A10
Riello
Low Voltage / Power Supply Fault
Burner control indicates lockout due to low or missing line voltage 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
Undersized wiring or long cable run causing voltage drop, Loose electrical connections at terminal block, Faulty breaker or power switch, Shared circuit with heavy loads
How to Fix / Troubleshooting
Safety: Turn off the main breaker before tightening any electrical connections.
Steps:
- Measure voltage: With a multimeter and power on, verify that the burner receives the rated voltage at startup and during operation. If voltage drops significantly, investigate the supply.
- Inspect terminals: Turn power off and tighten all screws on the Riello burner terminal strip and furnace junction box. Look for discoloration or melted insulation.
- Dedicated circuit: Ensure the furnace is on a dedicated circuit not shared with large appliances that can cause dips.
If supply voltage is consistently low, an electrician should correct the wiring or panel issues.
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Repair Difficulty
Medium
3/5
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