It can release wastewater and does not provide a safe owner diagnosis. The system's condition and pressure cannot be assumed from silence.
What the observation means
A unit that has stopped may still contain liquid. Opening a connection also risks losing the correct sealing arrangement.
A useful next step
Stop fixture use and report the observed drainage problem. Let the appropriate professional assess the route. Do not loosen clamps, remove an elbow or disconnect a valve as an exploratory check, and do not stand over the connection while someone flushes.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.