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PostPosted: Mon Nov 06, 2017 11:56 am 
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Hi
I hope you can advise.
I have a Grant Vortex 21e Oil Fired combi boiler approx 4yrs old.

I have a pressure loss, the pressure in the boiler keeps dropping off too zero, very regularly.
I re-pressure the boiler to over 1 bar, sometimes up too 2 bar.
Turn off water inlet valves, boiler works fine for a while, but pressure soon starts too drop.

A ha I hear you say " you must have a leak", yep but doesn't seem to be a interior pipe or radiator as all seems dry, where it can be viewed, no wet patches etc.

BUT!, there is a pipe that comes out the back of the boiler, exits thru' the exterior wall, and this is dripping water sometimes slowly, sometimes a little quicker!

Does anyone know what this is? is it supposed to do this?

I live in a hard water area, but have had filter fitted to help, not replaced recently :oops:

Any help advice would be much appreciated.

I know i need a "proper" plumber, but would like too know the problem to explain, and what is needed for a repair, roughly!!

Thanks, hope for some excellent replies! :cheers:


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PostPosted: Mon Nov 06, 2017 12:13 pm 
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Not an expert but this sounds like a pressure release valve letting by. The PRV prevents the pressure in the boiler getting above the dangerous level. If they are triggered at some point then crud can get into the valve seat and it will drip by dropping pressure. It might need replacing. The other issue is the expansion vessel needs pressurising maybe.

DWD

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PostPosted: Mon Nov 06, 2017 1:12 pm 
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:withstupid:


Remove dust cap from expansion vessel schrader valve and press. If water comes out the vessel has had it.

If just air or flat, isolate boiler, drain boiler, leave drain open whilst repressurising expansion vessel with air to approximately 1 bar.

Close drain, open isolation valves and fill system.

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