Hot water problem.

[sav]

Got a customer with open vented hot water and heating

She's got a problem with an airlock. Hot tap in loft space basin runs then stops no water out of tap, cylinder is on ground floor it's worked for 10-15 years no problems. Also the kitchen and bathroom down stairs runs then stops.

Any idears?

 

[Riley]

Can you do the old hand over a mixer trick

 

[sav]

Done that before and it sorted but it's come back. I'm thinking it's a problem with the hot water having to go up to the loft causeing an air lock poss as the cylinder is down stairs.

 

[JCplumb]

Find the highest point of the feed pipework and stick an aav on there.

 

[sav]

Was thinking of fitting a small instantaneous water heater for the loft basin and cap off the hot water feed to the basin from the cylinder. Would that sort it?

 

[Matt06]

Is there negative head pump ?

Pressure ok on the little vessel?

Any leaks round pump causing the vessel to loose its little precharge to start the pump up?

 

[sav]

No pump buddy

 

[Matt06]

Dead mouse in the cistern outlet ?

anyone changed taps or turned a valve slightly

changed water level in the cistern

Sorry I'm just saying some random ideas

 

[sav]

She has had new kitchen sink taps. Half turn disk type ones. Would that have cause dthe issue?

 

[Matt06]

Is it all the hot taps just bath , loft and kitchen ?

If the cistern was drained to change taps could have let some rubbish down

If its all hot taps I would bung cold feed to hw cylinder and drain cylinder let cistern fill then let water go and hopefully will clear air lock / debris if that is the issue

or you could run some mains in to the hot

 

[sav]

All of them bud.

 

[Matt06]

If it was me I would try above first, bung cylinder feed in cwsc drain hot water cylinder.

open highest tap or all hot taps and pull the bung on the cwsc and see if that clears any crap that could be restricting the cold feed to the cylinder

With a bit of luck its just a bit of crap that ll fall in to the bottom of the cylinder