Drayton Digistat SCR - appears to have been by passed

[M7R]

when we moved in to our new house I noticed there was no wall mounted thermostat, in the airing cupboard is conroller for a Drayton Digi stat which was fitted when the new boiler and Drayton controller was fitted back in 2008... I asked the previous owner where the wall mounted stat had gone (I was sure I had seen one when we viewed the house) and she said it had been by passed when the new boiler was installed and she was told to just contol the temp via the boiler.. now this seems odd as its appears that the stat was fitted when the system was installed so it must have been by passed later on ( she was getting on a bit, and was confused by a few things so it sound't suprise me)

I did buy a new wall stat before I knew it had been by passed, but I coud not get it to pair up, and now it seems it may have been by passed...(the box just has a red light for alarm lit up, it can be put into learn mode but this doesn't seem to work)

any idea how to un do the by pass? or am i going to have to pay some one? (I have a friend who is a sparky so I am sure we can re wire if we know how it should be done)

Karl

 

[Puddle]

Well it could have been by passed in a few ways,if you remove the receiver box there should be wires between 1 and 3 which is the switching loop,if you see two wires connected to 1 or 3 and the other terminal empty ,this is probably how it has been by passed,so split the wires between terminals 1 and 3 again,if wires are in place,trace wiring back

what boiler make model do you have ?

 

[M7R]

ahh brill I ill pop the cover off tomorrow eve (not dug into this yet as the wife shouts each time I take something apart lol)

Its a Visseman Vitodens 100W, I am trying to sort out a few other little issues with the set up at the moment so hopefully soon it will be all sorted.

 

[jtsplumbing]

What boiler do you have ? they may just have fitted the wireing loop back into the boiler, or they have linked wires together in the receiver, have you got information on how to pair them ??

 

[southcoastboile]

mabee even just lost its signal, never tried pairing a new stat with old reciever as they always come as a pair,i take it it is wireless, do you no what make and model it is, it is tricky to get them to reset as the procedure is long and explained very badly in the instructions on some models. If permanant red led then it has lost signal although as others have said may be linked out, they may have just put a link wire, if there is a wire in the reciever going to more than 1 terminal then remove it.

 

[M7R]

i have instructions how to pair them, so I know somethings not right. there are wires going into and out of the reciever so I am guessing it has been bypassed internally, (it has power going to it as the alarm light is lit up)

 

[M7R]

heres the wiring

which one should go back into 3?

 

[danielp]

your receiver and stat will have lost its signal, buy a replacement pack the new receiver will go onto the old back plate so no need to rewire pair them up as per instructions normally hold button 2 then 1 at the same time the red light will flash this is in learn mode with the battery draw out of the unit push it back in the red led will flash for a further 7 seconds it should now be paired, go to the boiler control wiring and no doubt they have wired a link in between permanent live and L1 remove it and job done, hope this helps

 

[M7R]

are you sure? as there should be a wire in port 3, (the 5th one along, where the screw is partly out and the clamp plate is bent like there used to be a wire in there) and there are 2 wires in port 1 (3rd one along) so I need to know which one from port 1 needs to come out and go in 3,

I could still have the wrong thermostat as the reciever maybe on the old frequency, however I want to get the wiring sorted first.

 

[jtsplumbing]

Hi looking at what you have sent i think what you have is ; mains supply in / is center cable N.L E , right hand cable is supply to boiler N.L. yellow has been used as E. Left hand cable is switch`d supply to boiler Brown wire into No 1 (3td from left) Blue wire into No 3 (5th from left) These two wires together will give permanent supply to boiler