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Thanks for that. So far as I can tell (and I can hear the pump) The pump runs all the time. I except that when the heating first come on the pipes expand etc and it is noisy. What is bugging me is the fact that the when heating cools down the whole warming up process starts every...

You are correct I think they all do the same job. Its just that the wiring was different and this was what caused the first vave not to work properly. Yes I will get the plumber back. the reason I posted was, are the symptoms I describe normal or should the radiators just cool down a bit...

In another post regarding my radiators always being hot, even though the thermostat turned them off. Its turned out that BG had fitted the wrong 3 way valve. Thats now been changed and when the thermostat clicks off the radiators go cool very quickly. The only problem is that that when...

Well folks, the man from BG came today and fitted a new 3 wire valve in place of the 5 wire. And its working perfectly. BG replaced the valve two years ago and it as never been right, they kept saying that it was sludge (despite the water being crystal clear) Anyhow it turns out they...

Are there any reasons why you cannot use ethylene glycol antifreeze in a central heating system. The only reason I can think of is because its poison or toxic in some way. It has all the inhibitors etc. Ron

The man from BG came again today. He still thought it was sludge, untill I explained that the valve stays in the mid position. ( he thought the motor was winding back but sludge was not letting the valve seat properly. Now its seems I have a 5 wire motor fitted to a 3 wire system.. And...

Yes the motor moves fine when you turn the thermostat switch on and off. When its removed from the valve. It just dosen't seem strong enough to turn the the valve. Yet the valve dosen't seem that stiff. I can easily turn it with my fingers and it feels smooth. How powerful are these...

HI , I can't see a make, it just says BVMVSP on the motor bit. its blue plastic and it just pushes on the the valve with a clip. It also has some sort of toggle switch underneath at the bottom. I doubt its contamination because they don't work from new. For the last couple of years iv'e...

Hi! Yes they replace the full thing. I don't know the make. all I know is its blue. It always comes on. but only seems to stick when it should turn off. Thanks Ron

Thanks for that, I understand what your saying, its just that the system was flushed a couple of years ago. Then the water was black and I flushed it out about three times( cost me a fortune in flushing chemicals) until the water was clean.. An inhibitor was put in and the water has been...

I have a problem with my central heating. When the heating comes on everything is fine until the thermostat clicks to turn the motorized valve. The problem is the valve dosen't move and the radiators stay hot. There is a lever at the side of the valve, the slightest touch on this starts the...