How to Clean Out Condensation in a Furnace


Cleaning out condensation in your furnace will keep it running efficiently. Dirt, dust, mold and mildew build up in a furnace, creating clogs and reducing air flow. When a condensation drain line has excess water due to clogs, that water can back up and cause a leak in the unit. Regular maintenance that includes cleaning the furnace condensation line will eliminate this problem.

Things You'll Need

  • Bleach
  • Wet/dry vacuum
  • Furnace filter
  • Turn off the furnace and disconnect the circuit breaker for the furnace.

  • Unscrew the cap off the access pipe located on the exterior of the furnace.

  • Pour 1 cup of bleach into the access pipe to remove any build up in the condensation line. Restore power and turn on the furnace.

  • Remove the filter off the outside drain line after disconnecting power again if you have a stubborn clog bleach will not remove.

  • Attach a wet/dry vacuum to the condensation drain line. Suction any condensation from the line and dislodge any clogs.

  • Discard the filter in the furnace and replace with a new one.

  • Flip the switch on the circuit breaker to restore power. Turn on the furnace.

Tips & Warnings

  • Repeat maintenance steps once a month.

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