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Carrier air handler/furnace won't turn on

My Carrier KFCEH3101C15 air handler/electric furnace stopped working yesterday. It is a 2006 unit but it had been running very smoothly/quietly. I noticed the metal air filters were very dirty so I blew them out and replaced them. I tried to reset the system by turning the thermostat below the air temperature reading then turning off the two circuit breakers on the unit for a minute, turning them back on, then setting the thermostat to about 5 degrees above the air temperature reading. The thermostat then read "Aux Heat" as if it was trying to raise the temp in the house but the air handler never kicked on. I turned the fan switch from auto to "ON" but the fan motor did not work. It appears there is no power to the air handler/furnace. I took the access panel off and exposed the blower motor and a-coil and the blower motor felt warm to the touch. The unit has not worked for 24 hours, so either it is retaining heat or it is getting juice but not working. I can't see an obvious reset button anywhere...does anyone know what might be wrong? Could it have overheated because of the dirty air filters, and if so, why won't it reset or how can I troubleshoot and get it running again? I see a lot of wiring and a circuit board inside of the box but no reset buttons or sliders and no fuses to check except a 5amp fuse on the circuit board that looks like a fuse you would put into the panel of a car. Please help--thanks!

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  • Dave Strasinger
    Dave Strasinger Nov 10, 2014

    11/10 update: I checked all 3 limit switches (part# HH19ZA950) with an ohmmeter. I depressed and released the snap action surface of the switches a dozen or so times and each time the ohmmeter indication jumped up when I depressed the switch then dropped-off to 0.00 ohms when I released, which I believe indicates a good switch (please confirm?) One other thing; after I re-installed the switches and reset the breakers I set the temp on the thermostat to a few degrees above room temp and I could hear the blower motor humming lightly. I cycled the breakers on the furnace and could hear a switch click inside the panel. The humming indicates there is power to the blower motor, but nothing is operating. I don't know if the heater elements are heating-up because I can't see them. Thoughts?

  • Dave Strasinger
    Dave Strasinger Nov 12, 2014

    Hi Cris, thanks for your reply. How do you recommend testing the run capacitor and blower motor to verify failure? I have a basic multimeter but the sources I've found say I need a multimeter with an "MFD" setting to test (I couldn't find one of those at Sears, Home Depot, or AutoZone, so I need to know if there is another way to test it). Also, the blower motor has about 8 wires running to/from it--not sure where to place the wires to test.

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From what your saying the motor is hot to touch if that is the case the motor is bad need to be replaced.

Posted on Nov 08, 2014

Testimonial: "It was just mildly warm, which might have just been because it had been running prior to the unit dying on us. Is there an easy way to check the blower motor is operational? I have a simple electrical tester but I realy don't know what I am doing with it, beyond a non-powered ohm check on the limit switches. Thanks again for any advice you can give."

  • Dave Strasinger
    Dave Strasinger Nov 12, 2014

    Thanks for your reply, Cris. How should I test the run capacitor and blower motor? I only have a basic multimeter that can test ohms, DC ams, and voltage. The capacitor is just a standard run type with two posts on top, 4 leads per post. Since I don't have an "MFD" setting on my basic multimeter, to which setting should I set it? For the blower, there are no less than 8-9 wires...not sure where to start.

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