Frozen condensate pipes
During recent winters the UK has experienced prolonged spells of extremely cold weather. This resulted in a significant increase in the number of calls to boiler manufacturers and heating engineers from householders with condensing (high efficiency) boilers where the condensate drainage pipe had frozen and become blocked with ice, causing the boiler to shut down. In the vast majority of cases such problems occur where the condensate drainage pipe is located externally to the building for some part of its length.
What to do if you suspect your condensate pipe may have frozen:
If your boiler has stopped working, it may show a fault code, some of these are:
Worcester-Bosch boilers often show EA, or D5 or blue flashing light.
Vaillant boilers often show F27 F28 F29
Baxi boilers often show E133
These codes can mean other problems, but whilst temperatures remain extremely low, it is worth checking your condensate pipe is not frozen.
Warm the area of pipe you believe to be affected, use either warm water, or hot
water bottle, do not use boiling water for your own safety, do not do this if
the pipe is at high level, no one wants to be up a ladder in icy conditions
with hot water!
If thawing does not resolve the problem call your engineer straight away, do not continue to try to use your boiler. Call as early as possible, we are busy during these conditions, so the more notice the better we can plan our diary.