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    Boiler not firing up while system is still hot

    Any plumbers out there have any idea why our boiler won't fire up (it just keeps clicking as though it is trying to start) straight after the central heating has been on? Seems to be for both the hot water and the heating, but all seems fine if you wait until the radiators have cooled slightly.
    Thanks.

    25 Comments

    could it be the water is to the set temperature ?

    Overheard a conversation in the Post Office today. May well be the condensation tube has frozen due to the weather in which case a blowtorch (or lighter!) willl do the trick. Apparently plumber in question had done 9 in one day yesterday. Hope this helps.

    Original Poster

    Deanos - Not sure that I know what you mean - the hot water (from the taps) runs cold while it is clicking away.
    Edited by: "Alfie!" 29th Nov 2010

    re the last... blowtorch... gas supply... recipe for disaster mate if you don't know what you are doing

    Original Poster

    n1ck09

    Overheard a conversation in the Post Office today. May well be the … Overheard a conversation in the Post Office today. May well be the condensation tube has frozen due to the weather in which case a blowtorch (or lighter!) willl do the trick. Apparently plumber in question had done 9 in one day yesterday. Hope this helps.


    Any idea where it may be so that I could try it - it has been doing it for a few days at least (not sure if it coincided with this cold snap, but it may do)

    Original Poster

    BlackCloud

    re the last... blowtorch... gas supply... recipe for disaster mate if you … re the last... blowtorch... gas supply... recipe for disaster mate if you don't know what you are doing


    True. If it is visibly or obviously frozen then at least I would have some idea though - and just ignore the problem until it warms up again.

    The condensate pipe is made of plastic, blowtorch and plastic isnt a good combination.

    Alfie it's the white plastic pipe poking out your house
    Edited by: "pinkleponkle" 29th Nov 2010

    Afraid not, as I said just overheard, perhaps someone else knows more than me.

    Alfie!

    Deanos - Not sure that I know what you mean - the hot water (from the … Deanos - Not sure that I know what you mean - the hot water (from the taps) runs cold while it is clicking away.



    Sorry, i meant has the water thats in the system reached the temperature eg 60c

    When our boiler gets to the desired heat the boiler will just click until its cooled down and then it will come on and start heating again

    Doubt if its a blockage or frozen if it repairs itself once it has cooled down more likely a board failure or maybe a thermocouple if you are lucky. Have you googled problems on the model

    Edited by: "newbie1001" 29th Nov 2010

    also if your condensate pipe is blocked with ice then the boiler will go to lockout.

    newbie if it was a thermocouple it wouldnt repair itself as the pilot would be out and require manual intervention.
    Edited by: "pinkleponkle" 29th Nov 2010

    Alfie!

    Deanos - Not sure that I know what you mean - the hot water (from the … Deanos - Not sure that I know what you mean - the hot water (from the taps) runs cold while it is clicking away.



    I had a boiler that did this when the heat exchanger broke - was a costly fix to replace it. Hope this is not your problem too.

    edit - you say the water will heat up - mine didn't so ignore heat exchanger fail.
    Edited by: "J9STL" 29th Nov 2010

    Original Poster

    pinkleponkle

    also if your condensate pipe is blocked with ice then the boiler will go … also if your condensate pipe is blocked with ice then the boiler will go to lockout.newbie if it was a thermocouple it wouldnt repair itself as the pilot would be out and require manual intervention.


    I hope that doesn't mean it is a board failure then... I quite 'liked' the sound of a frozen condensate pipe in comparison.

    Im no expert but it could be a faulty thermostat.

    It could be clicking as it thinks its already at the right temperature.

    If the condensation pipe is outside they have been freezing which causing boilers to cut out . This is the message i got from EAGA today when i phoned about problems with my boiler they said if accessable to pour warm water not boiling over the pipe ,or use hot water bottle or warm towels until it defrosts then reset the boiler.

    Original Poster

    I have tried googling it, and there seem to be a number of possibilities, including a waterpump not being fast enough - will carry on searching. There is a copper pipe going to the outside, and no sign that there is anything (ie water) coming out of it, so maybe it is frozen, but pinkleponkle implies that this would cause the boiler to lockout (?) whereas ours just seems to start working again when it is cooled down.
    Thanks for all the feedback and ideas.

    the copper pipe is the expansion relief pipe, it isnt supposed to have water coming out of it.

    Make and model of boiler?

    Original Poster

    'Icon 23t' - it is at least 15years old.

    could be a number of things to be honest, faulty flow sensor, diverter valve.....you really need to have an engineer look at it, as it's hard to determine the fault just from the info given.

    Original Poster

    souljacker

    could be a number of things to be honest, faulty flow sensor, diverter … could be a number of things to be honest, faulty flow sensor, diverter valve.....you really need to have an engineer look at it, as it's hard to determine the fault just from the info given.


    I think I agree now! With some help from Google, I am pretty confident that I know very little about how boilers work! Most of the threads I have ploughed through suggest the same as you, or a problem via an over-heat stat, perhaps due to a faulty pump or air lock.
    Thanks again to all for their comments and contributions.

    Original Poster

    Just as a follow-up, an engineer has been and had a look - it may be the PCB, but first off they have tried turning the central heating maximum temperature down and that appears to be working so far!.. Fingers crossed.

    Where is the boiler?

    Original Poster

    Under a worktop in the kitchen - so shouldn't be frozen or anything.

    Original Poster

    Final update. An engineer came out again - apparently, and as far as I can confirm second hand, it was the smaller PCB (that is just before the spark electrodes I think). He has replaced it with one that he had in the van, and now everything is working fine!

    Thanks for the previous replies.

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