Problem: Electric heat will not come on or fan blower on the air handler will not come on.
Answer: 1. First and most important, Please make sure your electrical power is turned off before trying to repair or inspect any type of electrical appliance. I would recommend that you purchase a Volt Ohm meter tester for some of the troubleshooting procedures listed in this section. I always liked to use an Amprobe type meter when testing electric furnaces because this type of meter will allow you to clamp around an electric wire, let you see the current, and see if the fan or electric heater is working or not. This electric meter will let you see the amps (current) that is being used by a component. Please click here if you would like to see the Amprobe type meter that we sell. We have three really good informative YouTube videos that were made by AC Service Tech LLC, Mark Bower, and Grayfurnaceman which show how to troubleshoot electric furnaces and sequencers. These great videos explain how electric furnaces operate. Thanks so much to AC Service Tech, Mr. Bower, and Grayfurnaceman for making these excellent informative videos!
2. Inspect the inside of the air handler or electric furnace for burnt wires. I find burnt wires and connections to be a major problem in electric furnaces. Electric furnaces use lots of electricity. Any connections that are the least bit lose inside the furnace will cause a heat build-up, arcing, and eventually a completely burned off connection. Before long the entire wire will be burnt off. Please see the picture (compliments from one of our nice customers) below of a burnt heat sequencer. You can see where the heat build-up and arcing have caused the terminals to completely burn off the left side! This looks like a two-stack sequencer, because of the divisions in the layers of the sequencer:
3. Check your breakers or fuses inside the air handler. Again, make sure your power is off. A good electrical tester multimeter would be nice to test your fuses. Many air handlers have fuses in them like the ones pictured below. You can remove these fuses and test them with a multimeter or if you do not have a multimeter, install new fuses to make sure they have not gone bad.
4. If you still are not getting electric heat then you should test your sequencers to make sure they are working. I made myself a tester so I could get portable 24 volts without having the furnace power turned on by using an old fan center connected to a junction box with alligator clips attached to the fan center. Please click here if you are interested in a fan center.
When 24 volts is applied across the two bottom connections on this sequencer you should get continuity (a closed circuit) between the two terminals the one on the left M1 and the one on the right M2. You should also have continuity between M3 & M4. This might take 30 to 90 seconds after the 24 volts is applied before you get the continuity. You should hear a slight click when the contacts inside the sequencer make the connection. If you do not get continuity then you might want to purchase one of the sequencers that we have for sale on the following page: Please click here if you would like to see the sequencers we sell.
Below is the video by Grayfurnaceman on how electric furnaces operate: Thanks Grayfurnaceman!