Just had an Evocyl 150ltr unvented cylinder installed in loft.
I have a Potterton Suprima 60 boiler.
The problem is that when the hot water comes on in the morning cold water seeps through the tundish or seeps through the bathroom shower head which is an Aqalisa Quartz converted from a power shower.
The plumber suggested there was dirt in the PRV which he "blasted through" on several occasions and he even got Aqualisa to change out the brand new shower pump but water still trickles through.
Once I turn on any hot water tap, the leak stops immediately.
Pressure at the mains is 3 bar.
is there any plumbing fix that will solve this problem?