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Thanks for that desktop. Yes a circulation issue does seem to be the consensus and will investigate with my plumber. The only thing is, I thought the boiler temperature would need to be much higher say 80 or so for it to short cycle. Can I be sure the boiler is working ok?

No afraid not. Pump was changed to try to fix the problem. It was quite old and becoming very noisy anyway.

No I don’t think so ericmark. I have a Salus IT500 smart thermostat and the room never gets anywhere near the set point as I set it high to ensure the boiler keeps firing if it can, I.e to investigate what is happening. Temperature does not generally get above 19.

Thanks Madrab. Downstairs (7 rads) is 22mm. Upstairs (5 rads) is 15mm as this was done as a chalet bungalow extension. Flow pipe temp is around 64 max. From boiler in kitchen the pipe goes to the 3 way valve in the airing cupboard which is downstairs about 7m away. Hot water cylinder is about...

Further to my last post I monitored the boiler during Monday to see if there is any pattern in what it is doing. Boiler control set at 75%. The heating is set to come on from 6am to 11pm. Demand is continuous as the room thermostat never reaches temperature. The water comes on from 6 to 8am, 1...

Thanks again guys. I believe the radiators are average size although there are 2 doubles. I don't think the pump replacement made any difference apart from being much quieter. However I did not notice what the boiler was doing before we changed it. If the boiler cannot move the heat, could...

Thanks guys. I have tried putting the heating control to max. This helps in that the radiators now range from 46 to 56 (with a bit more balancing) but not as hot as they should be I think. The pump is a brand new Grundfos UPS4 Go. The motorised valve seems to be working correctly. I would...

Hi there. I have a Greenstar 24RI boiler and a gravity system with a hot water tank on the ground floor. I have an extended chalet bungalow, 7 radiators downstairs and 5 upstairs all with TRVs. Boiler is 7 years old and just had a new pump as old one was very noisy. Struggling to get house up...