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