I have an old style boiler, hotwater tank and rafdiators. My radiators stopped coming on. I can turn them on using the manual lever on the motorised valve - its a Landis and gyr MAV-322, which you can´t get any more, but apparently a siemens cmv 322 is a direct replacement. I found a diagram for possible wiring. There are 5 wires
green/yellow for earth
blue for neutral
white, which I think is the live feed from the room thermostat
grey, which I think is the live feed from the hot water tank thermostat
orange, which is the boiler and pump connections
Does anyone know if this is a feed from the bolier and the pump or to the boiler and the pump.
I checked the signal from the room thermostat with a meter and that is getting there ok. And like I say, my heating comes on if I use the manual lever, but sometimes, my boiler turns off the heat, so I was wondering if the orange wire sends a feed to the boiler to tell it to fire up and that that´s intermittent, or whether there is something else faulty?
green/yellow for earth
blue for neutral
white, which I think is the live feed from the room thermostat
grey, which I think is the live feed from the hot water tank thermostat
orange, which is the boiler and pump connections
Does anyone know if this is a feed from the bolier and the pump or to the boiler and the pump.
I checked the signal from the room thermostat with a meter and that is getting there ok. And like I say, my heating comes on if I use the manual lever, but sometimes, my boiler turns off the heat, so I was wondering if the orange wire sends a feed to the boiler to tell it to fire up and that that´s intermittent, or whether there is something else faulty?