H2
Coleman
Defrost / Outdoor Coil Temperature Sensor Fault
Coleman air conditioner displays H2 and may not start the compressor in heating or cooling mode (for heat pump models).
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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
Failed outdoor coil sensor on Coleman heat pump, Sensor not attached to coil, Damaged sensor wiring, Faulty defrost control board
How to Fix / Troubleshooting
Safety: Turn OFF power at the outdoor disconnect and breaker before opening the condenser panel.
- Locate coil sensor: On Coleman heat pumps, the defrost sensor is typically clipped to the outdoor coil tubing.
- Check attachment: Ensure the sensor is firmly clipped to the coil. Reattach if loose.
- Inspect wiring: Follow the sensor leads to the defrost/control board. Look for damage or loose connectors.
- Test sensor: With power OFF, disconnect the sensor and measure resistance. Compare to the Coleman temperature/resistance chart. Replace if out of spec.
- Board evaluation: If the sensor is good, the defrost control board may be faulty and require replacement.
- Reset system: Restore power and clear H2 by cycling the thermostat. Verify normal heat pump operation.
Warning: Do not bypass defrost controls; this can damage the compressor and coil.
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Repair Difficulty
Hard
4/5
Required Part
Outdoor Coil Temperature Sensor
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