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www.ultimatehandyman.co.uk Forum Index -> Plumbing Forum
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samantha
Junior Member
Joined: 23 Sep 2008
Posts: 38
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 Posted: Sat Sep 27, 2008 9:07 am Post subject: |
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oh.............. and no heating this morning either  HW yes but CH a big ZERO!!!  |
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thescruff
Senior Member
Joined: 10 Mar 2008
Posts: 5665
Location: Bath
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| Posted: Sat Sep 27, 2008 9:23 am Post subject: |
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The first thing you to establish whether the valve is getting a signal.
The programmer call for heat.
The stat is just an inline switch which cuts the signal at a given temperature.
The valve opens if both the above are asking for heat, so in the heating only mode power is put on the grey wire which fully opens the valve, and at the same time sends a signal to the boiler and pump via the Orange wire.
You need to go through the sequence to find where the signal is breaking down.
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samantha
Junior Member
Joined: 23 Sep 2008
Posts: 38
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| Posted: Sat Sep 27, 2008 3:47 pm Post subject: |
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Hi, well these are the readings i got with both cylinder and wall stat set to Max.
CH to constant on + HW off on programmer (Pump & boiler not running when switched to this)
Valve reading (in honeywell sundial wiring box)
White = .48
Orange = 19.4
Blue = .47
Grey = 244
Green/Yellow = .01
Programmer readings from sundial wiring box, read at the same time:
HW off connection = 242
HW on connection = 19.4
CH on connecton = 242
HW + CH set to constant (Pump and boiler did fire up at this setting)
White = 6.14
Orange = 241
Blue = .059
Grey = 119.5
Green/Yellow = .10
Programmer readings read:
HW off = 119.4
HW on = 242
CH on 241
Any ideas now scruff????? |
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thescruff
Senior Member
Joined: 10 Mar 2008
Posts: 5665
Location: Bath
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| Posted: Sat Sep 27, 2008 4:54 pm Post subject: |
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Hi Again.
Yes as there is no power to the white the problem is between the room stat and the receiver.
What model is the receiver.
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samantha
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Joined: 23 Sep 2008
Posts: 38
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samantha
Junior Member
Joined: 23 Sep 2008
Posts: 38
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| Posted: Sat Sep 27, 2008 8:30 pm Post subject: |
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| Just to also say, i have the older style RF1 .. the same as the one pictured in this link. It looks like there is a newer styled one out now. Looks like they've kept the SCR receiver the same though. |
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thescruff
Senior Member
Joined: 10 Mar 2008
Posts: 5665
Location: Bath
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| Posted: Sat Sep 27, 2008 8:40 pm Post subject: |
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Are you certain you put the wires back in the same order.
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samantha
Junior Member
Joined: 23 Sep 2008
Posts: 38
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| Posted: Sat Sep 27, 2008 8:44 pm Post subject: |
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Yes. For sure. Here is a link picture of the wiring centre every component is wired in to : http://content.honeywell.com/UK/homes/FAQ/wircenop.pdf
As you can see, it tells you what colour wire to attach to which terminal when it comes to the valve. |
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thescruff
Senior Member
Joined: 10 Mar 2008
Posts: 5665
Location: Bath
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| Posted: Sat Sep 27, 2008 8:57 pm Post subject: |
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Couple of things to try.
Take the head of the valve off the body and try the heating only.
If that don't work remove the wires from the stat in the wiring center and make them safe, link 1 and 3 and try it.
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samantha
Junior Member
Joined: 23 Sep 2008
Posts: 38
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| Posted: Sat Sep 27, 2008 9:03 pm Post subject: |
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Sorry........ as you've guessed im not an expert  so want to clarify if ok with you, before i get going on it in the morning . Im to take the head off the valve but still leave it wired in to centre. Then put demand for heating on only. Then what am i looking out for?? |
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thescruff
Senior Member
Joined: 10 Mar 2008
Posts: 5665
Location: Bath
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| Posted: Sat Sep 27, 2008 9:18 pm Post subject: |
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To see if the boiler and pump comes on in both case.
By removing the head you are checking the valve body to see if it's sticking and therefore not reaching the micro switch.
By removing the stat wires and linking them across you are checking if the stat or receiver is the problem.
I will say it's a lot easier if your stood in front of the problem.
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samantha
Junior Member
Joined: 23 Sep 2008
Posts: 38
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| Posted: Sat Sep 27, 2008 9:26 pm Post subject: |
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Right im clear as what to do with the stat wires and what to do there.
Now when i take the head off, am i looking out for movement up inside the body of the head itself, where the spindle from the plate of the valve fits in to??? (excuse my teminology.... hope you know what im referring to??) And am i also looking to see that spindle on the plate on the valve itself is moving freely???
Sorry if i sound completly stupid.... just want to make sure i do it perfectly right ...... |
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thescruff
Senior Member
Joined: 10 Mar 2008
Posts: 5665
Location: Bath
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| Posted: Sat Sep 27, 2008 9:33 pm Post subject: |
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You could check the spindle is moving freely, but you are just checking to see if the boiler and pump fires up.
Couple of other thoughts;
Is there any led's lit on the scr and what colour are they, have you tried pressing and holding the override button.
one more task, take all 4 batteries out of the room stat and wait for the screen to clear, replace the batteries and re-set the temp.
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samantha
Junior Member
Joined: 23 Sep 2008
Posts: 38
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| Posted: Sat Sep 27, 2008 9:50 pm Post subject: |
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Right that makes sense.... shall get on with that first thing and let you know what i find.
As for the SCR, the green light is on iwhen the heating is calling. Although i could of sworn that the green light was on the other day despite no heat calling but i could of been wrong, so wouldnt base anything on that. It was just the once i saw it like that. As for the batteries, i replaced those (right drawer closed first etc) and then set the stat and receiver up. Putting it in to learn mode etc Dont have the instructions on me but have them around and followed them. The only thing i did not do is hold the receiver stat unit near to the receiver unit when i did it (as advised in the instruction leaflet). The receiver unit is in the cupboard with the pump and tank and controller etc and the stat itself is down stairs in the hall. As the lights did change as they should and the green light came on with the red light coming on every 4 or 5 mins saying it was receiving, i assumed i didnt have to remove the stat from the wall. Was i right to do that??? |
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samantha
Junior Member
Joined: 23 Sep 2008
Posts: 38
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| Posted: Sat Sep 27, 2008 9:53 pm Post subject: |
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| As for override button, i tried that earlier but nothing happened. However, the stat wasnt calling for CH at the time, so perhaps nothing would happen anyway?? In the morning, i will make sure stat is calling for heat and see again whether that overide button does anything. |
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Kind of relieved its not the valve. I originally changed the head and was dreading having to change the valve!!!!!!!!