I, like half of the UK right now, have got a problem with my boiler, and like the majority of those people, I understand it to be a problem with a frozen/blocked condensate pipe.

I've tried doing what I can to heat up the outside pipe, tried refilling the pressure, I've tried as many things as a layperson is likely to, and the occasion that I have been able to get hold of a plumber, they're inundated with calls, the only people I've got in touch with gave me conflicting suggestions, one guy said all I had to do was disconnect the condensate pipe from the boiler, let the excess water out, but that would let it heat up again, the other guy told me to absolutely not do that

I know this isn't the absolute use for SO, I'm just trying to fix my damn heating

Boiler is a Worcester Greenstar 25i, error code is 227 which says it cannot ignite the flame

been told to disconnect this

  • Frozen condensate is one possible cause for that error. If there is a place near the boiler where you can disconnect it, and pour some water down it you could confirm or rule it out. If the water comes out the outside end of the pipe, it's not frozen. If it backs up out your end, it's blocked and you have to look for other reasons.
    – jay613
    Dec 16, 2022 at 19:20
  • "Let the excess water run out" is a terrible idea. If you disconnect the pipe it should only be to help you confirm or rule out the pipe as the problem, not to try to bypass it.
    – jay613
    Dec 16, 2022 at 19:21
  • Thanks, this is just what I wanted to know, I'm not aiming to fix this myself, but you can't get hold of a plumber at this point until some point next week, there isn't a lot of options aside from wait and hope, and to paraphrase themselves, this is all they'd be doing if they came round, that's literally what one of them said, but I just wanted another opinion because I don't want to make it worse Dec 16, 2022 at 19:54
  • If it is frozen you could look for ways to prevent that. Reroute the pipe so it's more inside and less outside or wrap the outside part in foam pipe insulation, or if that's not enough, in electrically heated tape.
    – jay613
    Dec 16, 2022 at 21:57
  • 1
    It's currently routed through the loft of the garage, and only about 2 feet of it is exposed outside, but I'm not sure what part of it has frozen Dec 16, 2022 at 22:41

1 Answer 1


Failure to ignite can be caused by a blocked condensate pipe.

If you are going to disconnect the pipe, you need to work out where the water is going to go, as you can expect some water to pour out from the boiler. The water is slightly acidic, but not terribly dangerous.

As for safety, there's something electrical directly below that pipe. So think carefully how you are going to do it.

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