How to Fix a Frozen Boiler Condensate Pipe (269 views, 1 replies)
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Ignition lockout — frozen condensate pipe
freeheatingadvice.com/articles/i...
"In extremely cold weather the condensate passing along these pipes may freeze. This is a particular problem when the temperatures outside stay below zero for several days. If the condensate freezes it will block the pipe. The condensate will back up into the boiler and the boiler may make loud gurgling or rumbling noises. The boiler will lock out and may show flashing lights or flashing error codes. If the condensate pipe stays frozen, resetting the boiler will not solve the problem. It will simply lock out again.
Fault codes vary from manufacturer to manufacturer so you may need to read the User Instructions for the boiler. If the fault says it is an ignition fault, or that the boiler fails to stay alight, and it is freezing outside, there’s a good chance it’s caused by a frozen condensate pipe."
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In very cold weather and when the temperature is below freezing, boiler condensate pipes can become blocked with ice, this blockage can prevent your heating system from working correctly. Watch this video from Viessmann to learn how to identify an issue with a frozen condensate pipe and what you can do to fix it.