Air it aint

[Bridgewarden]

Hi all
I have a combination boiler in a bungalow loft. Works fine but when starting in morning I can hear what sounds like individual bubbles of air coming down the pipe to the first rad on the system (ground floor) and popping as it enters the rad. I have tried venting the rad but there is no air. The rad is hot right to the top. These sounds go on for about 3 minutes then no problem for rest of day.
Can cobi boilers produce steam? The pressure gauge is still at 1.25 bar as installed. Any thoughts?

Bridgewarden

 

[justlead1]

Hi. It sounds like the boiler is the highest part of the system. It may well be air at the upper most point of the boiler. Check the boiler instructions there may be an air release at that point? Good Luck

 

[REDSAW]

Hi. It sounds like the boiler is the highest part of the system. It may well be air at the upper most point of the boiler. Check the boiler instructions there may be an air release at that point? Good Luck

possible it could also be debris circulating, like solder.