Glowworm 30 ci losing pressure

[gaznic]

My Glowworm has been losing pressure over the last few weeks and been going below 0.5 and the red light flashing, I have been topping the pressure up with the blue knob but recently I have noticed that the overflow outside had been dripping...I was told it was the pressure valve so I have replaced this but the pressure is still dropping and leaking outside....any suggestions?????

Thanks

 

[Gasguru]

Expansion vessel may be low on pressure (see FAQs) but more likely the vessel hose is blocked. If it's an early boiler model you'll have hours of fun accessing the pipe clip.

 

[cbservices]

mate i've had this on a 35ci and it took stripping the dhw heat exchanger out descaling that (five hours later) re fitting refilling oh and you could try re seating the prv valve before buying a new one and dont pressure it upto 1 bar i did and prv started again so had too drain off at boiler drain cock too about.7 of a bar seems fine for now will keep you informed.