The pressure in my 80e Glowworm keeps dropping to 0.2 - 0.3 bar after being pressurised. Engineers have been out but have detected no leaks or any obvious problems. The radiators have all been bled and pressure put back up to 1.5 - 2.0 bar. After a day or two it drops right down again. The system works fine but surely the pressure shouldn't drop so low for no reason. Any thoughts? Other factors I can check myself??
cheers
PC

Paul Caulfield, June 2005

sounds like the heat exchanger inside the boiler has gone and the pressure from your heating system is getting into your hot water system which is why there is no sign of any leaks. The only way to prove this for definate is to cut your central heating off from your boiler and loop the pipes together thus eliminating any underfloor leaks etc , pressure it up and see if it still looses pressure.

Steve, June 2005