Hi, I have an old Biasi Prisma, the water pressure on the boiler has dropped to .5 bar after replacing one of the rads. I can't get the pressure back up to 1 bar after turning the feed screw on to cold main. I have used a foot pump to get pressure back in the expansion chamber, which was reading 3 after a few pumps. The needle doesn't move at all. Any ideas why this presure won't increase?
Help with Pressure on Biasi Prisma 24SE Combi
- Thread starter Hobie
- Start date
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It sounds as if you have something simple gone wrong.
With a radiator bleed screw OPEN, pump up the expansion to 0.9 Bar.
Then LEAVING the foot pump CONNECTED watch its pressure gauge as you try to fill the boiler to 1.5 Bar after putting the bleed screw back in.
The foot pump gauge should go up to 1.5 Bar when you do this.
You may have a blocked communication pipe but thats very unusual on this model.
Tony
With a radiator bleed screw OPEN, pump up the expansion to 0.9 Bar.
Then LEAVING the foot pump CONNECTED watch its pressure gauge as you try to fill the boiler to 1.5 Bar after putting the bleed screw back in.
The foot pump gauge should go up to 1.5 Bar when you do this.
You may have a blocked communication pipe but thats very unusual on this model.
Tony
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