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There are 3 3-way valves. The house was previously owned by a builder who over engineered everything. There are about 20 pipes coming out of the boiler room! I found the valve that seems to control the radiators. put into manual and hot water immediately flowed around the house, so it seems...

so there are three Siemens zoning valves on different pipes. Im assuming on for hot water, one for rads and one for under floor heating.

I have put in decent batteries. I dont think that is the issue, as the CM67 looks to be working properly - telling the system when to switch on at the correct time etc - it just doesnt seem to be boiler. Ill see if I can locate the zone valve

Hi Dan, It doesnt say NG on it. It is wired in at the wall with a live and neutral wire - Im assuming they are just for power rather than to connect to the boiler?

Hi all, I would appreciate your help with what Im hoping is something very simple. I recently moved house. The heating system is pretty epic compared to what Ive had in the past. There is a Worcester boiler, and 2 heating zones. A CM61 controls the underfloor heating which is still working...