E20
Utica
Power Supply / Line Voltage Fault
Boiler shows E20 and may shut down intermittently
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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
Low or high incoming voltage, Loose line connections, Shared circuit with heavy loads, Internal power supply failure on control board
How to Fix / Troubleshooting
Safety first: Turn off power at the breaker before opening the electrical junction box. Only qualified persons should test live voltage.
- Check line connections: Open the Utica boiler's electrical junction box and verify that the hot, neutral, and ground connections are tight and properly wire-nutted.
- Dedicated circuit: Ensure the boiler is on a dedicated circuit as recommended by Utica. Large motors or appliances on the same circuit can cause voltage dips.
- Measure voltage: A qualified person should measure line voltage at the boiler while it is operating. Compare to the nameplate rating (typically 120 VAC). Significant deviations can trigger E20.
- Surge protection: Consider installing a surge protector to protect the control board from future spikes.
- Board replacement: If supply voltage is stable but E20 persists, the internal power supply on the control board may be failing and require replacement.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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