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EddieB

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I have a Fully pumped S plan with two zone valves HW & CH, when the programmer is off, the room stat is turned down as far as it will go the heating still comes on, I'm assuming the CH 2 port valve is faulty and must be letting voltage through to the pump/ boiler. I have two valves a drayton ZA5 and an unidentifiable Range, if it is a faulty valve can I just remove the body and leave the base in place, has anybody else experienced this issue before and confirm my thought regarding the faulty valve? Cheers
 
Heating switching on regardless {filename} | ElectriciansForums.net


[/ATTACH] there you go, follow the wiring diagram.it could be the controller needs changing. Are you falimarised with heating systems.

Heating switching on regardless upload_2017-9-10_10-53-45 - EletriciansForums.net
 
Last edited:
put programner and thermostat in the off positions for both heating and hot water, separate the oranges of both valves, test which orange has voltage, once you've confirmed which one has voltage check if there is voltage on the brown of the same valve. If there is no voltage on the brown but voltage on the orange then the micro switch is stuck closed between grey and orange.

I doubt it's the programmer as the thermostat would have to also be faulty as they are in series.

Double check the CH valve isn't manually open as some valves have this facility. If the valve isn't seized open then you could get a replacement head as the micro switch is stuck. If the valve is seized then you will need a plumber to replace it.
 
Guys
All sorted it turns out the micro switch on the Heating Valve was sticking ( Grey & Orange) I operated the valve a couple of times and hey Presto it now works.
Thank you to all of you who responded .
 
put programner and thermostat in the off positions for both heating and hot water, separate the oranges of both valves, test which orange has voltage, once you've confirmed which one has voltage check if there is voltage on the brown of the same valve. If there is no voltage on the brown but voltage on the orange then the micro switch is stuck closed between grey and orange.

I doubt it's the programmer as the thermostat would have to also be faulty as they are in series.

Double check the CH valve isn't manually open as some valves have this facility. If the valve isn't seized open then you could get a replacement head as the micro switch is stuck. If the valve is seized then you will need a plumber to replace it.
All sorted, thank you for your response
 
if faulty is easy to replace, has long you have shut of valves near it .but I if I was you
I would get a plumber in having to drain down and put in central heating additive
like fornix inhibitor .if you replace it you will be back within the 12months.
 
just love those bare links at the top. waiting to give the unwary a bite.
 
Wow are those un-insulated links for real?
Yep.
Owner swears it was done by a proper Spark and wouldn't blame Mr Plumber (I admit that I did try to get him over that line). Even more badness - the single retaining screw for the wiring centre cover was missing - so half asleep first thing I opened the cupboard, bumped the box and the cover fell off, revealing all its naked glory. :eek: . They've got brooms and stuff in there and it's just luck no-ones been hurt. It also has a 3kW immersion running on 1mm flex from a 13A fcu. It was on when I got there (don't ask me why... ) and the cable and fcu were toasty. Freed up the CH valve, took fuse from immersion, secured the wiring centre top and beat a hasty retreat for today. I'll go back later in the week and make it presentable.
 

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