A drain pan collects water that reaches it. It cannot identify the source by itself. Water may run down from a connection, escape from the tank, or reach the pan from nearby equipment. The first wet point and the timing are useful clues.
Observe without opening equipment
If it is safe to approach, note whether the pan fills while the heater is idle or just after a heating cycle. Look for wet tracks on visible piping without touching hot surfaces or wet electrical equipment. Keep clear of any hot discharge.
Show the technician the pan and its outlet
Share a photo of the water level, visible connections, and the pan drain if present. Tell the technician whether the pan has overflowed or the leak is growing. They can trace the source and check whether the pan drains as intended.
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