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Room thermostat not turning off the heating


 
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Chilie

from United Kingdom

Joined: 07 Oct 2009
Posts: 4
Location: Lancashire,
United Kingdom

PostPosted: Wed Oct 07, 2009 8:55 pm Reply with quote

Hi - im trying to work out a problem with my central heating, the room thermostat (drayton RTS1) doesent switch off the heating, even if i turn it right down it has no effect. I can hear it clicking as it you turn it up and down but the heating remains on. I have tried replacing the room stat with the a new one - same make and model and the problem persists. The programmer is a Horstman C21 which replaced a Drayton LP241 about 2 years ok. It is a pumped system. I have noticed that if I remove the programmer from the wall completely and then replace it, it works for a while and then goes back to the same problem, I have checked the connections on the wiring and the contacts and i dont think this is the problem. My next thought is to try replacing the programmer but I was looking to see if anyone had any other thoughts before I spend my money.

Thanks
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bengasman

from United Kingdom

Joined: 28 Jan 2005
Posts: 30937
Location: London,
United Kingdom
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PostPosted: Wed Oct 07, 2009 8:59 pm Reply with quote

Replacing the horstman with a decent brand would not be a bad idea.
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gassafeengineer

from United Kingdom

Joined: 06 Oct 2009
Posts: 1883
Location: Cumbria,
United Kingdom
Thanked: 264 times

PostPosted: Wed Oct 07, 2009 9:07 pm Reply with quote

should be easy to fix


first you need to make sure you have 240V from your time clock CH ON to the roomstat then from your room stat (when stat is calling for heat) to the brown wire of the CH zone valve and you should now have 240 on grey or the orange wire of the zone valve (one of these will be to permanent live so will always have 240v and the other being the one to fire the boiler (switched live)

now with the heating demand off at the thermostat you should have 240 into your stat and 0v out of the stat leaving 0v to your brown wire and leaving 0v to either the orange or grey (depends on installers preference)

i think you will find in any circumstance you will have 240v on either grey or orange whicj indicates valve is stuck open and operating end switch permanently


hope this helps and isnt to confusing never was any good at writing descriptions
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doitall

from United Kingdom

Joined: 08 Jan 2005
Posts: 18754
Location: Bath,
United Kingdom
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PostPosted: Wed Oct 07, 2009 9:36 pm Reply with quote

Should be easier than that icon_rolleyes.gif

Microswitch sticking in an MV gets my vote.
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Chilie

from United Kingdom

Joined: 07 Oct 2009
Posts: 4
Location: Lancashire,
United Kingdom

PostPosted: Sat Oct 10, 2009 8:03 pm Reply with quote

Gents - thanks for all your ideas - I think i follow you with the wiring but im no electrician - I have a multimeter and the house is on circut breakers so i will have a fiddle and see if I can check the voltage without giving myself a shock!

Assuming one of the suggestions is correct and its either the micro switch or the valve - where do I find them - are we talking the gas valve inside the boiler?
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kevplumb

from United States of America

Joined: 18 May 2004
Posts: 23673
Location: Georgia,
United States of America
Thanked: 918 times

PostPosted: Sat Oct 10, 2009 8:06 pm Reply with quote

Login to view this image micro switch is inside the head icon_wink.gif
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