Mitsubishi Electric Outdoor Unit Condensate / Defrost Water Drainage Issue

Water dripping from outdoor unit or excessive water around base

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Possible Causes

Blocked outdoor drain holes or tray, Ice buildup during defrost, Improper installation of optional drain kit, Clogged drain hose (if fitted)

How to Fix / Troubleshooting

Safety first: Turn off power before working around the outdoor unit.

Steps:

  • Identify normal vs abnormal: Some water dripping from the outdoor unit during cooling or defrost is normal. Excessive pooling or leakage into unwanted areas is not.
  • Clear drain paths: Inspect and clear any debris from the outdoor base pan drain holes. If a drain kit is installed, ensure the hose is not blocked or kinked.
  • Check unit level: Ensure the outdoor unit is level or slightly sloped toward the drain outlet.
  • Cold climate considerations: In freezing conditions, ensure defrost water can drain away without refreezing around the unit.
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Repair Difficulty

Very Easy 1/5

Required Part

Outdoor Drain Tray / Drain Kit
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