SERVICING
46
Troubleshooting
Electrostatic Discharge (ESD) Precautions
NOTE
: Discharge body's static electricity before touching
unit. Electrostatics can adversely affect electrical compo
-
nents.
Use the following precautions during air handler installation
and servicing to protect the integrated control module from
damage. By putting the air handler, the control, and the per-
son at the same electrostatic potential, these steps will help
avoid exposing the integrated control module to electrostatic
discharge. This procedure is applicable to both installed and
uninstalled (ungrounded) blowers.
1. Disconnect all power to the blower. Do not touch the
integrated control module or any wire connected to the
control prior to discharging your body’s electrostatic
charge to ground.
2. Firmly touch a clean, unpainted, metal surface of the air
handler blower near the control. Any tools held in a per-
son’s hand during grounding will be discharged.
3. Service integrated control module or connecting wiring
following the discharge process in step 2. Use caution
not to recharge your body with static electricity; (i.e., do
not move or shuffle your feet, do not touch ungrounded
objects, etc.). If you come in contact with an ungrounded
object, repeat step 2 before touching control or wires.
4. Discharge your body to ground before removing a new
control from its container. Follow steps 1 through 3 if
installing the control on a blower. Return any old or new
controls to their containers before touching any un-
grounded object.
Diagnostic Code
WARNING
HIGH VOLTAGE
DISCONNECT ALL POWER BEFORE SERVICING OR
INSTALLING THIS UNIT. MULTIPLE POWER SOURC-
ES MAY BE PRESENT. FAILURE TO DO SO MAY
CAUSE PROPERTY DAMAGE, PERSONAL INJURY
OR DEATH.
Refer to the Troubleshooting Chart at the end of this manual
for assistance in determining the source of unit operation-
al problems. The 7 segment LED display will provide any
active fault codes. An arrow printed next to the display indi-
cates proper orientation (arrow points to top of display). See
following image.
7 Segment
Diagnostic
Displays
Fault
Recall
Fault Recall
The integrated control module is equipped with a momen-
tary pushbutton switch that can be used to display the last
six faults on the 7 segment LED display. To display the faults,
follow the steps below.
NOTE
: The integrated control module must be in Standby
Mode (no thermostat inputs).
1. Press FAULT RECALL button (for 2 to 5 seconds). The
7 segment LED display will blink "
--
".
NOTE
: If FAULT RECALL button is not pressed long enough
(for 2 to 5 seconds, the control goes back to Standby Mode.
If the button is pressed for 5 to 10 seconds, control goes
back to Standby Mode.
2. Release the FAULT RECALL button. The 7 segment
LED display will show the most recent fault.
3. Subsequent pressing of the FAULT RECALL button will
recall a previous fault. At the end of the faults, the 7 seg-
ment LED display will show "
--
" and go back to Standby
Mode.
NOTE
: Consecutively repeated faults are displayed a max-
imum of three times. If the FAULT RECALL button is left
untouched longer than 3 minutes, the control goes back to
Standby Mode.
To clear the error code history:
1. Press FAULT RECALL button until the 7 segment LED
display blinks "
--
".
2. Release the FAULT RECALL button. The 7 segment
LED display will show "
88
" and clear the faults.
NOTE
: If FAULT RECALL button is help pressed for longer
than 15 seconds, control goes back to Standby Mode.
