Hi there,
My radiators on my central heating system have started to remain on all the time regardless of what the thermostat is set to.
The system we have requires that the hot water is on for the central heating to work.
I have checked the output from the thermostat with my multimeter and everything functions correctly here i.e. sends live to the valve when room is below set temp.
So venturing up into the airing cupboard and tracing out what is going on. It seems that the 2 way valve which is supposed to isolate the central hating flow pipe is not closing off the pipe although the motor seems to be working since the contact arm which triggers the microswitch to run the pump and boiler is working according to visual inspection and my trusty multimeter. It's not until the cylinder stat finally reaches temp, which it is finding hard since the radiators are demanding constantly that the pump and boiler cut out. The 2 way zone valve is normally closed so with the evidence above is unlikely to be the motor. The only way I can shut off the cental heating is to turn the manual red tap below the zone valve.
Any suggestions on what is at fault here and what needs replacing and how difficult is it?
Also is it possible to upgrade my system by adding another zone valve and upgrading the timer switch so that I don't have to always heat hot water when i want central heating as this seems very wasteful?
Thanks in advance
Lee
My radiators on my central heating system have started to remain on all the time regardless of what the thermostat is set to.
The system we have requires that the hot water is on for the central heating to work.
I have checked the output from the thermostat with my multimeter and everything functions correctly here i.e. sends live to the valve when room is below set temp.
So venturing up into the airing cupboard and tracing out what is going on. It seems that the 2 way valve which is supposed to isolate the central hating flow pipe is not closing off the pipe although the motor seems to be working since the contact arm which triggers the microswitch to run the pump and boiler is working according to visual inspection and my trusty multimeter. It's not until the cylinder stat finally reaches temp, which it is finding hard since the radiators are demanding constantly that the pump and boiler cut out. The 2 way zone valve is normally closed so with the evidence above is unlikely to be the motor. The only way I can shut off the cental heating is to turn the manual red tap below the zone valve.
Any suggestions on what is at fault here and what needs replacing and how difficult is it?
Also is it possible to upgrade my system by adding another zone valve and upgrading the timer switch so that I don't have to always heat hot water when i want central heating as this seems very wasteful?
Thanks in advance
Lee