I have to put hw and heating on for boiler to fire , then if I switch one off the boiler switches off , if I switch it back on boiler fires up again , if I then switch the other off boiler stays on , this can be either way depending on the last function before swithing it off completely is it the actuator or something else ?? any help will be much appreciated !
I have inherited the system , the boiler is a Saunier Duval Xeon , I was told the programmer has previously been replaced , I tried to put the heating on and the boiler would not fire up until I put on the hot water , the switch on the side of the actuator is at W , if I then switch off the hot water the switch moves from W to H and the boiler is still working . When I then switch off the heating the switch stays at H , but when I switch the boiler on for hot water the boiler doesn't fire up until I switch on the heating , then if I switch off the heating the switch moves over to W and the boiler is still working . I donot seem to be able to have hot water and heating on at the same time ,I thought I would be able to , my thinking is the switch on the side of the actuator would move to the M in the middle if I would be able to get hot water and heating at the same time ??