Hello. Wonder if someone can point me in the right direction?
I have a Sundial Y-plan sealed system at home, with a three-port valve. Been here 30 years and it's regularly serviced and maintained. Never really had issues. The boiler is a Potterton Profile 60e also serviced yearly.
A couple of weeks ago, water was flowing outside onto the floor from the cold water tank overflow pipe. Easy, I thought, must be the tank valve needing replacing, which I did.
Still leaked, not just a drip but a stream. Flushing the middle or top loo's cured it for a while.
I went up again and bent the lever arm to make sure pressure on the valve was enough to stop the flow.
Still leaked. I then noticed the valve was completely shut off when full so was working ok. Strangely, the tank water was warm. I'm now assuming there's back pressure from one of the two 22mm pipes that come out the bottom of the tank and thats filling it with warm water. There's also a 22mm u-bent pipe that discharges into the tank, but this is dry and not the issue. I taped a plastic bag on the end and it's dry.
During the day when the hot water/heating is off everything is fine but in the evening/early morning when both are on, it occurs.
Anyone have experience of this? I'm guessing it's a heating engineer's job which I'm happy to employ but would like to know what may be the cause.
Many thanks.
I have a Sundial Y-plan sealed system at home, with a three-port valve. Been here 30 years and it's regularly serviced and maintained. Never really had issues. The boiler is a Potterton Profile 60e also serviced yearly.
A couple of weeks ago, water was flowing outside onto the floor from the cold water tank overflow pipe. Easy, I thought, must be the tank valve needing replacing, which I did.
Still leaked, not just a drip but a stream. Flushing the middle or top loo's cured it for a while.
I went up again and bent the lever arm to make sure pressure on the valve was enough to stop the flow.
Still leaked. I then noticed the valve was completely shut off when full so was working ok. Strangely, the tank water was warm. I'm now assuming there's back pressure from one of the two 22mm pipes that come out the bottom of the tank and thats filling it with warm water. There's also a 22mm u-bent pipe that discharges into the tank, but this is dry and not the issue. I taped a plastic bag on the end and it's dry.
During the day when the hot water/heating is off everything is fine but in the evening/early morning when both are on, it occurs.
Anyone have experience of this? I'm guessing it's a heating engineer's job which I'm happy to employ but would like to know what may be the cause.
Many thanks.