How to Fix / Troubleshooting

Safety first: Isolate power at the outdoor disconnect before removing panels.

Step 1 – Inspect sensor placement:
- Locate the T2 sensor on the outdoor coil tubing.
- Ensure it is firmly clipped and in good contact with the copper tube.
Step 2 – Check cable condition:
- Look for cracks in insulation, UV damage, or rodent chew marks.
- Replace the sensor if the cable is compromised.
Step 3 – Replace sensor if needed:
- Disconnect from the PCB and install a new Hisense-compatible T2 sensor.
Step 4 – PCB diagnosis: If F2 persists with a new sensor, the outdoor PCB likely has a sensor input fault and should be replaced by a professional.

Indoor unit displays F2 and may stop during heating or defrost cycles.

Possible Causes