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No hot water from combi boiler

When turning on hot water taps we only get cold water out the central heating is working fine but when we turn hot water on the piolet light goes out, on the boiler it says the pressure should be between 1 & 2 however it over 2 and when heating goes on it seeems to go to nearly 3 we cant open the boiler.

it is a heatline combi boiler

can anyone hel please

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  • katymac Feb 01, 2009

    We have the same problem! I've googled the problem and found lots of Q&As on the subject. I'll summarize them to save you the time: The most frequent suggestion given is that it could be the diaphragm (connected to the flow switch) that needs replacing. Not sure if this can be checked visually. Other suggestions I've found is the diverter valve could be stuck in the central heating position so it isn't switching to hot water -- this could be caused by lime scale. 
    Someone else said too much pressure in the system could cause the blow off valve to blow -- I've no idea what that might be. Finally, one other poster has said it could be the air pressure switch and another said the thermocouple. 
    Good luck! We are waiting on a service engineer to call. 

  • Anonymous Mar 16, 2014

    What do the flashing lights mean combi boiler

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I have a combie bolier when i turn the hot water taps on only cold water comes out central heating working fine can any one give some advise ?and can i fix it myself.

Posted on Mar 20, 2009

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