No hot water in cylinder

[nealie]

Hi - I'm new to this forum...just registered as I need to upgrade my old heating system. A current problem I have is no hot water. I have an old Glow Worm boiler ...indirect vented system with no motorised valves and no thermostat on the hot water cylinder. The cylinder does not heat the water up even though the radiators get hot - I have felt the top indirect feed - red hot! but the bottom feed is cold/luke warm - is this likely to be a blockage or an air lock? Any thoughts appreciated ...thanks - Neal

 

[Ermintrude]

Do you have water in primary's? 28mm pipes? Do rads work when pump is on?

 

[nealie]

Hi again - yes radiators get really hot when pump is on - pump deffo going as it vibrates

 

[nealie]

Shouldn't the hot water cylinder heat up through just the boiler being on? - I thought it did this through convection or something!

 

[nealie]

Hi all - thanks for all the help guys. I have decided that my problem is either an air lock in the primary cct or a blockage (sludge) so I will try the old faithful trick of a hose pipe in the vent pipe and flush it through. If that doesn't do the trick I will change out the cylinder. All the best -

 

[Rickster123]

:censored: Glad we could help....

 

[nealie]

found problem.... heating cct header tank empty and ball-cock stuck in the horizontal position!!! Freed the ball-cock off...filled tank up and pushed air out with hose pipe....... hey presto...hot water :8:

 

[snowhead]

Good to have an update.

 

[Ermintrude]

Doh dry primaries!

 

[Masood]

found problem.... heating cct header tank empty and ball-cock stuck in the horizontal position!!! Freed the ball-cock off...filled tank up and pushed air out with hose pipe....... hey presto...hot water :8:

Which is exactly what Ermintrude said in post #2! - "Do you have water in primary's?"

 

[Rickster123]

He knows his stuff that pink spotty cow!

 

[happyflyer]

Why not now check where all that water went 10 gallons or so may have been venting rads and fit a new balltap

 

[jtsplumbing]

As you now have hot water and are going to upgrade system don't do anything else ! as most of it will be replaced anyway,

 

[nealie]

Many thanks again for your advice.... appreciate it.