Hi guys, want to pick yours brains, I've had a guy call me, saying after they turn off the heating, it's a worcester combi, about 10 years old. After about 6 hours the pressure drops in the system and the boiler screams, also when the heating is on and they run the shower the needle on the pressure gauge goes mental, and the shower sometime goes cold. Any help be greatly appreciated guys.
all the best.
all the best.
