alpha cb 50 loss of pressure

[sowts]

since changing the pressure gauge on the front of the boiler( involing part drain down of system) iam suffering from loss of pressure having to top up the system morning and night this has been happening for about two weeks

i cannot see any leeks anywhere

do i need to recharge the expansion tank (if so how do i do this)

please help me if wife has another cold shower then i am going to have more than a loss of pressure

 

[twgas]

if you drained system with prv then its probably got muck in and not shutting off so will need replacing. if this is ot the case then you either have a leak or pressure vessel needs recharging