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We had our boiler serviced about 6 months ago and the engineer set what I presume is the stat on the front of the boiler to 2 out of 5. He said it should never really need to go any higher than that. Last night we realised the heating was not working. After further inspection we worked out...

Have changed the wires and all seems to have worked, we now have seperate central heating and hot water control. Many thanks D_Hailsham for your advice it is much appreciated.

I know it has been a long time since the last post but for many reasons, mainly laziness, I have only just got round to trying to change the wiring. Back in May I was pretty sure that I knew what I was doing as it was simply a case of a missing wire to the HW OFF terminal, but now when I went to...

Back in May you gave some very good advice regarding my central heating, I'm afraid I need some more advice on the same problem and have added to the post called 'seperate hot water to heating control' in plumbing and heating. If possible could you have quick look, any advice would be much...

Yep all go into a junction box. It sounds easy enough, I will give it a go at the weekend and let you know the outcome.

What wire do I use to connect the timer to the SAT terminal. Also what are the chances of me blowing me or the central heating up if I do something wrong.

No not sure the blue are live, just thought they were for some reason, should know that really. Boiler is a Potterton Profile 50el Timer is Siemens RWB29

I checked the wiring to the diagram and the wire for timer HW OFF is not anywhere to be seen. I think there is 3 wires from the cylinder, the wires from the cylinder are connected as follows Yellow - Cylinder Grey - Valve (No timer wire connected with these) Red - Cylinder Black -...

Why do they always have to put the information you need in the most inacessable places, like an inch from the cylinder at the back of the cupboard. Anyway, the valve is a Honeywell V4073A 1039

I'll have look when I get home and let you know the part no. cheers

Looking at the wiring diagram I think my system does need to be rewired, as on the baseplate it currently has connections to only HW ON and CH ON and nothing to HW OFF. Me and electrics don't really mix so I may need to get someone in to get it done. Does anyone have any idea how much it may...

Many thanks for your reply D_Hailsham. I have moved the lever to the manual end and I felt the resistance from the spring ,when released it moved back smoothly. If it is an elecetrical problem do you have an idea what it might be?

Below is a picture of the valve.

photo

I believe the system is fully pumped. When we had an engineer in to service the boiler he had a qucik look and said we should only need to change the programmer. He mentioned that he thought he could hear a valve trying to open for the central heating when he tried something (not sure what)...

Our old Landis & Gyr RWB2 programmer would not let us have the heating on without the hot water being on. I thought this was because of the programmer itself so I bought a digital Seimens RWB29 that goes on the same backplate to replace it in the hope it would give me seperate control of both...