Home Improvement Questions? Ask a Handyman for Answers
Adding water is not a function if the unit. It is
It is "plumbed " into the water supply and water is added as it is used through the flow and use of the system.
If you suspect your boiler is not getting the proper level of water you need to shut it down until its water supply can be verified. . A blockage of its feed or a broken or leaking pipe would be a possible cause. Also a supply valve could be turned all or partially off.
A professional should ve contacted to make sure the cold water valve is operating properly.