E31
Rheem
Line Frequency / Power Quality Fault
Heater intermittently shuts down with E31 during 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
Unstable power supply, Generator power with poor regulation, Control board sensitivity to frequency variations
How to Fix / Troubleshooting
Safety First: Disconnect power before inspecting wiring.
- Check power source: If running on a generator or inverter, verify it provides stable voltage and 60 Hz frequency (or local standard). Poor-quality power can cause E31.
- Inspect wiring runs: Long undersized runs can cause voltage fluctuations. Upgrade wiring to the correct gauge if necessary.
- Install surge protection: Consider adding a whole-house or dedicated surge protector to protect the heater's electronics.
- Consult electrician: Persistent E31 indicates a power quality issue that should be evaluated by a licensed electrician.
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Repair Difficulty
Medium
3/5
Required Part
Main Control Board
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