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The boiler engineer has put a pressure gauge outside on the outlet pipe which I'm told should have registered if a faulty PRV had released pressure. I have lost 1 bar pressure over 3-4 hours but there's zero reading on the gauge. So, I have a new expansion vessel, no apparant problem with...

the boiler engineer just phoned. he's suggesting now putting a second RPV on the outlet pipe - and if the first rpv is no good, it will show as a loss of pressure. still seems to think the loss of pressure in the system is too great fpr the rpv - still beleives its a leak. However, leak...

thank you. I will get the boiler engineer in on Monday. Why would this not be a problem when we are just heating the upstairs radiators?

Have Warmflow 70/90 combi oil-fired boiler and first experienced pressure loss to 0 before Christmas. Boiler engineers replaced expansion vessel but no change. Advised boiler working so must be leak in pipes losing "a bowlfull" of water every time pressure drops. Engineers put valves on pipes...