ChatterBank1 min ago
Strange Goings On with Boiler: Pressure Surging when Hot Water Goes On
I bled my radiators a few days ago as the top of the radiators weren't getting warm. I probably collected about 1-2 litres of water in the process.
That afternoon I noticed that the pressure on my boiler had dropped below the acceptable green range.
So I let some water into the system until the pressure gauge moved up to the desired 1 bar
I noticed a few hours later that the pressure had dropped a little, so I put in a bit more water to take the pressure gauge back up to bar 1.
Then I put the hot water on and the pressure gauge rose to way beyond 3.5 bar *PANIC* (no water was flowing out the pressure relief value was newly fitted about 6 months ago?)
So I drained about 5-6 litres out of the radiators to get the pressure gauge down to bar 1.
Next time I put the hot water on it rose to about bar 3. (hot water not on for as long previously as I was keeping an eye on it)
So I emptied another 3-4 litres out of the system by bleeding a radiator.
Yep you've guessed correctly, next time I put the hot water on it rose rapidly again.
I bled another 3.4 litres from the system.
Pressure not sat at 3 when cold.
I don't want to bleed the radiators dry, so what do I do next? Ay idea as to what has happened?
All was fine before I tinkered with the radiators :(
Any help and advice will be very much appreciated indeed :)
Note the pressure doesn't rise as much when I put the central heating (only when I fire up the hot water) on if that's any help. It's a Alpha SY24 Boiler.
That afternoon I noticed that the pressure on my boiler had dropped below the acceptable green range.
So I let some water into the system until the pressure gauge moved up to the desired 1 bar
I noticed a few hours later that the pressure had dropped a little, so I put in a bit more water to take the pressure gauge back up to bar 1.
Then I put the hot water on and the pressure gauge rose to way beyond 3.5 bar *PANIC* (no water was flowing out the pressure relief value was newly fitted about 6 months ago?)
So I drained about 5-6 litres out of the radiators to get the pressure gauge down to bar 1.
Next time I put the hot water on it rose to about bar 3. (hot water not on for as long previously as I was keeping an eye on it)
So I emptied another 3-4 litres out of the system by bleeding a radiator.
Yep you've guessed correctly, next time I put the hot water on it rose rapidly again.
I bled another 3.4 litres from the system.
Pressure not sat at 3 when cold.
I don't want to bleed the radiators dry, so what do I do next? Ay idea as to what has happened?
All was fine before I tinkered with the radiators :(
Any help and advice will be very much appreciated indeed :)
Note the pressure doesn't rise as much when I put the central heating (only when I fire up the hot water) on if that's any help. It's a Alpha SY24 Boiler.
Answers
Best Answer
No best answer has yet been selected by ninah. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.i really dont know what is happening here as the pressure guage is for the central heating system and shouldn't be affected by the hot water at all.
the only thing i can think of is that there is a leak within the secondary heat exchanger and water from the hot water circuit is leaking into the heating circuit
the only thing i can think of is that there is a leak within the secondary heat exchanger and water from the hot water circuit is leaking into the heating circuit
Hi ninah
I agree with gucciman - well sort of !! I dont think he noticed that you have a system boiler rather than a combi (you do have a hot water tank right?) well I think its more than likely the indirect coil (which is a heat exchanger) inside the tank thats leaking
.you are looking at a new hot water tank if it is
I agree with gucciman - well sort of !! I dont think he noticed that you have a system boiler rather than a combi (you do have a hot water tank right?) well I think its more than likely the indirect coil (which is a heat exchanger) inside the tank thats leaking
.you are looking at a new hot water tank if it is
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