"pressure has dropped"
it must have a pressure gauge for you to make this statement
it must be a pressurized system
it must have a means of topping up pressure
it must have a filling loop
(either external or built in internal)
try reading the user manual that came with the boiler to top up low system pressure
if you dont have a user manual try googling
boiler make/model how to top up pressure
ie vokera (then model) how to top up pressure
failing that try youtube
vokera (then model) how to top up pressure
if all else fails ring vokera customer services
they will help you if all it requires is topping up pressure
have boiler manual or download manual ready when talking to vokera
Asbestos, March 2017