All is working, no warning lights, radiators all bled, BUT.
The water pressure dial is between 1 and 2 as it should be, but when CH
is switched on it goes right up to 3, bordering on the red line. If I
take a cupful out of the system it reverts to being o.k.
Then when I turn CH off it goes below 1 and I have to top the system
Driving me mad.
Any ideas please?