Biasi
Intermittent Lockout
Boiler frequently locks out and requires manual reset, with varying or no error codes.
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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 gas supply, Intermittent PCB fault, Loose electrical connections, Faulty sensors with intermittent open/short
How to Fix / Troubleshooting
Safety: Do not repeatedly reset a boiler that locks out; this can mask a serious fault.
- Record conditions: Note when lockouts occur (e.g., DHW vs CH, weather conditions) to help diagnosis.
- Check ventilation and flue terminal: Ensure nothing intermittently blocks the flue (e.g., wind-blown debris).
- Inspect visible wiring: With power off, gently check that all plug-in connectors on the PCB and sensors are fully seated.
- Engineer investigation: A technician should perform a full diagnostic, including gas pressure checks, sensor tests, and PCB inspection, replacing any suspect components.
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Repair Difficulty
Professional Required
5/5
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