Hey,
Vaillant 828E Turbomax plus, 7 yrs old, pressures ok (1.5bar at cold)
i've looked in past posts and can't seem to find the answer. My boiler runs ok when CH is called for at the room stat but when any taps are turned on the green flow light does not flash and neither does the boiler want to start up, this has just started suddendly and the DHW does not even heat up by chance, what could be the fault and is there any way of checking it??
Thanks in advance

Vaillant 828E Turbomax plus, 7 yrs old, pressures ok (1.5bar at cold)
i've looked in past posts and can't seem to find the answer. My boiler runs ok when CH is called for at the room stat but when any taps are turned on the green flow light does not flash and neither does the boiler want to start up, this has just started suddendly and the DHW does not even heat up by chance, what could be the fault and is there any way of checking it??
Thanks in advance