Central Heating Question

My biasi combi boiler will only supply hot water when the heating is on.

When I try to switch the boiler to hot water only I am unable to, it just wont come on. The only way I get hot water is to switch the heating on. Does it need replacing or is a replacement switch all that is needed?

5 Answers

Best Answer

sounds like a divertor valve problem

Answered 9th May 2011

mt heating services

Member since 14 Apr 2011

It could be one of many problems.

Could be the diverter valve, a faulty thermistor making the boiler cut out before it can get to temperature, blocked (or partially blocked) heat exchanger, a fault on the PCB... The best way to get to the bottom of it will be to have a GSR engineer come out and have a look at it for you.

Answered 9th May 2011

Plumbheat Services

Member since 6 May 2011

diverter valve

Answered 9th May 2011

R L Whitehouse

Member since 17 Nov 2008

No feedback

Def diverted valve

Answered 29th Oct 2014

B.C Plumbing and Building Services

Member since 5 Sep 2013

Sounds like a diverter valve. When they fail it normally only allows hot water only. If there is no diverter valve in that model then it will be a split diaphragm that does the same job. A replacement can be sourced and then fitted by your local plumber.

Answered 9th May 2011

Thomas Michael Cassidy

Member since 21 Mar 2010

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