Yes another one I'm afraid. I had what I thought was one problem but now appears to have been two all along.
I had a mv which wasn't working that well and a pump which was running all of the time. I have changed the actuator head and the mv now spins over and responds to the programmer correctly but the pump never stops, I had hoped this would be due to a faulty microswitch having read a lot of the threads on here.
The boiler is an Ideal Excel RS40 from the late 80's, the system has a honeywell V4073a mv, honeywell tank stat and a randall 922 programmer. It doesn't have a room stat which I intend to rectify but not until I resolve the current problem. Radiators all have thermostatic valves.
In order so far I have changed the valve head as above as well as the tank stat as I understood the pump could be fed from either. I have also had the chance to try a compatible danfoss programmer and have swapped out the boiler pcb neither of which has had any effect on the pump.
I am guesssing there must be some other stat on the boiler which is firing the pump but I have got as far as I can without asking for help.
If anyone could shed some light on this I would be very grateful
I had a mv which wasn't working that well and a pump which was running all of the time. I have changed the actuator head and the mv now spins over and responds to the programmer correctly but the pump never stops, I had hoped this would be due to a faulty microswitch having read a lot of the threads on here.
The boiler is an Ideal Excel RS40 from the late 80's, the system has a honeywell V4073a mv, honeywell tank stat and a randall 922 programmer. It doesn't have a room stat which I intend to rectify but not until I resolve the current problem. Radiators all have thermostatic valves.
In order so far I have changed the valve head as above as well as the tank stat as I understood the pump could be fed from either. I have also had the chance to try a compatible danfoss programmer and have swapped out the boiler pcb neither of which has had any effect on the pump.
I am guesssing there must be some other stat on the boiler which is firing the pump but I have got as far as I can without asking for help.
If anyone could shed some light on this I would be very grateful