i have been called out to fix a sime friendly format 80e combi boiler. the problem is the presure gauge is at about 4 bar and there is water comming from the presure relief valve pipe whilst cold. i have narrowed it to the dhw heat exchanger leaking into the primary circuit. the problem is that when i isolate the cold water to the boiler the pressure drops but keeps on dropping to 0 bar. i would have thought that it would stay at 3 bar when the presure relief valve closes. Is this correct of is there a fault with the presure relief valve aswell
yes water still comes out of the PRV when the water is turned off. It keeps on discharging until the gauge reads 0 bar. What I am wondering is if the PRV is stuck open as I think this has been happening for a while judging by the state of the wall where the water hit it
I might just put a new one on whilst the system is drained to be sure
Am I in the right ball park with me thinking it is the DHW heat exchanger. I have checked the filling loop and that is fine
thanks for the tip but i cant run the heating as the PRV lets water through till the gauge reads 0 bar thus stopping the boiler from firing.
i will change the heat ex and the prv and will let you know how i get on
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