I would like to add my thanks to the person who suggested cleaning the battery contacts. This did the trick for me after a heating expert fiddled around a bit when the Digistat first started to play up, but didn't achieve a permanent fix. What I find curious is that the transmitter and receiver both showed the correct signals, even though the heating didn't come on.

Maybe the weak signal was strong enough to show the correct signals but not strong enough to trigger the proper action. Freezing Phil January It works!! Just like everyone said! And thanks a million. I too had a green light on the SRC but no heating. So I went and bought a capacitor from Maplins as per the link someone posted, undid the SRC and soldered in the new capacitor and what I know about electronics wouldn't crowd a postage stamp.

Not enough physical space inside the SRC for the capacitor which is definitely bigger than the original one but I squeezed it in somehow and didn't break too much white plastic. Just plugged it all back in and it's working fine.

TonyG January I'm having the same issue of the thermostat and 'SCR' pairing, the signal for CH being received green light comes on but the boiler does not fire. The manual over-ride does not work either. So it's definitely a capacitor issue. I mentioned that perhaps this is a recurrent issue which several customers are experiencing, to which the response was "we sell millions, some must be faulty"!!

Horrible experience, more so because customer service had asked me to remain at home in front of the SCR so that tech could help me with a few steps. So took leave from work, only to be met with utter rudeness! Sq Soc January Thank you bully beef. I contacted Drayton today and as has already been said their technical department are very good. After running some diagnostics, they seen to think it is the SCR.

They are sending a new one out FOC. I had worked myself up for a big argument, but they could not have been more helpful. If the new SCR does not fix the problem then I will treat myself to a mark 3 plus.

Peter, Woking in Surrey January It has stopped working or at least communicating with the heating valve and boiler. I have replace the batteries several time, stroked it and when this did not work I hit it. This actually worked a couple of times, but now the only way to get the heating on is to have the hot water on at the same time.

I can then manually push the valve switch over. If all of the wiring is all the same, can I just swap them over? Thank you.

Peter, Woking in Surrey December Actually SCR stands for Silicon Controlled Rectifier if you are refering to electronics, either being a thyristor or triac! Electronics expert December Just replaced the 0. The fix has worked thanks to the expert who first discovered the cure , but it would be an idea to try and find a replacement with the same capacitor dimersions to save cutting the plastic housing. I found fitting the Maplin's item was best by cutting the old capacitor leads off right next to the capacitor body, this allowed the new unit to solder directly onto the old lead stubs without the need to remove them from the pcb.

Will be interesting to see how long the new capacitor lasts before I need to repeat the fix. GregH December I changed the batteries and pulled the prongs forward as suggested and, finally guessing it was the connection put small piece of alumnium foil between batteries and their connectors and bingo thermostat and boiler back in action.

Has anyone thought of trying a transformer in place of the capacitor to provide the 24volts? It would obviously have to be mounted outside the receiver, the capacitor disconnected and wiring arranged to connect to the pcb. I have several power units from old phones etc and I'm sure one of them would supply 24vac. Bit more reliable than a capacitor - known in the electronic world as a wattless resistor.

Derek December Thanks Charlie Dave December Donna - Your SCR will physically be wired to your boiler, so hopefully shouldn't be too far away from it, trace the wires back. Dave - the SCR has four plastic locating tabs, two on each side to hold the case together, you need to carefully prize them apart with a small flat headed screw driver or something similar, I found on mine that the same tabs then also caught on the circuit board so some more gentle prizing was necessary to remove it but AFAIK the case front is not held on in any other way - once you have it off you'll see that th board is held to the other half of the case with two additional tabs, which will be obvious when you'vew opened it up.

How do you open the Digistat SCR casing to access the pcb? I can open it on one side but something seems to be preventing it coming right out.

Dave December Well, this thread has been very helpful - so huge appreciation to those who have contributed so far. I have replaced the batteries on the transmitter unit - found the pdf with instructions for re-pairing the transmitter and receiver, noticed the corrosion on the battery contacts need a nail file to sort that - BUT - can't find the receiving unit SCR anywhere! Really a problem. So, my question is, can I ignore the lost receiver and do I need a plumber to somehow put a whole new unit in.

It's not funny - really can't find the receiving unit anywhere in the house. The plumber who installed it all also seems to have disappeared off the planet which does not help Donna December Steve P Nov slightly misleading response.

Skipdy December Hi All - I too went to Maplin and replaced the Capacitor, and all has been fine for the last 3 weeks however the SCR appears to have developed a new fault - the red light on the receiver will stay on as a solid light for minutes at a time.

It will then flash, then the boiler will fire up, and then a minute later the boiler will go off and the solid red light is back on again. I've replaced the batteries in the transmitter, but that didn't work, any thoughts, other than chuck the whole thing in the bin and get a system that actually works?

Pappa J many thanks,but which one is the direct replacement? Agree with Kayball comment May However, if you do not have electrical capabilities, buy the part and have someone replace it for you. It's a cheap fix. Pappa J November The capacitor from Maplins is not the same as the one on the SCR receiver.

A little modification is required to the housing but it will fit and work. My scr still wont switch on my boiler any advice would be appreciated. Could it be the small capacitor on the pcb? The suggestion to clean the battery connectors in the draws worked a treat.

Can't believe this was all the problem was. Whoever discovered this, thankyou, thankyou thankyou. Russ November Had similar problem with the RF1 not sending signal. Looked at terminals in right hand box and one was corroded, cleaned it and pulled prongs out slightly. Put back together and did the re-learning process and Bingo, it works.

Many thanks Gary for the tip, saved me the hassel of calling engineer and a wad of money. Stuart Philip November Ay suggestions? Laurence November I have had problems - housemove and finding heating wireless thermostats I do not understand, flashing light nightmare! I have found complete instructions for all models of Drayton thermostats at this address: www. Stephanie Lowe November Best to put it in the bin where it belongs and replace it with a decent unit Jeff H November Hi - Thanks Joy and Gary!

And now it works! I also spoke with a technical expert at the manufacturers, Invensys, who said that it was my boiler that was the problem, not the receiver unit.

To quote, " I havent seen the cap problem since Paul B November I have had issueswith the Drayton RF1 digistat recently. The unit seemed to communicate fine, but would not kick the boiler or valve into action. It's not nice having to do that at 1am, when the house is cold!!!

Just replaced my Capacitor after seeing the same issue of the unit not switching on intermittently. Found the 0. Hope this helps someone in the future. Steve P November To qualify my answer just now, I've repaired the 0. By the way, in my opinion Drayton are being somewhat misleading when they refer to this as an "SCR".

It is not an SCR at all, just a bog standard relay circuit. I suspect they are just trying to make it sound more complicated so as to discourage people from repairing it.

Anyway, you can buy replacements, or refurbished ones, on ebay. You might even be able to get a part ex there I have successfully repaired two of these Drayton RF units, I have parts to repair another four; I can either repair yours or I could do you a part-ex for a repaired one if you prefer.

Henry Robinson October Having partially dismantled it and pushed it back on the wall so that it is live, there is no output back to my wiring box from the 'switched' terminal. The room thermostat transmitter works OK. Mark October Any luck in tracking down a replacement? Charlie October I am looking to replace the capacitor in my failed receiver, but am having trouble finding a suitable replacement.

The one there is KNB X2 0. Can anyone please suggest a suitable replacement nd stockest. Thanks Paul PaulBaker4 October Replaced batteries - pulled out tongs a fraction put all back together but still no screen power. Can get heat by pressing the overide button - any ideas as to the remote unit??? Mike M October Just like to say that Gary, you are a star - I too had wireless failure and carried out what you had suggested - pulling out the prongs slightly in the unit - it was only when I was putting the batteries back in that I noticed there was very slight corrosion on the contact plates at the front of the drawers.

Used a small nailfile to clean these up being a girly and ta-da! Job done! Thanks Gary Joy September Hi my Main combi boiler just wont fire up for the central heating. No errors on the boiler. I am using a digistat rf1 wireless receiver which seems to be working fine. However the manual overide dosent fire up the boiler for central heating but there is no problem with the hot water at all. Any help would be appreciated as its coooooooooold Jim September Slugbabydotcom , 24 Nov These may be more use User instructions.

AndyOlds , 20 Jul Space, Indeed! I however, came across this website as I was searching for the instructions myself. I'm sure other people will do the same. Just thought it might be useful to add the link in case anyone else does just that. AndyOlds , 30 Jul Joined: 3 Sep Country:. Select the supplier or trade you require, enter your location to begin your search. What does "Optimised Settings" mean? When used with a Heat Pump the Digistat will protect the compressor by reducing cycling to 3 cycles per hour, to improve the life of the compressor.

When used with an oil boiler the Digistat will allow the boiler to run without cycling for improved efficiency. When used with electric heating the Digistat cycles the heater at 12 cycles per hour to maintain room temperature and save money. How do RF versions pair with the receiver? As soon as both the Receiver and Thermostat are powered up they will automatically pair.

If you find that the 2-minute auto-pairing period has expired, please follow the following process: Reset the Digistat thermostat by going into the setting menu, selecting the Inst03 menu installer settings and then rSEt20 to reset to factory settings. Then remove the batteries. Put the batteries back in the thermostat and they will now pair automatically. How do I change from heating to hot water on the Digistat RF? In either mode the radiator or tap icon will be displayed. How do I change from Automatic to Manual mode?

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This groups weekdays and the weekend separately, so you can set a schedule for your weekdays and a separate schedule for the weekend. This option has no schedule and controls by temperature only. This denotes that the batteries in the Digistat RF unit are approaching the end of.

This denotes that the SCR has been unable to receive a radio signal from the. Digistat RF unit. This may be caused by the batteries being dead see 'battery. To re-send and test the signal, go to the Digistat RF unit. If the flame symbol is. If the flame symbol. If the radio signal has been. If the red LED is still on, 'learn mode' may have been selected by accident.

SCR buttons 1 and 2 pressed simultaneously.