F5
MrCool Discharge Pipe Temperature Sensor (T5) Fault

Indoor unit shows F5; system may have difficulty controlling temperature or may shut down.

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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

Open or shorted T5 sensor, Sensor loose on discharge line, Damaged sensor wiring near compressor

How to Fix / Troubleshooting

Safety first: Turn off power and allow the outdoor unit to cool before touching any refrigerant lines.

Steps:

  • Locate T5 sensor: The discharge temperature sensor is clipped to the small-diameter hot gas line leaving the compressor.
  • Inspect mounting: Ensure the sensor is firmly attached and insulated as originally installed.
  • Check wiring: Look for heat-damaged or brittle wires near the compressor.

Repair: Replace the T5 discharge sensor if damaged. If the sensor is good but F5 persists, the outdoor PCB may be misreading it and require replacement by a technician.

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Repair Difficulty

Medium 3/5

Required Part

Discharge Pipe Temperature Sensor (T5)
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