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Thanks guys

Yes, some cooler spots so perhaps air in the system, but nothing that will come out of the bleed valve. Had a new bathroom put in 4 months ago and the system was drained down then. Perhaps a drain down, flush and refill will help?

Boiler temp is set to a tad under max

That's the problem Mickyg, rads don't get hot when the room stat is turned up, and the boiler doesn't immediately fire when the room stat is turned up too. That's why I put a new room stat in. Boiler seems to have a mind of its own when to fire up. Guess it could be responding to call for hot...

Rads warm up OK when the boiler is firing....

Any help with this one, much appreciated. Can't get to the bottom of it. In this cold weather, my house rarely seems gets up to room stat temperature, I have a thermometer right next to the stat so can see the difference, or it just feels cold in the house. I noticed the boiler (Potterton...