pressure loss

[dom brennan]

hi guys

just a quick question just been round to my mates house and he said the boiler is working fine until he switches he's heating off then the pressure goes to zero. its discharging out of the PRV. my first thought was to fit an external expansion vessel on the return as I'm not gas safe. any ideas would this sort the problem.

many thanks Dom

 

[ShaunCorbs]

if it wont hold pressure no point in fitting a ev, first call need to sort the pressure loss which means you need to be gas safe

 

[dom brennan]

it holds pressure its fine while the heating is on as soon as you turn it off the pressure drops.

 

[ShaunCorbs]

it holds pressure its fine while the heating is on as soon as you turn it off the pressure drops.

what pressure when the heatings on as the pump will produce a bit, but time to call a gas safe eng out

 

[dom brennan]

probably pass the job onto my boss just thought i would have a go to fix it, never mind thanks anyway