Pressure problem on central heating

[philipcooepr]

Got up the other morning and my pressure on my boiler had dropped from 1.5 bar to 0.9 bar. I cannot find any signs of a leak on bleeding valves or trv valves by boiler or on ceilings. I read it could be on the boiler so I put a bag on the outside pipe the PRV and shut the flow and return valves to establish where it was loosing pressure. I topped up to 1.5 and checked the next day, there was no water in the bag but the pressure was on 1.3 bar then when I oped the valves it went to 1.1 bar. I do not understand does this mean I have 2 leaks at once whick I cannot find ?

 

[Alpha man]

What type of boiler have you?

 

[diamondgas]

2 leaks .. maybe ... If you didn't use the boiler for 24hrs and it'd dropped then that indicates a very sm all loss in pressure... either temperature or water leak.... drop when you opened the vale to the system could indicate something more major 0.4bar overnight/24hrs is significant! However, what pressure do you have in your expansion vessel I wonder ?

 

[philipcooepr]

It is a vailliant ecotec pro 28, I took cap off expansion vessel and pressed it and there is air in it, I have also filled system and only filled one of the radiator half full tio act as a expansion vessel just incase to rule out.

Could it still be expansion vessel ?

 

[philipcooepr]

2 leaks .. maybe ... If you didn't use the boiler for 24hrs and it'd dropped then that indicates a very sm all loss in pressure... either temperature or water leak.... drop when you opened the vale to the system could indicate something more major 0.4bar overnight/24hrs is significant! However, what pressure do you have in your expansion vessel I wonder ?

What is a temperature leak ?

 

[PlumbBobBob]

no he meant that when temperature drops, pressure drops.

 

[diamondgas]

Philip honestly .... Best hope is that you have an expansion vessel that needes re-charged IMHO Get yourself a GSR bloke around ASAP!

 

[philipcooepr]

Will be getting a GSR round just like a bit of knowledge first. If the expansion vessel needs re-charging wouldnt that mean the boiler would rise to 3bar and discharge out the PRV ?