Ariston
Intermittent Lockout / Unstable Operation
Furnace frequently locks out and requires manual reset, with no consistent error code.
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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
Loose electrical connections, Intermittent sensor failure, Fluctuating gas pressure, Control board fault
How to Fix / Troubleshooting
Safety: Do not repeatedly reset a furnace that frequently locks out; identify the cause.
- Record conditions: Note when lockouts occur (cold start, windy weather, high demand) to help pinpoint the issue.
- Check connections: With power OFF, gently press on all plug-in connectors on the control board, sensors, and gas valve to ensure they are seated.
- Inspect for moisture: Look for condensation or leaks dripping onto electronics or sensors.
- Professional diagnostics: An Ariston technician can read stored fault history and monitor live data to identify the intermittent cause.
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Repair Difficulty
Hard
4/5
Required Part
Control Board (PCB)
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