I had a Vaillant Ecotec plus 428 (heat only condensing) fitted yesterday.
Boiler fires up and seems to work fine together with pump ,rads, hw etc
However whilst the progammer (a Potterton EP2002) lights up , it does not seem to be controling the boiler so I am on manual cotrol only . I can't tell if the room thermostat is working .
I've re-checked the wiring - we had 5 wires (from our previous Glow worm) 3 for L,N &E one for PL and one for terminal 4.
Boiler fires up and seems to work fine together with pump ,rads, hw etc
However whilst the progammer (a Potterton EP2002) lights up , it does not seem to be controling the boiler so I am on manual cotrol only . I can't tell if the room thermostat is working .
I've re-checked the wiring - we had 5 wires (from our previous Glow worm) 3 for L,N &E one for PL and one for terminal 4.