zone valve issues

[Andymav]

hi guys looking for some technical advice just replaced a drayton ZA5 actuator valve head as when the customer was putting the hot water on they were getting heating aswell the problem ive found is that the valve stays open constantly, when power is cut to the system it closes but when i switch the power back on it opens and doesnt shut so it allows hot water to flow to the heating aswell as the hot water circuit they have a vailiant ecotec boiler and a megaflow pressurised cylinder i cant figure out why the valve doesnt close off the flow to the heating


andy

 

[ManchesterGas]

180v difference as you will usually get around 50v when it's at rest

 

[mountainman]

Not on any zone valve that I've ever encountered.
Check the recent 'S' plan thread on this forum.

 

[Andymav]

 

[Andymav]

 

[Andymav]

it cant be a wiring issue because the valve was wired the same way exactly so im assuming this vault has developed

 

[mountainman]

Nice piccie, I prefer Honeywell valves though, expensive but quality.

 

[Chalked]

it cant be a wiring issue because the valve was wired the same way exactly so im assuming this vault has developed

I would bet as this is a new propery the fault is wiring and has been there all the time.
Like others have said check that grey is live with the mains on and when calling for heat the brown becomes live. Also check the brown does not become live when other valves are calling. This would indicate a back feed.
a picture inside the junction box would be helpfull

 

[Andymav]

so you believe the zone valve itself maybe wired incorrectly

 

[phil the bucket]

I would bet as this is a new propery the fault is wiring and has been there all the time.
Like others have said check that grey is live with the mains on and when calling for heat the brown becomes live. Also check the brown does not become live when other valves are calling. This would indicate a back feed.
a picture inside the junction box would be helpfull

Could be a loose wire in the jb have u asked the customer if this has just started to happen or has always happened

Is the heating system getting luke warm or hot

Is it the rads in the bathroom just getting hot

 

[SimonG]

Pull it out and wire from scratch. That way you know the wiring is correct and then go from there.

 

[Andymav]

all the water is and heating is getting hot all rads heat up they movied into the property recently and when they used the boiler to get hot water the rads started heating up

 

[mountainman]

all the water is and heating is getting hot all rads heat up they movied into the property recently and when they used the boiler to get hot water the rads started heating up

Why did you wait until post 36 to mention this :banghead:

 

[Ermintrude]

No surprises! No need to rip it all out, get rid of the muppet box, bell each wire through so u know where each one goes and connect it up properly. Be a sparks fault!

 

[Ermintrude]

I would bet as this is a new propery the fault is wiring and has been there all the time.
Like others have said check that grey is live with the mains on and when calling for heat the brown becomes live. Also check the brown does not become live when other valves are calling. This would indicate a back feed.
a picture inside the junction box would be helpfull

Your must have a brilliant mind as think alike?

 

[dancinplumba]

View attachment 14704

That all looks dodgy wiring, the grey cables like that are a no no, needs re-doing

 

[phil the bucket]

Brown wire on the zone valve is prob on permanent live when it should be grey

 

[Andymav]

ok gonna head back there and re look at the wiring in a couple days il check the grey wire and brown wires as suggested and il take some more photos hopefully its acase of swapping some of the wires around

 

[Andymav]

by that i take it you mean put a normal wiring centre in

 

[Ermintrude]

by that i take it you mean put a normal wiring centre in

Don't like wiring centres with circuit boards / set out. Best ones in my mind are two gang back box with cover plate and a chock block inside.

 

[Andymav]

oh i know yes i agree much simpler.... gonna check the valve wiring first before i consider that