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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Plumbing Questions >> oil combi DHW problem https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1115550726 Message started by trevtherose on May 8^th, 2005, 12:12pm

Title: oil combi DHW problem
Post by trevtherose on May 8^th, 2005, 12:12pm

Hi, I've had an oil-fired combi (worcester heatslave12/14) installed 2 years. Recently when the hot water only setting is selected this also heats up all the rads even though the room thermotat is set to 0. Any ideas ?

Trev

Title: Re: oil combi DHW problem
Post by billythekid on May 8^th, 2005, 4:01pm

check your motorised/diverter valves, sounds like the one "blocking off" the heating rads is stuck open. Could also be faulty stat keeping it open, amongst other things. Start with the motorised valves...

btk