Trane *UD2B060A9V3VB Installer's Manual page 24

Installer's Guide
* The diagnostics will indicate the specific fault through the following code:
GREEN LED AMBER LED
FLASH FLASH
1
2
3
4
Rapid
1
See Service Facts for additional troubleshooting
information.
Trane
6200 Troup Highway
Tyler, TX 75707
For more information contact
your local dealer (distributor)
RED LED
FLASH
1
2
3
4
5
6 1st stage pressure switch opened 5 times within one cycle--1 hour lockout
7
8
9
10
12
Solid
3 Double 2nd stage pressure switch open; system reverts back to 1st stage heat
Literature Order Number 18-CD31D1-5
File Number
Supersedes
Date
Since the manufacturer has a policy of continuous product and product data improvement, it reserves the
right to change design and specifications without notice.
ERROR
Flame Sensed when no flame should be present
Pressure switch stuck closed
1st stage pressure switch is open / not closing
Open thermal limit or open rollout
Open low voltage fuse
System lockout Retry
System lockout
Reverse polarity or poor grounding
Gas valve energized without call for heat
Ignitor relay failure internal in board. Replace IFC
Gas valve relay failure internal in board. Replace IFC
1st stage call for heat
2nd stage call for heat
W2 call present without W1
Y call present without G
Low flame sense current
Standby mode or call for cooling
18-CD31D1-5
18-DC31D1-4
06/11
Recycle