A19
Riello
Internal Control Self-Check Failure
Boiler shows lockout immediately on start with no fan or pump 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
Faulty main PCB, Incorrect supply voltage, Internal short circuit, Miswired components after service
How to Fix / Troubleshooting
Safety: Do not repeatedly reset a boiler that locks out instantly. Isolate power and investigate.
- Check supply voltage: Verify that the boiler is supplied with the correct voltage (typically 230 V AC) and that polarity and earth are correct.
- Inspect internal wiring: Look for obvious loose plugs, burnt connectors, or signs of water ingress on the PCB.
- Dry moisture: If condensation or leaks have reached the PCB, the source of water must be repaired and the board inspected or replaced.
- PCB replacement: A qualified technician should test and, if necessary, replace the main control PCB.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control PCB
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