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Thanks Yes. On the pull down panel that exposes thermostat it says space saver 80 mk2, but on the instructions on the panel for lighting the pilot light it just says space saver mk2

Thanks doit all. Space saver 80 mk 2

Thanks+sorry I was editing my last post while you replied. HW ZV is IFLO ZA5. I can just make out cut back orange and grey wires enoughto do continuity test when valve is actuated and microswitch works. Ch ZV fails on continuity when actuated. The red wire...

Ok I have traced the wiring. Term 3 on programmer has 3 wire. One turns pump on, one to the boiler and the other to the HW zone valve via the cylinder stat. So the pump and boiler are on even if stat is satisfied. Term 4 on the programmer has 1 wire. This wire activates the CH zone...

Thanks The pipe from the pump does split into the two zone valves one going into the cylinder and the other presumably going to the CH. I wonder about the wiring are you thinking the three wires are: one to the boiler, one to the pump and the other for the zone valve? Presumably the wire...

Thanks for the info. Remembered a plumber who did some work for us in the past. This was the person who told me I could not have CH without HW being on. Spoke to him yesterday and he said the reason is my boiler has to be satisfied that HW is on before CH can come on. Does this sound right...

Thanks. If the HW and CH are both on and the cylinder stat is satisfied the HW turns off, I can see this happen on the zone valve. However the CH stays on ie pump still turns, CH valve does not move, rads hot. Does this mean the microswitch in the CH valve is ok or do I still need to check it?

Thanks. fairly sure the pump comes on straight away. I will have to double check tonight. I am in work at the moment. Why?

Thanks. Will think about siting of room stat a bit more. My understanding of my controller is that it has 2 channels allowing independent control, but Iam probably wrong. Just realised connection 1+2 which have no wires going to them are for CH and HW satisfied. Connection 3 for HW on has...

Thanks mate. Have just checked the back of the timer and it is set to P already. After reading other posts I am starting to wonder why I have not got independent heating and hot water considering I have got a valve for each. Is this a wiring fault or is it just the way my system is...

This is my heating system as best as I can describe it: It uses a glow worm space saver mark 2 boiler providing heating to 10 radiators ( all trv ) and hot water to a cylinder. The system is fully pumped and uses 2 two port motorised valves. I believe the temp of the radiators is currently...