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Good evening, please could you tell me the make and model of your boiler?
Also, the current system pressure reading.
What does the pressure go down to?
Are you seeing water coking out of the discharge pipe outside the house? When you say red valve, I don’t see that in any photos.
If the pressure is dropping fast, it’s not feasible to operate the boiler at all. If the PRV isn’t shutting then it will have to be replaced.
OK I see the valve - that’s the heating flow pipe. It’s hard to imagine how someone could have been using this boiler. When was it last working reliably?
What is your plan with the leak? I suggest that you contact the owner and ask them to fix it, otherwise you can’t use the boiler.
Thank you for your rating; I'm glad that I could help. I hope that the owner was responsive.I hope you enjoyed your experience with JustAnswer.Have a wonderful day :-)