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www.ultimatehandyman.co.uk Forum Index -> Plumbing Forum
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thescruff
Senior Member
Joined: 10 Mar 2008
Posts: 4658
Location: Bath
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 Posted: Sat Sep 27, 2008 10:10 pm Post subject: |
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Yes you the stat has to be calling or the heating won't work.
Does the red led flash for about 7 secs every 5 mins or so on the receiver.
Taking the four batteries out and letting the display die will reset the stat.
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samantha
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Joined: 23 Sep 2008
Posts: 38
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| Posted: Sun Oct 05, 2008 6:44 am Post subject: |
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Hi..... sorry for the delay in getting back. I've been ill this past week so the CH had to go on hold.
Funnily enough had CH all week but it failed yesterday morning and this morning too. As for the reset button on the receiver, i tried that this morning with stat and programmer both set for CH to be on, but nothing happened when i press reset. The receiver does have its green light on though at the moment with the red receiver one flashing on for a few seconds every 5 mins approx. Do you know whether reset button would work despite this, as im assuming it thinks its getting a signal already??
Right i'm about to link wires 1 & 3 on the stat inside the wiring centre as you suggested. Shall let you know how that goes in a little while.
Thanks again!! Samantha |
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samantha
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Joined: 23 Sep 2008
Posts: 38
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| Posted: Sun Oct 05, 2008 7:11 am Post subject: |
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| Hi again............just incase its significant i just went to connect wires and turned off the mains switch in the airing cupboard. This switch has 1 lead feeding in to it from the mains and then has 2 leads feeding out of it. One lead goes straight to the mains terminal in the wiring centre and the other lead feeds in to the Digistat SCR Receiver box and then the receiver box has a lead feding from it straight in to the stat terminal in the wiring centre. Well i thought i'd switch it back on to see if anything happened and it did. First red alarm light came on for a few seconds and then the green light came on then heating fired up and is still running. 240 v on white wire now whereas ealrier this morning the white wire was dead despite the stat and programmer calling for heat. Just wondered if that had any significance before i go ahead and link wires 1 & 3 ???? Thanks. |
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thescruff
Senior Member
Joined: 10 Mar 2008
Posts: 4658
Location: Bath
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| Posted: Sun Oct 05, 2008 8:26 am Post subject: |
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If it's working don't touch it.
Sounds like either a break in the wire, poor connection or dodgy switch
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samantha
Junior Member
Joined: 23 Sep 2008
Posts: 38
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| Posted: Sun Oct 05, 2008 11:24 am Post subject: |
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| Thanks scruff. Heating off now as its timed to stay off now until later this evening. I know its a million dollar question but do you still think its the stat or receiver seeing as the white goes through spells on not having 240V??? If so is it best for me to eliminate these by linking 1 & 3 together and seeing if it ever fails with these linked?? By linking 1 & 3 am i by passing the stat so if it works with these wires linked, its the stat thats at fault?????? |
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thescruff
Senior Member
Joined: 10 Mar 2008
Posts: 4658
Location: Bath
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| Posted: Sun Oct 05, 2008 12:02 pm Post subject: |
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If it's working then linking 1-3 will prove nothing, you can only test for a fault if there is one.
You could play around with the switch or whatever to see if it breaks down again, or leave it alone to see what happens.
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samantha
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Joined: 23 Sep 2008
Posts: 38
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| Posted: Sun Oct 05, 2008 2:08 pm Post subject: |
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Yes i can see what you are saying. How can i test a fauult when there is nothing going wrong just now.
Im slowly building up a picture of what seems to keep happening and when the fault occurs..... it seems that if the heating is being called for by the stat (flame showing on stat) when the programmer is timed to come on, then the heating switches on fine. However, if the programmer switches on at a time when the stat temp is showing as being met and not calling for heat, the heating obviously doesnt come on. But then if the temp drops and the stat then calls, or it could be i increase the temp on the stat so that it is calling for heat, then nothing happens....... dead as a doornail, so to speak! In other words CH only coming on by programmer so long as demand is there at time of programmer switching on. If i try and demand heat from the stat in anyway, then theres nothing.
Does this still fall in favour of the stat or reciever being faulty?????? |
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thescruff
Senior Member
Joined: 10 Mar 2008
Posts: 4658
Location: Bath
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| Posted: Sun Oct 05, 2008 2:15 pm Post subject: |
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No, it points to it being wired wrong.
With the heating on and working, what happens if you turn the stat down.
Assuming it turns off, then what happens if you turn it back up.
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samantha
Junior Member
Joined: 23 Sep 2008
Posts: 38
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| Posted: Sun Oct 05, 2008 5:20 pm Post subject: |
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| Once CH is up and running, if i turn the stat down the heating will go off just fine. If i then turn the stat back up, it will do absolutely nothing. CH will remain off. It will only then get going when the next scheduled time is set on the programmer. Again, the stat will have to be calling at the point programmed time kicks in for the CH to switch on. Shall i post a pic of the wiring centre on here so you can see what wires are going where? Will that help?? Thanks again for your help. |
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thescruff
Senior Member
Joined: 10 Mar 2008
Posts: 4658
Location: Bath
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| Posted: Sun Oct 05, 2008 6:11 pm Post subject: |
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That would be a good idea. 
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samantha
Junior Member
Joined: 23 Sep 2008
Posts: 38
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| Posted: Sun Oct 05, 2008 6:55 pm Post subject: |
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 right leave it to me. Will get one across asap. Just to also say that heating was due to come on at 6pm. Temp was met on the stat so heating remained off. Raised temp on stat but nothing once again! Thought id try the switch (in airing cupboard) of and on like i did earlier today. But this did not do anything either, other than reset the valve which i heard move over.... i think i read somewhere the valve repositions itself once mains are switched off and on. So hence the red alarm light on the receiver remained on (earier despite switching off and then on, signal was maintained and then heating fired up). I then thought this would be a good time to test the overide button on receiver. Green light came on and remained on along with the red alarm light, but nothing again. As i understand, overide should cause heating to come on until receiver is able to receive signal again. So i then had to reset stat in order to get receiver to receive the signal. Anyhow, shall get photos across in next half hour or so. |
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samantha
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Joined: 23 Sep 2008
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samantha
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thescruff
Senior Member
Joined: 10 Mar 2008
Posts: 4658
Location: Bath
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| Posted: Sun Oct 05, 2008 10:27 pm Post subject: |
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Can you post a pic of the wire in the SCR please.
Couple of points, I see they have use an earth wire for the hw on from the programmer, it should be sleeved
Also the main earth to the wiring center is not connected.
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samantha
Junior Member
Joined: 23 Sep 2008
Posts: 38
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| Posted: Mon Oct 06, 2008 6:14 am Post subject: |
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| Morning! Right leave it to me. I will post one later today once i get back home from work. Just to say that remember that i reset the stat last night after it failed to operate despite raising the stat temp or after trying to switch the mains switch off and back on again. Well when i reset it at about 7.30pm, i left the stat calling for heat. Well out of the blue at about 9.30pm ish, the system fired up and i had heaing unti 10pm, which is when the heating is timed to go off. Just thought i'd tell you in case it gives you any additional info. Thanks so much again. Will post the picture of inside of SCR when i get in later. |
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