SERVICING
52
T
ROUBLESHOOTING
E
LECTROSTATIC
D
ISCHARGE
(ESD) P
RECAUTIONS
NOTE
: Discharge body's static electricity before touching unit.
Electrostatics can adversely affect electrical components.
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 person at the same
electrostatic potential, these steps will help avoid exposing the
integrated control module to electrostatic discharge. This proce-
dure 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
person
’
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
ungrounded object.
D
IAGNOSTIC
C
HART
HIGH VOLTAGE!
T
O
AVOID
PERSONAL
INJURY
OR
DEATH
DUE
TO
ELECTRICAL
SHOCK
,
DISCONNECT
ELECTRICAL
POWER
BEFORE
PERFORMING
ANY
SERVICE
OR
MAINTENANCE
.
WARNING
Refer to the
Troubleshooting Chart
at the end of this manual for
assistance in determining the source of unit operational prob-
lems. The 7 segment LED display will provide any active fault
codes. An arrow printed next to the display indicates proper
orientation (arrow points to top of display). See following image.
7 Segment
Diagnostic
Displays
Fault
Recall
F
AULT
R
ECALL
The integrated control module is equipped with a momentary push-
button 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 segment LED
display will show "--" and go back to Standby Mode.
NOTE:
Consecutively repeated faults are displayed a maximum 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.
