CTC Corrosion from Moisture Intrusion

Visible rust or water stains on or around the furnace cabinet.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Chronic condensate leaks, High humidity in furnace room, Backdrafting flue gases, Leaking humidifier attached to furnace

Safety first: Turn off power and gas if you suspect flue gas backdrafting.

Steps:

Inspect for active water leaks from the CTC condensate system or attached humidifier and repair as needed.
Check the flue pipe for signs of condensation or backdrafting (rust streaks, moisture). Ensure proper vent slope and termination.
Improve ventilation in the furnace room if humidity is high.
Severe rust on the heat exchanger or flue components requires professional inspection and possible replacement.

Hard 4/5

CTC Secondary Heat Exchanger (Condensing Models)

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