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[Shackeng]

The gurgling noise suggests air/gas somewhere in the system to me.

[Sir Tigger KC]

The gurgling noise suggests air/gas somewhere in the system to me.

Yes and lots of it!  But I can't bleed any out.... 

It's possible the feed or vent pipes have been blocked if there's a bit of crusty stuff in the system.

That's possible as it's an old system.  I might drain it down tomorrow and refill.... 

[Doctor Gollum]

I think it's a Y/W plan as there's only one valve (3 way). The F/E tank seemed OK, it had water in it, the vent is clear of the water level and the ball valve operates OK.

I think the pump is OK as the rads get hot....  I'll check again though. 
 
Not a Fry's house Kevin! 

Piss off STEMO, yer not helping!   

That's nice. I won't bother then. 

That'll learn him for putting it on so bleddy early

[Sir Tigger KC]

I think it's a Y/W plan as there's only one valve (3 way). The F/E tank seemed OK, it had water in it, the vent is clear of the water level and the ball valve operates OK.

I think the pump is OK as the rads get hot....  I'll check again though. 
 
Not a Fry's house Kevin! 

Piss off STEMO, yer not helping!   

That's nice. I won't bother then. 

That'll learn him for putting it on so bleddy early

Pfft! 

[STEMO]

My lad has just complained that it's too warm in here. Phew!

[Doctor Gollum]

Just the missus to convince now... although the dog will probably side with her

[STEMO]

Just the missus to convince now... although the dog will probably side with her

She's ploughing her way home through the elements to cook my tea...





.......in my fickin dreams. 

[TD]

The gurgling noise suggests air/gas somewhere in the system to me.

Yes and lots of it!  But I can't bleed any out.... 

It's possible the feed or vent pipes have been blocked if there's a bit of crusty stuff in the system.

That's possible as it's an old system.  I might drain it down tomorrow and refill.... 

Might be worth adding something like this to the header tank before you refill and let it do a clean 

http://www.plumbworld.co.uk/fernox-f5-liquid-central-93-32297?utm_source=GoogleBase&utm_medium=GB&utm_campaign=GoogleBase&gclid=CMn7g43amdACFaIK0wodeJwPIQ

Then drain it out after a few days and refill again...

[Sir Tigger KC]

The gurgling noise suggests air/gas somewhere in the system to me.

Yes and lots of it!  But I can't bleed any out.... 

It's possible the feed or vent pipes have been blocked if there's a bit of crusty stuff in the system.

That's possible as it's an old system.  I might drain it down tomorrow and refill.... 

Might be worth adding something like this to the header tank before you refill and let it do a clean 

http://www.plumbworld.co.uk/fernox-f5-liquid-central-93-32297?utm_source=GoogleBase&utm_medium=GB&utm_campaign=GoogleBase&gclid=CMn7g43amdACFaIK0wodeJwPIQ

Then drain it out after a few days and refill again...

I've got a bottle of something like that lurking in the garage somewhere, but I wonder if it might do more harm than good on an old system. 

[driver115]

had a similar/same problem last year - the cold water feed pipe from the header tank had become blocked where the cold water feeding the system comes into contact with hot water, salts drop out of solution and occlude/block the copper pipe near this point ie first bend in the pipe in my case where the water slows up .I chopped out, removed and replaced this bend of copper pipe which has completely silted up, and this sorted the problem.

[Sir Tigger KC]

had a similar/same problem last year - the cold water feed pipe from the header tank had become blocked where the cold water feeding the system comes into contact with hot water, salts drop out of solution and occlude/block the copper pipe near this point ie first bend in the pipe in my case where the water slows up .I chopped out, removed and replaced this bend of copper pipe which has completely silted up, and this sorted the problem.

How did you work that out? 

What I don't understand is how I can hear air gurgling but I can't bleed any out.  Also it seems to be worse when heating the water. 

[Entwood]

had a similar/same problem last year - the cold water feed pipe from the header tank had become blocked where the cold water feeding the system comes into contact with hot water, salts drop out of solution and occlude/block the copper pipe near this point ie first bend in the pipe in my case where the water slows up .I chopped out, removed and replaced this bend of copper pipe which has completely silted up, and this sorted the problem.

How did you work that out? 

What I don't understand is how I can hear air gurgling but I can't bleed any out.  Also it seems to be worse when heating the water. 

Is it air gurgling or localised boiling as the water is not circulating properly ?? I had similar a few years back and it was also a blockage on the feed pipe on a bend ... insufficient water feed to fill the boiler tank, so what was in there was boiling and making one hell of a noise, took that bit of pipe off and replaced it using two compression joints and a short length of new pipe ..

[Sir Tigger KC]

had a similar/same problem last year - the cold water feed pipe from the header tank had become blocked where the cold water feeding the system comes into contact with hot water, salts drop out of solution and occlude/block the copper pipe near this point ie first bend in the pipe in my case where the water slows up .I chopped out, removed and replaced this bend of copper pipe which has completely silted up, and this sorted the problem.

How did you work that out? 

What I don't understand is how I can hear air gurgling but I can't bleed any out.  Also it seems to be worse when heating the water. 

Is it air gurgling or localised boiling as the water is not circulating properly ?? I had similar a few years back and it was also a blockage on the feed pipe on a bend ... insufficient water feed to fill the boiler tank, so what was in there was boiling and making one hell of a noise, took that bit of pipe off and replaced it using two compression joints and a short length of new pipe ..

No I don't think it's boiling.  Definitely sounds like air gurgling.   

[TD]

The gurgling noise suggests air/gas somewhere in the system to me.

Yes and lots of it!  But I can't bleed any out.... 

It's possible the feed or vent pipes have been blocked if there's a bit of crusty stuff in the system.

That's possible as it's an old system.  I might drain it down tomorrow and refill.... 

Might be worth adding something like this to the header tank before you refill and let it do a clean 

http://www.plumbworld.co.uk/fernox-f5-liquid-central-93-32297?utm_source=GoogleBase&utm_medium=GB&utm_campaign=GoogleBase&gclid=CMn7g43amdACFaIK0wodeJwPIQ

Then drain it out after a few days and refill again...

I've got a bottle of something like that lurking in the garage somewhere, but I wonder if it might do more harm than good on an old system. 

Some cleaners warn about using it with a boiler with an aluminium heat exchanger, plus if you have any 'weak' joints the cleaner will find them and you will possibly get a leak.
With my 30+ yr old boiler with a cast iron heat exchanger it was fine and I didn't get any leaks.
Afterwards the boiler was noticeably quieter and didn't work so hard 

If you decide to put a cleaner in it, remember to open the rads bleed valves (starting at the highest point) when draining the system otherwise water will remain in the rads.

Tho if you first drain it and try to refill it, if it wont refill then I guess it would suggest a blocked feed pipe as others have suggested 

[Sir Tigger KC]

I think I'm going to drain it today and refill it to see what happens. 

I put a bottle of descaler in an elderly heating system a few years ago and soon after the heat exchanger was leaking badly!  It was an expensive mistake as I ended up buying a new boiler! 

The bottle of cleaner that I have somewhere is more like the one you liked to though, so it's probably more gentle.  I'll read the instructions carefully before I use it!