Rheem
Electrical Short or Overload in Boiler
Boiler frequently trips the household circuit breaker or blows fuses
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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
Shorted pump motor, Shorted fan motor, Damaged wiring harness, Faulty main control PCB
How to Fix / Troubleshooting
Safety first: Do not repeatedly reset a breaker that trips immediately. Risk of fire or shock exists.
- Step 1 – Visual inspection: With power off, inspect internal wiring for melted insulation, pinched wires, or signs of arcing. Repair or replace damaged wiring.
- Step 2 – Isolate components: A technician can disconnect the pump, fan, and other loads one at a time to identify which component causes the breaker to trip when re-energized.
- Step 3 – Test motors: Measure resistance to ground on pump and fan windings. Replace any motor with low insulation resistance or shorted windings.
- Step 4 – PCB evaluation: If all loads test good, the main control PCB may have an internal short and require replacement.
Warning: Electrical troubleshooting inside the boiler should be performed by qualified personnel.
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Repair Difficulty
Professional Required
5/5
Required Part
Circulation Pump
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