View Full Version : Trane UCP troubleshooting
03-16-2007, 12:04 PM
I had a Trane YCH unit where nothing was running. Power was on, fuses OK, no obvious problems. Following the instructions in the Voyager Microcontrols manual, I checked the UCP LED (it was on), then checked LTB terminals 6-9. There was OvDC, so I installed a new UCP and the unit started.
Being curious, I checked LTB 6-9 again, and the voltage is still 0. Normal should be 32vDC.
Am I doing something wrong, or is there still a problem with the unit?
03-16-2007, 05:22 PM
Stupid question - You cycled the power before replacing the board - right?
03-20-2007, 09:31 PM
like vbhvac said...did you shut down and power up the unit...sounds stupid but it matters..there are a few things that just lock out that UCP, and you will not measure I do beleive any dc volts at those terminals indirectly. What year is the unit?
03-21-2007, 10:43 AM
Yes, I shut it down and restarted it a few times before I replaced the board. The unit was manufactured 09/94.
It's been working fine for several days with the new board, but LTB 6-9 still doesn't have 32vdc like the book says it should.
300 Win Mag
03-21-2007, 07:37 PM
If the unit has an economizer, unplug it and recycle the power. Let me know what you find.
03-23-2007, 04:52 PM
No economizer, it's connected to a Barber Colman system.
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