Grant Vortex Eco Condensing Bolier (Frost Protection cycle) (Ed.)

[debbie1968]

Hi everyone.
I had a new boiler installed in July this year in my lean to. It doesn't have a green box over it. All fine untill the cold weather came. The thermostat in the house is turned down to 15 at night but the heating comes on even tho the inside temp is 22. Our boiler man told us to turn our radiators down which we did which has helped. But he said the boiler will come on to stop the boiler from freezing which I understand.
My question is, has he plumbed it wrong? Surely it would be better to heat the water rather than cook us at night.
Looking forward to your replies

 

[foxhole]

Maybe try plumbing forum .

 

[Exedon]

As above have thread moved to Plumbing forum.
So you have a white cased Grant installed in a outbuilding?
It should have a frost thermostat fitted near it but also a pipe thermostat wired to shut boiler down when return pipe gets to say 20C .
We always do this type of installation including a auto bypass so if motorised valves are closed there is always somewhere for circulation.