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Old 01-13-2012, 10:40 PM   #16
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Trane XE80 worked yesterday - won't come on today


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I can't tell you how many on/off switches I've run into that are upside down. Its worth a try to put the switch in the opposite position for a moment to see if you hear anything from the furnace.
Beyond that it's metering at the junction box for power and then moving forward into the furnace if you have power or moving back to both sides of the on/off switch and beyond if the junction box has no power.
Thanks. I'll check into it tomorrow. The switch position is up the same as it was when I initially went up there to see what the problem is. Nobody has gone up there to flip the switch. We don't store anything up there at all and I would be the only person to go up there. Wife says she didn't go up there so it has to be something internal to the unit.
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Old 01-13-2012, 10:43 PM   #17
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Trane XE80 worked yesterday - won't come on today


Actually I should have got you to try jumpering W & R on the thermostat connections on the furnace board first but I was distracted by the disabled door switch.
Your furnace will not do anything if your thermostat or thermostat wires have failed. Connecting W & R bypasses all of that and is worth trying.
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Old 01-13-2012, 10:59 PM   #18
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Trane XE80 worked yesterday - won't come on today


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I have nothing. No lights on the indicator light.
Check for 120VAC to the transfomer. If it is present, check for 24VAC on the secondary side.
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Old 01-13-2012, 10:59 PM   #19
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Trane XE80 worked yesterday - won't come on today


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Actually I should have got you to try jumpering W & R on the thermostat connections on the furnace board first but I was distracted by the disabled door switch.
Your furnace will not do anything if your thermostat or thermostat wires have failed. Connecting W & R bypasses all of that and is worth trying.
I'll try that first. Do I unhook W at the controller and jumper W and R?
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Old 01-14-2012, 12:57 AM   #20
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Trane XE80 worked yesterday - won't come on today


Some boards have led's that are lit when there is no call for heat and others are only on when there is a call for heat. If the led was always on in your furnace before this trouble then jumpering R & W won't help. If you are not sure then it's a pretty quick test to try.
Turn the thermostat off.
On your board on the furnace the various 24V thermostat lines connect to a line of screws. Take a short length of wire and connect the screw marked W with the screw marked R . This directly bypasses the whole thermostat circuit to fire up the furnace. If the furnace imediately starts up when this is done then you know that your problem is somewhere on the thermostat circuit.
If nothing happens then take the jumper wire off again and you are back to working that voltage tester again to see where the voltage has stopped.

Last edited by how; 01-14-2012 at 01:21 AM.
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Old 01-14-2012, 01:03 AM   #21
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Trane XE80 worked yesterday - won't come on today


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I'll try that first. Do I unhook W at the controller and jumper W and R?

No, you can simply turn the thermostat (controller) "off" and jump up at the furnace control board. No wire needs to actually be removed from their screw terminal when you jump, not in the furnace or in the stat.
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Old 01-14-2012, 01:39 AM   #22
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Trane XE80 worked yesterday - won't come on today


Looking at the picture from the XE80 manual on post 3, a slow flash is normal.
No LED = check power.
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Old 01-14-2012, 10:16 AM   #23
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Thanks everyone!! Turns out the safety switch above the unit was bad.
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Old 01-14-2012, 10:19 AM   #24
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Trane XE80 worked yesterday - won't come on today


HHHmmmm that was interesting.
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Old 01-14-2012, 10:20 AM   #25
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Trane XE80 worked yesterday - won't come on today


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Thanks everyone!! Turns out the safety switch above the unit was bad.

How did you find that to be the problem?
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Old 01-14-2012, 11:33 AM   #26
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Trane XE80 worked yesterday - won't come on today


This safety switch?

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Old 01-14-2012, 05:56 PM   #27
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Glad you figured it out, nobody thought to mention that there is a fuse on the board on these units. Can't believe no one thought to mention that even though it was not the problem. Any shorts in the 24v will break the fuse and you will have no led light on the board. Just saying....
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Old 01-14-2012, 07:03 PM   #28
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Trane XE80 worked yesterday - won't come on today


Refer to post 3.
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Old 01-14-2012, 11:17 PM   #29
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Every board used in an American Standard or Trane 80% or 90% plus furnace has a fuse plugged into the board...
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Old 01-14-2012, 11:26 PM   #30
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Trane XE80 worked yesterday - won't come on today


Trane and Rheem were slow to start using this fuse with their gas furnaces. I have replaced many transformers in those brands because of this.

The diagram does not show a fuse.
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