.
  • Inspect wiring: Look for pinched or cut wires where they pass through metal brackets. Repair or replace as needed.
  • Resistance test: Measure resistance and compare to Fujitsu's temperature-resistance chart. Replace the sensor if readings are out of spec.
  • PCB evaluation: If a new sensor does not resolve F6, the indoor PCB may be faulty and should be replaced by a technician.
Advertisements

Repair Difficulty

Medium 3/5

Required Part

Indoor Coil Outlet Thermistor
Check Price on Amazon

We may earn a commission from links on this page.

Advertisements