Since the manufacturer has a policy of continuous product and product data improvement, it reserves the right
to change design and specifications without notice.
Service Facts
Trane
6200 Troup Highway
Tyler, TX 75707
For more information contact
your local dealer (distributor)
07/11
Component Failure Evaluation in Communicating Mode
The user inferface on
the door panel has
yellow or red flashing
LEDs other then the
COM FAULT
User interface on the door
panel is displaying a COM.
FAULT
Yellow-2, Yellow-4 and Red-3
LED flashing
Is the COM LED
flashing a device
count (one flash for
each unit on the COM
BUS)
Air-cleaner can not
generate a ERROR
CODE 91 on the comfort
control, fault is with other
unit.
Comfort controll is
displaying a ERROR
CODE 91
Like the furnace and air-handler's
users interfaces the air-cleaner stores
fault codes. Check air-cleaner COM.
light for device count (one blink for
each communicating device on the
COM. bus) If device count is present
ensure air-cleaner green light blinks
slow with indoor blower operation.
Clear fault log
NO
YES
YES
YES
NO
Is the COM LED
flashing fast
NO
Use 24 Volt Mode
Troubleshooting
Flow Chart
YES
If COM light is on
continues the unit is
wired in the 24 Volt
Mode. Rewire in
COM Mode
NO
Active communicating fault.
Check for 12-13 voltage DC
between Brown and Blue
wires at the air-cleaner
connection plug Refer to the
Interactive Troubleshoot
Guide for Communicating
Systems to identify source of
COM Fault
YES
Does the G1 LED
blink slowly with a
call for indoor fan
NO
Replace door
NO
Air Cleaner
operating
correctly.
Clear fault log
YES
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