A. Replace the wall inlet and plug the hose in again.
B. Check to see if old inlet is same type with contact points. If not; it may have push button that requires a latching relay.
C. When replacing the inlet, look to see if old one had tape on the inlet neck. When re-installing the vacuum, test for air leaks. If a slight hissing sound occurs at the inlet, additional tape by be needed for a snug fit.

You should determine your inlet is a low voltage inlet. If you are not sure, or suspect that it also contains 110 volt wiring to power an electrified powerhead, DO NOT ATTEMPT TO REPLACE THE OUTLET BY YOUR SELF – CALL FOR AN APPOINTMENT WITH A CENTRAL VACUUM TECHNICIAN.