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Old October 3rd, 2011, 10:12 AM
Brian Malaby Brian Malaby is offline
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Default Trane xe 70 furnace

Tran xe 70 unit will not come online for AC or heat. Blower won't come online.
There was a humming sound like a capacitor or some other device "amping up". This sound was present over the last few months. Now unit will not operate at all. Blower blades are not stuck
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Old October 7th, 2011, 08:27 PM
Mr T's Avatar
Mr T Mr T is offline

Join Date: Dec 2003
Location: LaLa Land, NW Ohio
Posts: 4,752

It's probably not the blower.

In heat mode the furnace will light and run for a few seconds before the blower will even try to come on. If this is not happening then you probably have a control or power issue. There should be a low voltage transformer in the furnace, that is probably what you are hearing if it is buzzing all the time.. Sometimes they are just noisy.

Look for a control board and see if there are any lights on or flashing. Try heat, cool and fan-on modes, listen for any clicks from the unit. Listen for the outside condensor coming on when the AC mode is turned on. If you dont have any of this then you will need a schematic and a voltmeter (and know how to use it) to troubleshoot any further.

FYI, if you have a digital thermostat and it has a working display, there could be batteries in it. A working display does not mean it has power from the furnace.
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Old December 22nd, 2011, 05:42 PM
globaltrade globaltrade is offline
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Default Thanks!

Thanks for sharing!
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