A water-jetted bath has circulation plumbing in addition to its ordinary drain and overflow. A leak noticed with the jets running is useful history, but it does not prove which fitting failed or rule out other water paths. Stop using the bath, keep clear of wet electrical equipment and have the complete installation assessed without repeating the leak.
Stop using the leaking bath
Do not keep starting the jets to reproduce a known leak. Stop bath use and keep people away from wet electrical equipment. If water reaches an outlet, cord, ceiling light or the place you would stand to disconnect power, do not touch it. Arrange safe electrical isolation and the appropriate leak assessment.
Record what you already observed: water at the access area, a stain below, dripping during jet operation or water appearing after the bath drains. A safe photograph and the time it happened help without adding more water to the damage. Water dripping from a ceiling light has separate electrical precautions.
The circulation circuit is an additional water path
A whirlpool moves bath water through a suction fitting, pump and jet plumbing. The Hydro Systems Designer manual identifies the suction intake and pump connections separately from its waste-and-overflow installation. The ordinary bathtub drain is not the only water-bearing assembly.
That layout makes jet-use history useful, but it does not identify one failed pump seal or union. Water can travel along a component before dropping elsewhere, and splashing or another tub connection may coincide with operation. A dry-looking drain joint does not certify the circulation circuit or establish that every water path is sound.
Do not turn an installation test into a leak-finding experiment
The MTI Solutions manual requires inspecting and testing the complete equipment before final installation and enclosure. It says leaks or operating problems must be resolved before installation is completed. Hydro likewise says not to install a system that is leaking.
Those are installer checks in the documented installation setting. They are not directions to refill an already leaking upstairs bath, run its pump for a fixed period or remove an access cover beside wet powered equipment. Have the provider establish safe access and the appropriate test for the installed bath.
Pass the complete history to the service provider
Provide the bath model, available installation documents and whether the leak followed renovation, cleaning or earlier work. Ask for assessment of the circulation plumbing, waste and overflow, water supply, support and accessible surrounding damage as relevant. The symptom should guide that investigation rather than preselect the repair.
Ordinary bathtub ceiling-leak guidance covers other timing patterns. Jet-line cleaning is not a leak repair, and the required suction cover must remain intact. Hydro assigns service beyond its listed owner care to a qualified representative. Do not tighten circulation unions while powered or disturb wiring. Resume use after the actual repair and required checks, with water-damaged materials addressed too.