I can say i have checked what the pressure is when the boiler is producing hot water and central heating, i will have a look. As for the PRV seems to have collected some water from it, about 1inch in the bottom of a coke can.
How can i check the pressure/expansion vessel or if the diaphragm is split?
Wife says heating has been on for 1hr, pressure is just over 2bar. When the bolier fires up the pressure goes up until is turns off and the reading is now 2.6, (in to the red zone) maybe why i am getting water from the PRV, but why is the pressure rising so much and into the red. Normal cold pressure is 1.5bar
I released the pressure from the boiler by twisiting the PRV until the gauge said zero, i then repressurised the expansion chamber with a foot pump as your suggested to 1bar and repressuresed the system. Boiler is working fine, pressure seems constant and with no loss. I will continue to monitor and hope the issue is resolved, if not I will be back on.
HTG engineer many thanks for your help, it has been invaluable.
Thanks for letting us know the advice worked. We get many posts, where we give advice then never hear anything else - we can only assume our advice worked and that's why they've never been back.
Sorry missed the bit about the cost of replacing the vessel. If you go for the manuafcturers pressure vessel, sometimes you have to take the boiler off the wall, and can be expensive. But you can buy an expasnion vessel and fit it externally (tee'd into return, near boiler) which is alot cheaper and simple a DIY task (£30 - £40ish)
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