Main
Intermittent Lockout (Underlying Fault Not Resolved)
Boiler repeatedly locks out and needs frequent manual resets
Advertisements
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.
Advertisements
Possible Causes
Marginal ignition performance, Partially blocked flue or condensate, Unstable gas supply, Overheating due to poor circulation
How to Fix / Troubleshooting
Safety: Do not continue to reset a boiler that repeatedly locks out; this can be unsafe and may damage components.
- Note error codes: Observe and record any specific error codes shown before or after lockout to guide diagnosis.
- Check basic conditions: Confirm adequate system pressure, clear flue terminal, and that all radiators are open.
- Service overdue: If the Main boiler has not been serviced annually, arrange a full service including burner, heat exchanger, and safety checks.
- Engineer tasks:
- Perform combustion analysis and adjust gas valve if required.
- Inspect ignition and flame sensing components.
- Check pump performance and system cleanliness.
Advertisements
Repair Difficulty
Hard
4/5
Advertisements