Ariston megaflow - no HW

[Rachh863]

I turned the mains off, opened the kitchen tap, put a new shower valve on. Put mains back on all seemed fine now today there is no hot water on the taps, only lukewarm but the bath HW is hot! Any suggestions welcomed.

New development: there is a bit of HW when taps are first opened then it's back to cold..airlock?

 

[picasso]

Did your new shower valve have check valves built in ?

 

[Rachh863]

Did your new shower valve have check valves built in ?

Hi,

Yes it did but there is no hot to the whole 5 bedroom house....hmmm

 

[picasso]

Your going to have to be a bit more accurate, no hot water anywhere or hot water at the bath, boiler switched on for heating and hot water ect

 

[Rachh863]

Your going to have to be a bit more accurate, no hot water anywhere or hot water at the bath, boiler switched on for heating and hot water ect

Sorry, ok so always HW on bath. Hot water on constant. And now when you run the basin taps etc initially a bit of HW then lukewarm...

 

[picasso]

Then i reckon you have a problem with the check valves on your new shower valve, can you isolate the shower to see if it makes a difference?

 

[Rachh863]

Then i reckon you have a problem with the check valves on your new shower valve, can you isolate the shower to see if it makes a difference?

But surely that would only affect that shower would it not?

 

[picasso]

If the hot check valve is stuck open cold water passes into the hot supply making it lukewarm at some taps.

 

[Rachh863]

Picasso,

I think you've just solved it...I stupidly didn't realise how much check valves would affect whole system..the other shower (old one) was knackered so I drilled out the check valves..good flow but maybe I'm the cause?