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View the thread, titled "Gas Pipe blockage causing no pressure at boiler?" which is posted in Boiler Advice Forum on UK Plumbers Forums.

plumbgaspaul

Gas Engineer
I am looking to double check and ensure I am not missing anything obvious before updating landlord on what I think is a gas pipe blockage.
I attended a property that had a Worcester Greenstar 24i Junior. Tenant stated no hot water in bathroom taps, ok in sink for short period and flame reduced on gas hob when hot water running.
At gas inlet on boiler pressure reduced from 21mbar down to 0mbar once boiler fires up. Checked same at meter test point and was 22mbar with no drop. I spoke to Worcester and they stated that problem was probably regulator at meter. Found this strange as test point after regulator but called out SGN who replaced regulator. Issue remained the same. Gas pipes have been in place for over 10 year (possibly longer) fault only recently began. Gas pipes are under floor so difficult to access.
Is the issue a blockage in the pipe?
If so is there anyway to try and clear blockage?
Or is only solution to provide a new gas pipe run to hob and boiler?

Thanks for any advice -
 
If the hobs affected then gas line

Remove the meter hook an air compressor to the boiler connection and blow back to outside

Also do this on the hob feed eg from inside out but cap the boiler feed
 
I would check inside the Gas Valve filter first of all. It could well be the dust/shale resulting from Sulphidation. See this link.
The reduction on the hob could be related but it could also be a pipe size issue which has always been there. To have zero pressure at the inlet to the Boiler is likely a blockage in my opinion.
I have not seen it so I could be wrong!
 

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Thread starter

plumbgaspaul

Gas Engineer
Joined
Location
London
Member Type
Heating Engineer (Has GSR)

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Gas Pipe blockage causing no pressure at boiler?
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Boiler Advice Forum
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