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Thanks for this, I will probably check the rads again - can't really go anywhere at the moment can we. I balanced the rads by working from the quickest to heat up to the slowest. TRV open to max and lockshield off. Turn on heat and open lockshield 1/4 turn and then adjust as necessary. I...

Sorry about not getting back sooner, work gets in the way :) It is a Grundfos UPS 15-60 (130) set to position III. 1 bar with CH on and hot. So looking at the manual for the pump online, I can see that the pump has been set at maximum and I doubt that it was set to I to see if this would heat...

It says Heat on the front of the boiler, so I assume that is what it is. We have an expansion vessel in the airing cupboard which is showing just under 1 bar of pressure which is where the filing loop is. We don't have a loft so everything is on mains pressure.

Great, the first answer is kind of what I thought. Looking at the wiring at the programmer and in the airing cupboard I could not see a way to get the wireless stat to get the heating on, boiler yes but rads no. I will swap out the programmer now and then when that is working look at the stat...

It's an Ideal Logic Heat 24 - not a combi. It is a pressurised central heating system. Balancing was done from 1st rad to warm to last and set between 10 and 11 degrees difference between flow and return throughout.

Yes, it is the Pack 2 with the wireless-enabled programmer (ST9420C) & wireless room thermostat (DT92E)

I meant that they are Myson lockshields as well

Second question for today :) The RTS1 is in our hall and is behind a cupboard, plus the living room is on the 1st floor so we want the stat there. TRV in the living room will be set to max, so know about the lockshield aspect. I want to remove the RTS1 so this will remove the call for heat...

Hello, I have just balanced the rads and there is now a high pitched noise coming from the lockshields when the heating is on. The house was built seven years ago and no surprises the CH was never balanced when commissioned. The noise will vary on how open the TRVs are set as well. The TRVs...