Dip Switch Operation; Low Voltage Comfort Control Operation; Furnace; Retro Fit Motor Control Board - Trane *UH2B060A9V3VA Service Facts

Dip Switch Operation

10. In order, turn on dip-switches 1 through 8, one at a
time.
11. Verify that the corresponding L.E.D. on the trouble
shooter is being turned on: Dip switch 1 on, L.E.D. DS-
1 is on.
12. Turn off dip switches 1 through 8 and verify each L.E.D.
goes off.
13. If the correct L.E.D.s do not turn on and off in the
proper sequence, check continuity of the 16 wire
harness with ohmmeter: pin 1 goes to pin 1, pin 2 to
pin 2, etc. through pin 16. If harness is good, replace
motor control board. If harness is bad, repair or re-
place.

Low Voltage Comfort Control Operation

14. Verify thermostat signals by jumping "R" to each of the
low voltage terminal connections as follows: BK, O,
YLO, G, W1, W2, W3. See exceptions below for
furnaces and retro fit motor control boards. The corre-
sponding L.E.D. on the troubleshooter should light
when "R" is applied. Verify L.E.D.s on the motor control
board light according to the applied signal: BK, YYLO,
fan. If L.E.D. on motor control board does not light and
16 wire harness is good, replace board.

Furnace

W2 will not light W2 L.E.D. on the troubleshooter due to
White-Rodgers ignition control's normally open switch.

Retro Fit Motor Control Board

Retro fit motor control board W2 is not connected and will
not light W2 on troubleshooter.
X343070P08
Trouble Shooting Kit
Service Facts
15