C
CNelson
I have an unvented system in my home. The fitters that installed it recently came back to replace the expansion vessel as it kept hissing. They said it was a fault with the seal on the expansion vessel. Unfortunately, the new expansion vessel is still hissing.
It sound like boiled water hitting a cold surface, with some gurgling sounds. But predominantly hissing.
When I put the heating thermostat up high for any length of time then switch it off, that's when the hissing happens.
The tundish is dry.
However, the pipe from the expansion vessel to the tundish feels hot.
Can anyone advise about this problem?
Thanks very much.
-CP
It sound like boiled water hitting a cold surface, with some gurgling sounds. But predominantly hissing.
When I put the heating thermostat up high for any length of time then switch it off, that's when the hissing happens.
The tundish is dry.
However, the pipe from the expansion vessel to the tundish feels hot.
Can anyone advise about this problem?
Thanks very much.
-CP