Hi all: I'm looking for some information regarding the IFC (Integrated Furnace Control) board on my "American Standard" residential forced air gas furnace.
The furnace was installed in August 2015. The furnace is model # AUH2C100A9V4VBA. My home also has a Gibson A/C condenser unit as part of the furnace setup.
The outdoor A/C condenser/compressor unit is a Gibson/Nordyne Model JS5BD-042KA (3.5 Ton) that has just a simple 1-pole contactor and one start/run capacitor under the service panel.
The IFC board in the furnace is an "Emerson Climate Technologies", with the following identifying information on the
board: "CNT06585" and "50V54-571-01" and "D343687P02" and "59-4760 rev. G" So basically my system is a straight forward 1 heat/1 cool set-up.
Here is my issue: In the outside A/C condenser/compressor unit I mistakenly connected one of the contactor coil wires (24 vac) to the L2 Hi-voltage line and blew out the thermostat and blew the 5 amp fuse on the IFC board. After cleaning up that mess (a new thermostat, etc.) and correcting the wiring issue, all is well with the HEAT side of things.
However, now when I flip the thermostat to "cool" the outside A/C compressor and the compressor fan runs as it should but the blower motor in the furnace will not come on.
Also when setting the fan switch on the thermostat to "On" the furnace blower will not run.
All is well with the heat side when the thermostat is in "Auto (fan) and "Heat". No problem there.
Additionally, when I manually jumper out the appropriate terminals on the ICF terminal block (jumper R to G) to turn the blower on, it will not come on.
From what I can tell there are 3 fan/blower relays on the IFC board itself that control the different blower speeds. One for the heat side of things, one for the A/C, and one for when the blower is in the manual "On" mode.
The red and green blinking LED's on the IFC show everything is fine. No faults. Again, the heat side of things in "auto" all works fine, there is just no blower when running the A/C and when the thermostat is in FAN -"On" mode.
Here is my question:
Is this true? Are there 3 relays that control the blower/fan for each scenario?
I really don't want to replace the ICF board. Maybe just the blown relays (if that is the issue) on the IFC board itself.
I have yet to pull the IFC board out and check the foil side of things for any damage (burnt foil, bad solder joints, darkened components, etc.).
I have the ability to do component level repair based on my electronic tech background.
Any thoughts or suggestions from the community would be appreciated.
I do not think this matters but I'm located in the Southeast Michigan area.
Thank you in advance... (5/5/2021 .. 10am est)
The furnace was installed in August 2015. The furnace is model # AUH2C100A9V4VBA. My home also has a Gibson A/C condenser unit as part of the furnace setup.
The outdoor A/C condenser/compressor unit is a Gibson/Nordyne Model JS5BD-042KA (3.5 Ton) that has just a simple 1-pole contactor and one start/run capacitor under the service panel.
The IFC board in the furnace is an "Emerson Climate Technologies", with the following identifying information on the
board: "CNT06585" and "50V54-571-01" and "D343687P02" and "59-4760 rev. G" So basically my system is a straight forward 1 heat/1 cool set-up.
Here is my issue: In the outside A/C condenser/compressor unit I mistakenly connected one of the contactor coil wires (24 vac) to the L2 Hi-voltage line and blew out the thermostat and blew the 5 amp fuse on the IFC board. After cleaning up that mess (a new thermostat, etc.) and correcting the wiring issue, all is well with the HEAT side of things.
However, now when I flip the thermostat to "cool" the outside A/C compressor and the compressor fan runs as it should but the blower motor in the furnace will not come on.
Also when setting the fan switch on the thermostat to "On" the furnace blower will not run.
All is well with the heat side when the thermostat is in "Auto (fan) and "Heat". No problem there.
Additionally, when I manually jumper out the appropriate terminals on the ICF terminal block (jumper R to G) to turn the blower on, it will not come on.
From what I can tell there are 3 fan/blower relays on the IFC board itself that control the different blower speeds. One for the heat side of things, one for the A/C, and one for when the blower is in the manual "On" mode.
The red and green blinking LED's on the IFC show everything is fine. No faults. Again, the heat side of things in "auto" all works fine, there is just no blower when running the A/C and when the thermostat is in FAN -"On" mode.
Here is my question:
Is this true? Are there 3 relays that control the blower/fan for each scenario?
I really don't want to replace the ICF board. Maybe just the blown relays (if that is the issue) on the IFC board itself.
I have yet to pull the IFC board out and check the foil side of things for any damage (burnt foil, bad solder joints, darkened components, etc.).
I have the ability to do component level repair based on my electronic tech background.
Any thoughts or suggestions from the community would be appreciated.
I do not think this matters but I'm located in the Southeast Michigan area.
Thank you in advance... (5/5/2021 .. 10am est)
source https://hvac-talk.com/vbb/threads/2228738-No-A-C-Blower-Mtr-Running-No-Fan-quot-On-quot-Running-After-Mis-wiring-at-A-C-Compressor-L2?goto=newpost
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