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Plumbing

New Central Heating system losing pressure. Checked for leaks - no sign. Any suggestions?

Anonymous user 23/02/2024 - 2.56 PM

Hi all I have had a completely new central heating system installed. It's a pressurised closed system. One leak was found with the initial installation and fixed. Subsequently pressure wouldn't maintain & kept dropping to 0.0 bar. System has had valves installed to identify whereabouts a 2nd leak might be. Since these valves have been installed, the pressure hasn't dropped. I've had various parts of the system on and off and still no pressure drop. Am now totally confused as to why the pressure was dropping and now isn't. Doesn't seem that there is a 2nd leak after all but I'm wary that there is a problem somewhere. I don't just want to assume that all is ok. Any suggestions would be very welcome..

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3 Answers

Anonymous user

It could be a number of things... 1. PRV not seating correctly so it was letting by (probably the most likely if the pressure is not dropping now) 2. A leak somewhere on the system it could just be a tiny drip. 3. A leak on the heat exchanger (not likely on a new boiler) it will go straight down the condense pipe and you will never know it’s leaking! 4. Incorrectly charged / faulty expansion vessel.

Answered15 June 2020

Combi Care

Rating: 4.9 out of 5

Stamford

Could be leaking from pressure relief valve there will be a pipe outside near flue pipe check to see if water dripping from it ?

Answered5 May 2015

D & R Property and Plumbing Maintenance

Rating: 4.9 out of 5

New Romney

some leaks ( small ones ) can take up and stop after a while due to sludge filling the leak,boss white hardening due to system heating up,prv not seating properly at first,if it is not loosing pressure now all you can do is keep an eye on it.

Answered7 February 2019