No hot water on gravity system?

[macka09]

Hi all. Any suggestion on possible causes?
Trapped air? Gate valve stuck?

 

[Ch4 plumbing]

I'm an idiot and didn't read the post properly!

 

[Leo21]

Hi all. Any suggestion on possible causes?
Trapped air? Gate valve stuck?

You in the trade?

 

[IDCHAPPY]

Air lock would be the most possible option, unless it's controlled by a motorised valve.

 

[Ermintrude]

Nrv stuck open pump filled return on grav with air

 

[missplumb]

air trapped in the cylinder coil

 

[Dannyparty92]

Get a bit of hose pipe go up in your loft and go to the bigest header tank and the pipe that bends over it put the hose pipe in it and suck till you get water out this should clear the airlock. How old is the boiler?

 

[Leo21]

If it's a gravity system it will only be so air lock if it's been drained recently. Most likely cause is a seized ball valve in the f @ e tank. The water is lost through heat evaporation.

 

[macka09]

Sorry folks. This isn't a job I've been to as yet. I'm going to look tomorrow. I am in the trade but still very new to it. As I haven't been to the job I assumed an air lock or the gate valve on the cold feed to the tank is stuck shut.
Someone has changed the ladies cold feed tank which apparently just serves a hot water cylinder I haven't been told anything else.
That's why I thought about getting a little heads up.

 

[Leo21]

It'll be related to the tank change. Al, you need is water and heat to make it work.