E201
GSW
Heat Pump Module Fault
GSW hybrid or high-efficiency electric water heater shows E201 and runs only on backup elements
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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 compressor, Faulty evaporator fan, Low refrigerant charge, Heat pump control board failure
How to Fix / Troubleshooting
Safety: Turn off power at the breaker. Heat pump systems contain refrigerant under pressure; do not open the sealed system.
- Check air filters and coils: Clean or replace intake air filters. Vacuum dust from the evaporator and condenser coils to improve airflow.
- Inspect fan operation: Restore power briefly and observe the evaporator fan. If it does not run or is noisy, the fan motor may need replacement.
- Listen for compressor: If the compressor does not start or makes loud noises, shut off power and contact a qualified heat pump technician.
- Professional service: E201 typically requires specialized tools and refrigerant handling certification. Arrange service to diagnose and repair the heat pump module.
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Repair Difficulty
Professional Required
5/5
Required Part
Heat Pump Module
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