Service Manual -
HRG18xxS1P
508206-01
Issue 2140
Page 73 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
428
22
2
flashes
2
flashes
Service Soon/
Service
Urgent
OD Inverter High
Main Input Current
The inverter has detected a high main input current condition.
• If condition is detected, outdoor unit will stop (compressor and fan)
– moderate condition.
• Anti-short cycle is initiated.
• If condition occurs 10 times within an hour, system will lockout –
critical condition.
• Inverter LEDs will flash code 22.
• Refer to the unit service documentation for detailed troubleshooting
procedures.
Inverter flash code 22.
The sequence is:
• Red LED: Two Flashes
• Green LED: Two Flashes
NOTE:
Inverter normal operations with no error code present is as
follows. Red LED is ON and Green LED is OFF.
To clear, disconnect
power to outdoor unit
and restart.
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.
Table 24. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes