I notice that this has been listed before but it does not appear to have a clear explanation I also have also had a phantom boiler running when the programmer is off(Tempus 7 approx 15 years old). It usually is in the middle of the night. Timed to go off at 22.00hrs and if the tank is drained just after can cause boiler to run at 01.00hrs. Only way to stop was switch off power and switch on when get up.
Was suggested that 3 way valve was cause as it somehow still had a live feed to it? Have replaced motorised valve but problem is now happening at random times during day. Do I now replace the controller?
Was suggested that 3 way valve was cause as it somehow still had a live feed to it? Have replaced motorised valve but problem is now happening at random times during day. Do I now replace the controller?