Re start system after water leak in mains

[GIGGLEBOX1]

Hi
I have a Valiant boiler eco TEC Plus with a Mega flow and Boss expansion tank.
I am not a plumber but just a practical guy and its Christmas !
The local water supply was broken with a major pump breaking don on Chrismas Day. Large area effected with no water supply. I tried running taps but only a dribble. I returned home late in day and supply was re establshed. However there is a Kettling noise from boiler and gauge on vessel shows zero. I have bled all radiators once but noise returns from time to time.


1 Should pressure gauge be zero all time.

2 do I just have to bleed rads again and again until noise goes away and by doing this am I adding more water to system


Thanks

David

 

[Scott_D]

Sounds like you need to top up the pressure

 

[GIGGLEBOX1]

Can you tell me how to do that please i have an error code of f23

 

[Riley]

You should not have lost pressure as a result of the mains being off do you have a check valve on your filling loop??