Very basic inquiry - my system won't work when pressure from radiator loop or hot water loop falls below a certain level. Both have fallen below this level although gas supply is fine.
What do I need to do to raise pressure again on both hot water & radiator loops so that there is enough pressure for main boiler to work again?
Many thanks
What do I need to do to raise pressure again on both hot water & radiator loops so that there is enough pressure for main boiler to work again?
Many thanks
