Grant Vortex 21e Hot water but No CH

[markadams]

Got a Grant boiler which recently ran out of oil, manage to bleed oil line, it now fires fine when hot tap is opened but will not fire when in CH mode.

The Demand an CH Pump light are on but not the burner or flow.

It has two Pumps and no Diverter valve, I can't understand why it refuses to light as it works perfect in How Water mode.

 

[MarkOil]

They do, and they are pretty good.

 

[markadams]

Could be the board, seems a bit odd.
If the demand light is now going out, do you have power from the programmer to the boiler?
I'd be looking at your programmer

Surely if the heating is set to on/constant and not timed then it will ignore the programmer?

 

[MarkOil]

If its wired up correctly, I never read that part lol.
Could be pcb but id check with Grant tech guys