Carrier Excess Moisture / Over-Humidification

Whole-home Carrier humidifier corrodes furnace cabinet or nearby metal surfaces.

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Possible Causes

Humidity setpoint too high, Humidifier running with AC, Leaking humidifier cabinet, Poor duct design causing condensation

How to Fix / Troubleshooting

Safety first: Turn off power before inspecting inside the furnace or air handler.

Steps:

  • 1. Lower humidity setpoint: Follow Carrier guidelines for indoor humidity vs. outdoor temperature to prevent condensation.
  • 2. Inspect for leaks: Check the humidifier cabinet and connections for water leaks and correct any found.
  • 3. Seasonal operation: Ensure the humidifier is disabled during cooling season unless specifically designed for year-round use.
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Repair Difficulty

Easy 2/5

Required Part

Humidifier Cabinet Gasket/Seals
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