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Try insulating the pipes with a length of foam pipe lagging...if there is enough room between pipes and trap.

Done.... Drained some water from system via d/stairs rad. until press. gauge read 0, removed dust cap from air valve on PV , secured footpump to valve, pumped up to 10psi, drained more water from radiator until pres. gauge read 0, pumped up PV to 10psi. charged system to 1.2bar via fill loop...

Model is a Ferroli Optima 701 (a face lift version of the 700) 9649L60547 I'll have another look for the valve. Heating is on at the moment and is over pressuring again. Don't think I'll be able to do much before the weekend. Edit:- Found the valve :D The PV is at the rear of the...

:( No joy........ What I thought to be the valve for repressurising the PV does not look like a Schreader type valve (like those on car tyres). The valve connector on the foot pump (just purchased from Argos this a.m.) did not fit over the short (25cm) brass tube that sticks out at the top...

Reassuring words ChrisR. I am about to carry out the repressuring, I will get back to let you know how it goes. Thanks for your help.

Cheers ChrisR. I have read several different pressures for the PV in combi boilers, ranging from 0.7 -1.0 bar. I understand the pressure required in the PV for the Ferroli Optima 701 is 10psi (0.7bar). Do I make up the remaining pressure in the system by using the fill loop? I'm really...

Having read other posts on this forum I am going to attempt to check and ,if necessary, repressurise the expansion vessel. Can this be done without draining the entire heating system (boiler and radiators) ? BTW Ferroli Optima 701 is 8yrs old.

I recently bled the towel radiator in upstairs bathroom. Since doing this I have had system pressure loss problems. There does not appear to be any leaks, apart from the pressure relief as the system over pressures. System fired up OK on first occurence after having bled radiator then...