I have an old Lennox unit. The AC still runs fine. Heater quit on me back in March. not sure if the elements or what. winter coming soon and need to get this up and running again
find out what kw the heat strip is. there should only be about four screws holding it in and a plug for the wiring. not hard to replace if you can buy one.
I would first check the fuses, Had this problem once and found fuse blown, replaced and had not trouble for 2 years. Fuses in the panel were fast acting type, replaced with slo-blow fuses. You can buy you a multimeter for about $8.00 at many discount and hardware stores. Turn off the power to the unit, Place the multimeter to AC volts 500V scale and check to make sure you have no voltage on either side of fuses. Remove fuses one at time and check on ohms X 1 scale. You should have around 0 to 50 Ohms on meter, If you have infinity replace fuse or fuses and try. Would make sure to use slo-blo fuses, Much more expensive but will save money in long run. If fuse blows again probably bad element
Check the fuse's first. If they are good and the blower fan motor is running, the problem is probably either the heating elements or a disc limit is bad. The best way to check these components is ohm them out with a multi-meter. If you have not worked with electricity before I would call a qualified service tech to check on this problem as you are working with high voltage and it can be very dangerous. When you find which part is bad you can call a certified Lennox dealer (just look in the phone book) and give them the model number of the unit. Lennox is very good about keeping parts in stock even on older units.
