H1
American Standard
High Discharge Temperature / Overheat Protection
Heat pump displays H1 and shuts down heating operation
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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
Restricted outdoor airflow, Dirty outdoor coil, Low refrigerant charge, Faulty discharge temperature sensor on American Standard compressor
How to Fix / Troubleshooting
Safety first: Turn off power to the outdoor unit before cleaning or inspection.
- Clean outdoor coil: Remove debris and gently hose off the coil from inside out. Ensure at least 2 feet of clearance around the unit for proper airflow.
- Check fan operation: Confirm the outdoor fan runs at full speed in heat mode. A slow or non-running fan can cause high discharge temperatures.
- Inspect discharge sensor: The discharge temperature sensor is usually strapped to the compressor discharge line. Ensure it is secure and the wires are intact.
- Call a technician for refrigerant issues: If H1 recurs after cleaning and verifying fan operation, a professional should check refrigerant charge and system pressures.
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Repair Difficulty
Hard
4/5
Required Part
Discharge Temperature Sensor
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