80
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
426
Critical
Variable
capacity
outdoor unit*
Excessive Inverter
Alarms
After 10 faults within 60 consecutive minutes, the control will lockout. Inverter will flash codes 12 to 14 and 53.
NOTE:
The reference flash codes do not count towards this lockout condition.
To clear disconnect power to outdoor control and restart
427
21
Moderate /
Critical
Variable
capacity
outdoor unit*
OD Inverter DC
Peak Fault
The inverter has detected a DC peak fault condition
.
• If condition (55A or higher) is detected, outdoor unit will stop (compressor and fan) – moderate condition.
• Anti-short cycle is initiated.
• If peak current (55A or higher) occurs 10 times within an hour, system will lockout – critical condition.
•
Inverter LEDs will flash code 21.
•
If the unit is a XP20 or XP25 variable capacity heat pump, this error may occur entering or exiting a defrost cycle as the
compressor restarts after the 30 second compressor shift delay. If the unit was manufactured prior to 5817F and has frequent
alert code 427, then compare the inverter part number to the latest part number listed in the unit repair parts. Units produced
after 5817F have an inverter with updated software that includes compressor current slope logic to reduce the potential of
alert code 427 instances from occurring during defrost. Replace the inverter with the latest inverter if necessary.
•
Refer to the unit service documentation for detailed troubleshooting procedures.
Inverter flash code 21. The sequence is:
• Red LED: Two Flashes
• Green LED: One Flash
To clear, disconnect and reconnect power to outdoor control.
428
22
Moderate /
Critical
Variable
capacity
outdoor unit*
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
To clear, disconnect power to outdoor unit and restart.
