A14
Riello
Safety Sequence Error
Burner indicates lockout due to incorrect sequence of safety inputs (e.g., limit opens at wrong time)
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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
Miswired safety devices, Faulty high limit or pressure switch, Control box logic fault, Intermittent wiring connection
How to Fix / Troubleshooting
Safety: Power off and verify wiring against the official Riello and furnace wiring diagrams.
Steps:
- Verify wiring order: Ensure that all safety devices are wired in series in the correct order to the burner control terminals.
- Check for intermittent opens: Gently move wiring harnesses while checking continuity to detect loose connections.
- Replace suspect switches: If a limit or pressure switch opens erratically, replace it.
Complex sequence errors should be handled by a trained technician familiar with Riello controls.
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Repair Difficulty
Hard
4/5
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