Hi,
I have a sealed system with a dualstream hot water tank and an accumulator, and a Worcester Bosch system condensing boiler. This was all installed just under 12 months ago.
The house is a three storey victorian house with 13 radiators. Boiler is downstairs in the kitchen, hot water tank and accumulator are in the loft.
Hot water is working fine.
When switching the heating back on last week I kept an eye on the pressure gauge. Basically what happens is that it's fine when the hot water is on, but once the heating goes on it goes up to 3bar+, the pressure release valve activates and some water is expelled from the system. When the heating goes off the pressure then drops to 0.
I refill the system when cold, it holds the pressure at 1 bar, then same thing happens when heating goes on.
If I don't refill the system when cold, it stays at 0, same thing happens when heating goes on (rises from 0 to 3bar+)
After reading various posts on here about similar problems I checked the expansion vessel to see if it had failed/dropped pressure, but checking with a tyre pressure gauge (while the system pressure read 0) the expansion vessel pressure was around 3 bar.
As there doesn't seem to be a problem with the expansion vessel can anyone suggest what else may be wrong?
Many thanks in advance!
I have a sealed system with a dualstream hot water tank and an accumulator, and a Worcester Bosch system condensing boiler. This was all installed just under 12 months ago.
The house is a three storey victorian house with 13 radiators. Boiler is downstairs in the kitchen, hot water tank and accumulator are in the loft.
Hot water is working fine.
When switching the heating back on last week I kept an eye on the pressure gauge. Basically what happens is that it's fine when the hot water is on, but once the heating goes on it goes up to 3bar+, the pressure release valve activates and some water is expelled from the system. When the heating goes off the pressure then drops to 0.
I refill the system when cold, it holds the pressure at 1 bar, then same thing happens when heating goes on.
If I don't refill the system when cold, it stays at 0, same thing happens when heating goes on (rises from 0 to 3bar+)
After reading various posts on here about similar problems I checked the expansion vessel to see if it had failed/dropped pressure, but checking with a tyre pressure gauge (while the system pressure read 0) the expansion vessel pressure was around 3 bar.
As there doesn't seem to be a problem with the expansion vessel can anyone suggest what else may be wrong?
Many thanks in advance!