A multi-functional cleaning system usable as both a vacuum cleaner and a steam cleaner includes (a) a body having a motor assembly for generating suction and a dust collector for collecting foreign matters, (b) a first cleaning head, such as a vacuum nozzle, detachably coupleable to the body and having an inlet for directing the foreign matters into the dust collector, and (c) a second cleaning head, such as a steam cleaning head, detachably coupleable to the body and having an outlet for directing steam onto a surface. Attaching the body to the first cleaning head forms a vacuum cleaner configuration while attaching the body to the second cleaning head forms a steam cleaner configuration. Electrical wiring and connectors enable operation of the blower motor only in the vacuum cleaner configuration, and include protection against water ingress that can cause malfunctioning or create a safety hazard.