Service Manual -
HRG18xxS1P
508206-01
Issue 2140
Page 34 of 83
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Code
Inverter Flash
Code
Priority
Condition
Actual Displayed
Alert Text
Component or System Operational State
and Troubleshooting Tip
How to Clear
Alert Code
Red
LED
Green
LED
429
23
2
flashes
3
flashes
Service
Soon/
Service
Urgent
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.
Inverter flash code 23.
The sequence is:
• Red LED: Two Flashes
• Green LED: Three Flashes
NOTE:
Inverter normal operations with no error code present is as
follows. Red LED is ON and Green LED is OFF.
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.
Automatically clears
when the system
detects that the
issue no longer
exists.
430
26
2
flashes
6
flashes
Service
Soon/
Service
Urgent
OD Inverter
Compressor
Startup Fail
Compressor start-up failure.
• If condition is detected, outdoor unit will stop (compressor and fan) –
moderate condition.
• Anti-short cycle is initiated.
• If condition occurs 10 times within 60 consecutive minutes, the system
will lockout – critical condition.
• Inverter LEDs will flash code 26.
• Refer to the unit service documentation for detailed troubleshooting
procedures.
Inverter flash code 26.
The sequence is:
•
Red LED: Two Flashes
•
Green LED: Six Flashes
NOTE:
Inverter normal operations with no error code present is as
follows. Red LED is ON and Green LED is OFF.
•
Check refrigerant
•
Replace outdoor control board
•
Replace inverter.
To clear, disconnect
power to outdoor unit
and restart.
Table 12. Alert Codes and Troubleshooting