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Vaillant boiler not heating water?

My vaillant cobin boiler is not heating water when the tap is on but is heating up fine for the central heating. THe only way to get hot water is to have the central heating on then you get a small amount but not enough for a shower. Any ideas on what it may be and how to mend it?

Thanks
Mark

Mark Ryder
June 2008
VaillantHeating, Home Heating SystemsHeating Water Tap
its definitely the diverter valve, had an engineer yesterday from storm heating, and he said it was checked it anc concluded the DHW need changing

Mark O
July 2008
Hi Mark,
Funny enough am Mark as well, and i am having the same problem, I had to rush out the shower this morning to switch on the the central heating just get the hot water running again. please tell me if it has been fixed and how?

Thanks
Mark O

Mark O
June 2008
sounds like scale or divert vavle gone or micro switch gone rember you must be corgi regs to paly with boilers

colin c.a.c gas heating
June 2008
Thanks, where would i find the dhw flow switch?

Mark Ryder
June 2008
the problem is the dhw flow switch is either crudded up or failed, clean or replace

T
June 2008

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