System Diagnosis And Troubleshooting; Controller; Outdoor Unit Inverter - Nordyne iQ Drive Installation Instructions Manual

TESTS from the INSTALLER SETTINGS menu. Follow
the refrigerant charge adjustment procedure explained
above.
10. When charge adjustment is completed (if required), run
the system in cooling mode. This may also be done using
SERVICE TESTS although some diagnostic messages
are disabled in that method.
11. Check the FAULT STATUS screen (described above)
for any faults logged during the startup process. Any
message listed as "ACTIVE FAULT" refers to a condition
which either still exists or occurred within the preceding 5
minutes. Every fault or notifi cation should appear in the
FAULT HISTORY log which starts on the same screen.
The last 10 faults to have occurred are retained in this
list. Each new item pushes other logged faults down in
the list. The second line associated with each of the 10
entries includes the time and date of detection. While
the wording of fault messages is intended to provide a
reasonable indication as to the responsible condition,
the information conveyed by the abbreviated wording
is limited. Consequently the installer should refer to
training literature for further information in understanding
fault messages.
12. If needed, make use of information provided below
under Troubleshooting: What to Expect with Normal
Operation.
13. Independently confi rm operation of any accessories
installed with the air conditioning system following
instructions provided with that equipment.
14. Complete the remainder of confi guration settings and
entries as specifi ed above under Installer Settings and
Other Confi guration Entries.

SYSTEM DIAGNOSIS AND TROUBLESHOOTING

The following is a summary of normal and abnormal operation
for typical startup to check out the system. Reference is made
to INSTALLER SETTINGS and SERVICE INFORMATION
screens described above. Refer to training literature for
more details.
Diagnostic information for the air conditioning system can be
obtained from all of the following sources:
• Controller displays. Refer to training materials for
interpretation of fault messages which appear on the
Main, Fault Status, and Service Needed screens.
• Refrigerant system
measurements (using
instrumentation)
• LED indicator lights on each of the system's circuit
boards (see below).
14
pressure and temperature
standard fi eld service

Controller:

Normal - As soon as 24 vac power is applied, the blue
backlight of the controller should light up. The "iQ" splash
screen will display the software version.
Confi guration procedure has not been performed yet for
this system-controller combination, "CONFIGURATION
NEEDED" will be displayed across the top (alternating with
other information).
If the system has a Type "P" blower motor (shown on SYSTEM
CONFIGURATION and INDOOR FAN STATUS screens),
used in air handlers or G6 gas furnaces, the blower will self-
calibrate for 60 seconds as soon as System Confi guration is
completed.
All communications links in COMMUNICATION DATA
should show "OK". All information displayed in the System
Confi guration screen should be accurate.
Abnormal – If the display is not lit, check that 24 vac is being
provided between the "R" and "C" terminals in the thermostat's
back connection plate. If not, trace the connection of all
controller wires back to the indoor unit (furnace or air
handler). Check that connections are in accordance with
fi eld wiring diagrams and instructions.
If a SERVICE NEEDED screen with a red backlight is
displayed, a fault has been detected. A brief description of
the fault is displayed on the screen. Access to the FAULT
STATUS screen is permitted.
If communication with the outdoor unit is OK but the unit
size (in tons) shown on the System Confi guration screen in
wrong, contact the service representative of the equipment
distributor. The inverter may not have undergone its
initialization procedure, performed at the factory.

Outdoor Unit Inverter:

WARNING
ELECTRIC SHOCK HAZARD!
Disconnect power before servicing the outdoor
unit. Failure to follow these instructions may
result in electric shock or death. Trouble-
shooting the outdoor unit may require that
power be restored with the control panel
cover removed. Become familiar with the
control panel and hazardous voltage areas
before proceeding.
Time is required for inverter voltage to bleed
down after removal of line power. Wait at least
60 seconds after removing line voltage before
touching any inverter parts or wiring.
Normal – Examine the following with the control panel cover
off. The small red LED on the upper right side of the inverter
panel should be lit and on steady when power is applied to
the inverter. Refer to Figure 2.
If the System