BoilerTroubleshooting2026-02-26
Boiler Not Igniting in Cold Weather
Cold-weather ignition failure is often a frozen condensate pipe.
If your boiler won't ignite specifically during cold snaps, suspect the condensate pipe.
Common causes
A frozen condensate pipe is the leading cold-weather cause; low gas pressure and ignition faults can also appear.
What to do
Thaw the external condensate pipe with warm water and reset; insulate it to prevent recurrence.
Key takeaways
- Frozen condensate is the usual cause
- Thaw with warm water and reset
- Insulate the external pipe
- Other ignition faults need service
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