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Here is a recent post from NHCS FSR, Ed Belles, regarding the failure of an IFC board on a two-stage condensing furnace:

I found this yesterday and thought it was worth sharing with you all. Someone had sent me an IFC (Integrated Furnace Control) Board from a two-stage condensing furnace. The story is that the board in the furnace failed multiple times over a four month period. After inspecting the control board, I found several small water marks on the control board that had shorted circuits in the board. The water marks are sometimes very hard to see in the poor lighting Technicians constantly work in. A good indication that it may be from water damage is to look at the Inducer Motor of the Furnace. Look underneath the motor and housing for evidence of water staining and rust marks. If they are present it may be an indication that the seal around the inducer to the bulkhead of the Heat Exchanger may need to be resealed as well.

(see photos below)

Image and video hosting by TinyPic

Image and video hosting by TinyPic

Image and video hosting by TinyPic Image and video hosting by TinyPic Image and video hosting by TinyPic Image and video hosting by TinyPic Image and video hosting by TinyPic Image and video hosting by TinyPic Image and video hosting by TinyPic Image and video hosting by TinyPic Image and video hosting by TinyPic Here is a recent post from NHCS FSR, Ed Belles, regarding the failure of an IFC board on a two-stage condensing furnace:

I found this yesterday and thought it was worth sharing with you all. Someone had sent me an IFC (Integrated Furnace Control) Board from a two-stage condensing furnace. The story is that the board in the furnace failed multiple times over a four month period. After inspecting the control board, I found several small water marks on the control board that had shorted circuits in the board. The water marks are sometimes very hard to see in the poor lighting Technicians constantly work in. A good indication that it may be from water damage is to look at the Inducer Motor of the Furnace. Look underneath the motor and housing for evidence of water staining and rust marks. If they are present it may be an indication that the seal around the inducer to the bulkhead of the Heat Exchanger may need to be resealed as well.

(see photos below)

Image and video hosting by TinyPic

Image and video hosting by TinyPic

Image and video hosting by TinyPic

 
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