H2
Amana
Low Outdoor Temperature Lockout or Sensor Error
Heat pump displays H2; unit may shut down heating during very cold weather.
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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
Outdoor ambient sensor misreading, incorrect lockout settings, failed sensor, control board logic fault
How to Fix / Troubleshooting
Safety first: Turn off power to the outdoor unit before opening the control panel.
Steps to address H2 (low ambient/lockout):
- Check thermostat settings: On communicating systems, verify that low ambient lockout settings are appropriate for your climate.
- Test outdoor ambient sensor: Measure resistance and compare to the temperature chart. Replace if inaccurate.
- Inspect wiring: Ensure sensor leads are intact and not shorted to ground or each other.
- Replace control board: If sensor and settings are correct but H2 persists, the control board may need replacement.
Do not bypass low ambient protections; they prevent damage to the system in extreme conditions.
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Repair Difficulty
Hard
4/5
Required Part
Outdoor Ambient Temperature Sensor
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