Questions about repairs and parts for Coleman furnaces, air conditioners and heat pumps for manufactured homes. Click here for Coleman parts.
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Did a pre-season test Friday 10/18/13 and Coleman DGAH077BBSB / LP furnace failed to come on. Viewed 3 green flashes on control panel diagnostic codes. Searching around THIS WEBSITE, found quick tip about the booster motor, aka induced draft motor (IDM) not working do to possible corrosion. SO, I removed 4 screws on black IDM cover, pulled cover away from opening in IDM assembly. The motor has 3 screws that hold it in the tube. I do not think it is possible to remove the motor without removing the entire assembly. I removed 2 of the 3 visible screws holding the motor to the assembly (one is in the back and inaccessible). This loosened it enough to drop it down 1-2" and see the fan blades on the top of the motor. I used a shop-vac on BLOW to spin the fan blades for 5-10 seconds. Then I reassembled all screws, turned on power to furnace, set thermostat. The IDM came on and the furnace operated normally. Thanks to one piece of info found here! Wow!
Good deal!!! The motor will come out. If you ever have to do that again, look into the bottom of the assembly. You will see 2 machine nuts, they hold the motor to that 3 screw bracket. Remove the machine nuts, the motor will fall away from the bracket. Remove the 3 screws holding the bracket and then remove the bracket and motor with blade attached from the tube. Easy to oil the bearings once everything is apart.