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Table 19. Alert Codes and Troubleshooting
Initial notification of critical alerts will pop-up on the home screen and will be listed under notification menu. Minor and moderate alerts are found only under the notification menu. Moderate alerts
are not e-mailed to Homeowners. Dealers will get an email and code can be seen on thermostat under the installer notification section.
NOTE:
Anytime the word
DEVICE
or
DEVICE2
is used in this table, it will be replaced on all alert code notification screens with the actual offending device name, for example, thermostat, heat
pump, etc.).
Alert
Code
Inverter
Flash
Code
Priority
Condition
Applicable
Component
Actual Displayed
Alert Text
Component or System Operational State and Troubleshooting Tip
429
23
Moderate /
Critical
Variable
capacity
outdoor unit*
OD Inverter DC
Link Low Voltage
The inverter has detected a DC link low voltage condition
.
•
On a call for compressor operation, if DC link power in inverter does not rise above 180 VDC for 2- and 3-ton models, 250
VDC for 4- and 5-ton models within 30 seconds, the control will display a moderate code.
• If condition is detected, outdoor unit will stop (compressor and fan) – moderate condition.
•
An anti-short cycle timer is initiated. If condition occurs 10 times within a 60 consecutive minutes, system will lock out and
display alert code 429 – critical condition.
• The outdoor control anti-short cycle timer will time out and the unit will recycle the demand.
•
Inverter LEDs will flash code 23.
•
Refer to the unit service documentation for detailed troubleshooting procedures. Perform test function and verify inverter DC
link and line input voltage and current. Also check input to filter board and reactor before replacing inverter board. To perform
this test, go to
menu
>
settings
>
advanced settings
>
view dealer control center
>
tests
.
Inverter flash code 23. The sequence is:
• Red LED: Two Flashes
• Green LED: Three Flashes
Automatically clears when the system detects that the issue no longer exists.
Troubleshooting Suggestions:
•
Check wire connections (U, V and W) at inverter plug in harness and compressor.
•
Check the resistance of compressor windings. If not in range, replace compressor.
• Check compressor to ground. If ground issue, replace compressor.
• Check input power (Single Phase - 208/ 10%. If out of range, correct main power issue.
•
Check DC Link voltage and MICOM Sensing voltage. If out of range, replace inverter. if okay, possible mechanical issue with
compressor.
Go to outdoor unit service manual for detail troubleshooting procedures and require values for testing DC link voltages and
various insulation resistance characteristics.