Question about Omega Trane Furnace Draft Inducer Blower 115 Volt Variable Speed Fasco # A190

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Have a Trane XE90 furnace, when turning on heat this year for the first time the furnace blows an inline fuse that is on the output of the 24v transformer. Disconnected all wires from thermostat to furnace and then jumpered the red to white posts on the control board to turn on heat and still blows the fuse. Does not appear to be external to the AC unit or thermostat. Having difficulty reading schematic as it is very old, Does the 24V feed the sensors on the furnace such as the pressure switch? flame sensor? gas valve?, Where else does the 24V power go to that could cause a short?

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You could have a shorted gas valve.

Posted on Apr 20, 2017


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Posted on Jan 02, 2017

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SOURCE: Trane XE90 both ac unit and the furnace kick on at the same time

How about the Heating/cooling thermostat. Sounds like you better check it.

Posted on Jun 26, 2009

  • 9 Answers

SOURCE: i have a trane furnace that is between 10-20 years

dodgy relay possibly

Posted on Mar 06, 2010

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My first thought is, if you have to ask this question, you should not be playing with your HVAC because you will likely hurt yourself. But if you insist; What does the humidifier require 120 or 24V? If it is 24V, then you take it after the thermostat at the relay that turns on the rest of the system. If the humidifier wants 120V, take it from the switched portion of the above mentioned relay. Your heat pump is 240V, so one side of the humidifier goes to the relay, the other side goes to ground, not the other side of the 240V return. If your heat pump is connected through a GFI, this will likely trip the GFI, shutting down your heat pump.
Go download

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1 Answer

Hi :) I have the Trane Furnace that just turn on

on older tranes if 120v power is reversed it would do that try switching leads on pigtail to board. make sure to unplug first!

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hello Miss/Mrs/Mr,
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Trane is very picky about being a Trane dealer before they will even talk to you. But as far as trouble shooting a module there no guides. If the flame comes on then the fan does not shutting down the furnace it could be a fan relay failure or the fan module failure. The modules propose is to allow the furnace time to heat up before bringing on the fan so as to not blow out cold. Or the fan motor it's self could failing

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