Hello all,
My continuing struggle with my heating system goes on. I recently replaced the heating pump and some valves, and the banging when the boiler started up has gone away. So that advice was very good.
However, there is still the problem that the radiatiors get hot whenever the hot water comes on, even when the central heating is set not to come on. The setting on thermostat downstairs seems to have no effect at all.
I guessed it was the 3-port motorised valve (Landis & Gyr MAV322). Removing the cover I noticed that the motor would not turn to the "B" setting, it sort of got halfway and just clicked. Looking further, I found that one of the two microswitches on the circuit board seems to be broken. Presumably this is the problem with the valve? And if that is the issue, replacing the microswitch (or the whole valve) should fix the fault, surely?
However, even when I jam the valve at the B setting, which should send all the water to the cylinder, the radiators still get hot.
So I'm stumped. If the valve is broken, then why doesn't forcing it to the B setting stop the hot water going around my central heating system?
Many thanks!
Neale