No hot water on gravity system?

[macka09]

Ok. I know it's definitely something with the recent work. The vague info I've been given leads me to think a gate valve has failed. I'm sure the chap said he's turned the immersion off.

 

[brum]

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?

good call but it may be a tad easier to cross kitchen taps and blow back mains into hw tap back into tank..brum

 

[macka09]

Is it as simple as putting a hose on the cold tap an opening them both? Never done it before

 

[Best]

If it is just a simple air lock in the hot pipework (probably cold feed to hot cylinder) then just put the cold through the hot. I do it on the bath mixers where the cold & hot are both from gravity (cwt) supply. Even though they are basically the same pressure, if you open the hot tap on a bath mixer & holding your hand over the outlet, just turn cold full on & hold for about 10 seconds at least & air is blasted up the cylinder feed.
Other sure way is to join hot washing machine valve to the mains cold w.m. valve using a w.m. hose.
Or remove the neck from kitchen sink mixer & hold your hand over the hole while turning hot & then mains on. You normally cant keep the neck in as the neck divides the supplies on modern mixers.

 

[Leo21]

Are we taking about no hot water through the taps, or cold water running through hot tap? As in not heating or not running?

 

[macka09]

Not running through hot tap

 

[Leo21]

Not running through hot tap

I shall correct my response to, Gate valve shagged. Got a bung kit?

 

[macka09]

Bung kit?

 

[Leo21]

Rubber cones that you stick up the cold feed and vent. They vacuum the system, so you can change the gate valve with the tank full.

 

[tamz]

More likely to be an air lock as whoever did the work previously wouldn't have left it not running.
Blow the mains up through the hot