Drayton Wireless Thermostat. Not working Heating. Please help?

Aarons answer worked for me. thankyou Aaron

kim
October 2012

hi, my stat packed up as I found the batteries got hot. So now I am in the process of having no roomstat and just relying on the TRVs and manual control.
I have bridged out the connections with a piece of short cable, it works but each morning the boiler needs to be reset. I am not sure what is going on but suspect the frost stat or the old wireless stat is interfering somehow. I will get there I think !

pugo
October 2011

The receiver unit (that connects to the boiler wiring) for all the later versions of this wireless thermostat are the same, the trarnsmitters, with the LCD display are different. Most receivers suffer from a common fault which is the large capacitor (0.68 micro Farad) on the circuit board developing an increased Equivalent Series Resistance (ESR). WARNING: UNLESS YOU HAVE ELECTRONIC KNOWLEDGE DO NOT ATTEMPT TO REPLACE IT. It is a special type (X2) designed for safe connection across the mains. Electricaly equivalent items from most component supply shops I tried are physicaly too thick to fit in the box and I found that only the exact type originaly fitted will suffice. These are difficult to obtain.
In my opinion, the circuit design is very poor, as this capacitor is used to reduce the AC mains voltage from 230V to approximately 24V. As the capacitor becomes defective with age, this voltage drop increases and when a signal is received from the thermostat, causing more current to be drawn from the mains, only 9V or less is available to operate the switching relay on the circuit board, which needs 15.6V to energise.
Hope this helps someone with electronic knowledge and discourages others to try and replace the capacitor.

Kayball
May 2010

(from http://www.howtomendit.com/answers.php?id=49588 )

David Bed
September 2011

Same problem here. Something odd about the connection in that you can go through the whole re-learning commission process and then after 24 hours it stops working again.

Temptation to smash it up very high.

Can anyone recommend a reliable long term replacement?

David Bed
September 2011

to re-sync stat firstly take roomstat to the reciever take out batts from roomstat push both buttons on reciever hold in whilst red light blinks this is called the learn mode when flashing stops release buttuns and insert batteries back into roomstat hopefully the green light will flash if so turn roomstat to max and min to see if programmed .

aaron
December 2010

Temporarily you can press the override button on the receiver to get some heat. Sounds like the thermostat needs reprogramming to the receiver.
You need to go to the Drayton website and download the relevant instructions to get it to send and receive signals

Steve
December 2010