hot water won't turn off

[ShaunCorbs]

Now try your heating and hot water systems eg one at a time does everything work eg boiler come on pump etc

 

[Bradley31]

Turn the fused spur off and remove the grey wire and make safe (when you turn power back on this might be live)

I have just realised that we have had some underfloor heating out in downstairs in an extension and they wired it in next to the boiler. Could they have wired something in wrong there? We had noticed that our water all winter was really hot and we had been using a lot of oil. I think I have only noticed this issue when the heating finally went off. Maybe this has been happening since the new bit of wiring went in!

 

[moonlight]

Thats sounds like a possibility.

 

[ShaunCorbs]

Yep maybe do you have an extra port valve by the manifold?

 

[Bradley31]

Yep maybe do you have an extra port valve by the manifold?

I think the grey wire I have disconnected upstairs is the one in the frost stat in the screw without a number to the right of slot 4

 

[Bradley31]

Now try your heating and hot water systems eg one at a time does everything work eg boiler come on pump etc

Heating came on as it should with the programme. HW didn’t do anything

 

[ShaunCorbs]

Was the stat up ? You may have to lift it due to upto temp on the cylinder

 

[Bradley31]

Was the stat up ? You may have to lift it due to upto temp on the cylinder

Good thinking! Turned up the stat and it kicked in as it should! It’s a miracle 😀 still not convinced the the under floor heating is wired up right. Not sure what to do next now?

 

[ShaunCorbs]

Test the whole system eg leave it a couple of days and see how it goes / what doesn’t work

Don’t forget to turn the star back down to 60

 

[Bradley31]

Test the whole system eg leave it a couple of days and see how it goes / what doesn’t work

Don’t forget to turn the star back down to 60

Thanks for all the help today 😀

 

[ShaunCorbs]

Not a problem

 

[John.g]

I disconnected the orange wire and turned the power on. The MV still moved around and engaged the switch but the boiler didn’t fire up (I guess that’s what the orange wire does 🙂)

Good to see problem solved by removing the permanently live grey wire from terminal 8, think I have seen something like this on a outside grant boiler where the frost stat was incorporated in here, it may be worth tracing this wire sometime especially before winter sets in especially if you have a outside boiler, also would be interesting to see where the ufh is controlled from sometime.

 

[Bradley31]

Good to see problem solved by removing the permanently live grey wire from terminal 8, think I have seen something like this on a outside grant boiler where the frost stat was incorporated in here, it may be worth tracing this wire sometime especially before winter sets in especially if you have a outside boiler, also would be interesting to see where the ufh is controlled from sometime.

The UFH set up is in the pictures. The MV is on the pipe straight out of the boiler to the right. The controls are just above the boiler to the right. The UFH controls were just added to the CH controls that were already there. I am pretty sure something is wrong with this setup, nothing has been as it should since it was installed.
I have highlighted where the wire from upstairs that I disconnected goes on the frost stat
I have no idea what will happen come winter with the wire that I disconnected - or even it will have any affect on anything?

 

[John.g]

There also seems to be a brown wire in terminal 3 of the frost stat as well as the grey wire which presumably should be a switched live, wonder if that brown is the permanent live and should be somewhere else?.

 

[ShaunCorbs]

Yep looks like a frost stat issue looks like 3 wires into terminal 3 when there should be one

They’ve buggered the wiring up when they’ve added the extra 2 port /ufh

 

[Bradley31]

There also seems to be a brown wire in terminal 3 of the frost stat as well as the grey wire which presumably should be a switched live, wonder if that brown is the permanent live and should be somewhere else?.

The grey cable in terminal 3 is to the MV of the UFH. It also has a black cable from the cable coming from upstairs and the brown wire from the MV control box. The permanent live from upstairs that is disconnected is in the blank terminal to the right of terminal 4.

 

[ShaunCorbs]

Could you run a new wire from the ufh manifold to upstairs where the wiring centre is ?

 

[John.g]

The grey cable in terminal 3 is to the MV of the UFH. It also has a black cable from the cable coming from upstairs and the brown wire from the MV control box. The permanent live from upstairs that is disconnected is in the blank terminal to the right of terminal 4.

What is the stat's make/model?

 

[ShaunCorbs]

What is the stat's make/model?

Honeywell

 

[John.g]

Something like this?.