central heating programmer

Hi all - bit of issue on Christmas Eve My Horstmann channel plus model H27 has stopped working. I have been able to source a Holywell ST9400A this morning. The Horstmann has following cables connected in Clip position 5 black cable Clip position 4 cable black cable Clip position 2 cable 2...

Hi all, I currently have installed a Danfoss FP715Si (TP9000) 2-channel CH/HW programmer, but the factory-set clock is entirely wrong and it is just getting old. So it is time to replace it with something more modern. Ideally, I would like to be able to replace it with something that can reuse...