Service manual
SERVICING
118
TROUBLESHOOTING
ELECTROSTATIC DISCHARGE (ESD) PRECATIONS
NOTE: Discharge body's static electricity before touching
unit. An electrstaic can adversly 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 ther
person at the same electrostatic potentential, 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 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 un-
grounded 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 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
problems.
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
Display