H2
Airwell Over-defrost or Defrost Protection Fault

Indoor unit shows H2; heating stops or is very weak; unit may frequently enter defrost.

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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

Defective defrost sensor, Incorrect sensor placement, Outdoor PCB defrost algorithm fault, Low refrigerant causing abnormal coil temperature

How to Fix / Troubleshooting

Safety: Turn off power before working on the outdoor unit.

Steps:

  • 1. Check outdoor coil and sensor: Inspect the coil and defrost sensor as in F6. Ensure the sensor is correctly attached and wiring is intact.
  • 2. Observe defrost frequency: If the unit defrosts very frequently (every few minutes), this may indicate sensor or refrigerant issues.
  • 3. Clean coil: A dirty coil can cause incorrect temperature readings. Gently clean the coil with a soft brush or low-pressure water.
  • 4. Professional diagnosis: If H2 persists, a technician should check refrigerant charge, sensor readings, and defrost control logic on the PCB.
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Repair Difficulty

Hard 4/5

Required Part

Outdoor Defrost Temperature Sensor (NTC)
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