Please help, I have recently noticed that my CH system has gone mad constantly giving HW to the rads when the house is already hot.
Through a together with this it stopped heating the HW. I have discovered that the boiler is correctly responding to the thermostats but for some reason the priority valve between CH & HW does not respond. The pipe from the valve to the HW tank is hot from conduction I assume because the pipe from the tank back to the CH is cold. The pumps running and only the rads are getting heat even though the house is hot.
If I reduce the HW temp demand using the tank thermostats the pump stops and boiler clicks out, the priority valve werrs! If I then increase the HW demand using the tank thermostate again it all springs into life again. Then I seem to get movement of HW through the tank as the return pipe now gets hot almost immediately.
I think the rads are getting HW when it should be going to the tank to heat the HW, so over heating the house because the tanks not getting any!
Does this fault ring any bells with anyone. Can I change anything cheap without having to drain the system down ?
I have a danfoss valve that I have removed from the three way valve, I can move the spindle by hand so it's not ceased?
Any suggestions graitfully received?
Dave
Through a together with this it stopped heating the HW. I have discovered that the boiler is correctly responding to the thermostats but for some reason the priority valve between CH & HW does not respond. The pipe from the valve to the HW tank is hot from conduction I assume because the pipe from the tank back to the CH is cold. The pumps running and only the rads are getting heat even though the house is hot.
If I reduce the HW temp demand using the tank thermostats the pump stops and boiler clicks out, the priority valve werrs! If I then increase the HW demand using the tank thermostate again it all springs into life again. Then I seem to get movement of HW through the tank as the return pipe now gets hot almost immediately.
I think the rads are getting HW when it should be going to the tank to heat the HW, so over heating the house because the tanks not getting any!
Does this fault ring any bells with anyone. Can I change anything cheap without having to drain the system down ?
I have a danfoss valve that I have removed from the three way valve, I can move the spindle by hand so it's not ceased?
Any suggestions graitfully received?
Dave