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^^^^ That may mean the capacitor is blown on the main motor if you get a hum. Or did you say it works for AC? There are several safeties that have to all agree for you to get a flame and start the motor. The guys that mentioned the LED trouble codes are correct. There should be a sticker on the panel someplace that describes the fault code. Start there. Also, when you remove the inspection panel, it wont turn on. You may need to hold the switch so it thinks the panel is on. If the LEDs arent blinking, turn the unit off with the switch on the outside of the unit, have the thermostat calling for heat, and then turn it back on while holding the panel-removed-cutout-switch. This will reset the codes and then see what they say. If you cant see the LEDs, there is usually a small window on the panel that allows you to see them with the panel on.
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