I've searched the forum already and found that someone has had the same issue as me but there wasn't any conclusion so rather than me explain it all again this is the link to the previous guy's message:
The forum rules ask for the following info:
1) Boiler make / model (gas or oil)
Worcester/28i junior Gas Combi Boiler
2) What is / is not happening.
The wireless Digistat is not starting the heating (see further info below)
3) Has ANYTHING else been done or changed recently.
Just changed batteries in Digistat Transmitter
4) When did the problem start?
After changed batteries - wouldn't re-initiase rf connection
5) When does it happen? eg, heating coming on or going off.
Doesn't come on
6) Anything else you feel may be of relevance.
So, I changed the batteries of the Worcester Digistat Transmitter (to the letter of the instructions), then tried to re-initialise the rf connection by pressing the receiver buttons 1&2. Saw the correct quick flash of the red LED but then it goes solid red permanently an the Digistat Flame symbol coming on doesn't fire up the boiler
The forums I've read so far all seem to point to a faulty Receiver, I just don't understand why it would fail from simply losing it's signal when I changed the batteries in the Transmitter.
Are there any checks I can do on the PCB of the Receiver to see if it has indeed developed a fault (I'm from a technical background with electronics experience) no good without drawings or known voltages at key test points.
It still fires up the boiler when I press Overide.
Have got pics of Transmitter and Receiver in situ if that helps?
Any help gratefully received.
ps Sorry for long post.