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Carrier electric furnace (air handler) stopped running

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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The 5 amp fuse may be bad, they go quite often, and they are exactly the same as the car ones. Check the fuse with a meter. If its OK turn the unit on and check for voltage going to the blower fan. You should get a reading between at least one pair of wires. The unit should have a schematic on it somewhere, check it to see which wire pairs are used for the variable speeds of the fan.

Posted on Nov 09, 2014

Testimonial: "Hi Petronius, thanks for your reply. The 5amp fuse is good and the blower motor is powered. Any other thoughts? I checked all 3 temp limit switches with an ohmeter and they all ohmed out at 0.00. They are HH19ZA950 switches (the clicker type). Even if they were bad, that wouldn't keep the blower from running, or would it?"

  • Dave Strasinger
    Dave Strasinger Nov 12, 2014

    hanks for your reply, Petronius. The 5amp fuse is good and the blower motor has power running to it (it is humming lightly). Any other thoughts? I checked all 3 temp limit switches with an ohmeter and they all ohmed out at 0.00. They are HH19ZA950 switches (the clicker type). Even if they were bad, that wouldn't keep the blower from running, or would it?. How should I test the run capacitor and blower motor? I only have a basic multimeter that can test ohms, DC amps, 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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tborn6
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you need to go oside and look for a red reset button on the unit. you tripped the high ressure switch when you let your filter get that dirty. go check on this and when your done if it still is not working then ask me more.

Posted on Jan 25, 2009

  • 10 Answers

SOURCE: approx 2 years old. quit working during recent

it sounds like the contactor is not pulling in . corrision maybe even a bug could prevent it from pulling.

Posted on Nov 22, 2009

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