Water while the machine is idle suggests a pressurized supply path or internal inlet issue.
The service call is clearer when it names the machine, connection type, location of the shutoff, and stage of the cycle when water appears. Moving a heavy appliance can stress a hose or damage flooring, so agree on access and responsibility before pulling it out.
Keep this boundary: A plumber may not repair internal appliance components. Confirm the trade boundary before paying for a visit that cannot address the likely fault.