J
JohnDorset
Hi all,
I'm doing some changes to my central heating system which involve moving two rad tails and have discovered that I cannot drain the system.
All the rads are turned off to minimise the water loss but when I opened the drain valve nothing comes out (well just a trickle).
I checked for blockage at the drain valve and no problem.
I went to the old tail and turned the tap on, and the flow increased but only slightly, so I decided to go and check the header tank.
What I discovered is that the header tank is full indicating a blockage in the feed from the header tank. I also suspect a partial bloackage elsewhere as it won't drain when I turn the rad valve on at the old tails.
What I did discover when I went into the roof is that the header tank had a brown geletanous substance on the surface and it is obvious that if this is in the pipes, then I have a real problem.
The heating was refilled with Furnox inhibitor when the main hot water system was upgraded professionally to a non-vented system a couple of years back.
Any clues about what this substance is and how I get rid of it. Call in an expert to flush out the system is an acceptable solution, and that is what I am minded to do, but I would like to know what this substance is and how difficult it is going to be to flush the system out.
Kindest regards
John
I'm doing some changes to my central heating system which involve moving two rad tails and have discovered that I cannot drain the system.
All the rads are turned off to minimise the water loss but when I opened the drain valve nothing comes out (well just a trickle).
I checked for blockage at the drain valve and no problem.
I went to the old tail and turned the tap on, and the flow increased but only slightly, so I decided to go and check the header tank.
What I discovered is that the header tank is full indicating a blockage in the feed from the header tank. I also suspect a partial bloackage elsewhere as it won't drain when I turn the rad valve on at the old tails.
What I did discover when I went into the roof is that the header tank had a brown geletanous substance on the surface and it is obvious that if this is in the pipes, then I have a real problem.
The heating was refilled with Furnox inhibitor when the main hot water system was upgraded professionally to a non-vented system a couple of years back.
Any clues about what this substance is and how I get rid of it. Call in an expert to flush out the system is an acceptable solution, and that is what I am minded to do, but I would like to know what this substance is and how difficult it is going to be to flush the system out.
Kindest regards
John