Boiler frequently locks out during very cold or very windy weather but runs normally otherwise.
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.
Possible Causes
How to Fix / Troubleshooting
Safety first: Lockouts protect against unsafe combustion. Do not modify venting without following Laars guidelines.
- Inspect vent termination: Ensure intake and exhaust are installed per Laars spacing requirements and are not in a wind tunnel or corner that traps exhaust.
- Clear snow and ice: Remove any snow or ice buildup around terminations.
- Monitor gas supply: If other gas appliances also struggle in cold weather, contact the gas utility.
When to call a professional: A technician may need to add vent terminations, wind hoods, or adjust combustion for stable operation.
Repair Difficulty
Required Part
We may earn a commission from links on this page.