The answer to 'duct cleaning leaking water' is that a leaking water issue during duct cleaning is often caused by a clogged or damaged condensate drain line. This can happen when the HVAC system's condensation is not properly draining, causing water to back up and leak from the ducts.
Some common symptoms include visible water dripping from the ducts, musty odors, and potential mold growth. To fix the issue, you'll need to inspect and clean the condensate drain line, which may involve unclogging it or replacing damaged sections. In some cases, the issue may be with the HVAC unit itself, requiring a professional technician to diagnose and repair the problem.