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Pressure fluctuations - help!
I have an Ecotec Plus condensing boiler put in 2 years ago in a 1970s 4-bed detached with rad system and hot water.
At the last service the engineer said that the boiler had somehow put itself into almost idle mode and he reset it. Now the heating is great and all is good.. not
We woke up a week later and the pressure was zero - F22 error. I filled up to a couple of bar and all came on again. One radiator was stone cold but after 3/4 hour suddenly decided to come on - suspected a blockage that cleared itself...
In fact I didn't put that much water in and the pressure seemed to be rather high so I bled a bit out.
Anyway, all was well for a while but day by day the pressure when cold fell to almost zero again after about 3 days.
Funny thing is hot pressure is very high - almost 3 bar maybe - and stays that way throughout.
No sign of any rad leaks. There is a small warm patch in the shower room floor closeish to the rad down pipe, but the concrete surface is bone dry - may be nothing..
If it was a leak, where does the water come from to restore pressure when hot? I realise Boyle Law etc does increase pressure, but surely not by almost the entire scale?
Could all this be explained by gunge in the system? I have to confess to not having flushed the system before installing the new boiler. We do have a Magnaclean installed though and when I did bleed some water out it was clean.
Does this sorry tale make any sense to anyone out there?