85
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
434
53
Moderate /
Critical
Variable
capacity
outdoor unit*
OD Inverter Comm
Error to Main
Control
•
Outdoor control has lost communications with the inverter for greater than three minutes.
• Outdoor control will stop all compressor demands – moderate condition.
• This alert code will occur if the outdoor unit power is turned off and the indoor unit power (24VAC to Lennox outdoor control)
remains on, or if the indoor unit power is turned off (24VAC to Lennox outdoor control) and the outdoor unit power is on. This
could occur while performing service or maintenance procedures on the indoor or outdoor unit.
•
The Lennox outdoor control will attempt to re-establish communication to the inverter when the alert code 434 occurs
by cycling the outdoor unit contactor off for two minutes. Upon energizing the contactor the Lennox outdoor control will
attempt to communicate to the inverter for three minutes. This process will be repeated three times in attempt to establish
communication before locking out.
• If the unit is locked out with a critical alert code 434, reset the system by cycling the outdoor unit power off and back on. Then
cycle the indoor power off (24vac to the Lennox outdoor control) and then back on.
• If this occurs three times in one thermostat call, the outdoor unit will lock out and display alert code 434 – critical condition.
• Check for loose or disconnected electrical connections.
•
Interruption of main power to inverter.
•
Inverter LEDs will flash code 53.
•
Refer to the unit service documentation for detailed troubleshooting procedures.
Inverter flash code 53., The sequence is:
•
Red LED: Five Flashes
• Green LED: Three Flashes
Automatically clears when the system detects that the issue no longer exists. If the unit is locked out with a critical alert code
434, reset the system by first cycling the outdoor unit power off and back. Then cycle the indoor power off (24VAC to the
Lennox outdoor control) and then back on.
435
60
Moderate /
Critical
Variable
capacity
outdoor unit*
OD Inverter
EEPROM
Checksum fault
Inverter internal error.
•
When this error occurs, the outdoor control will cycle power to the inverter by opening the contactor for two minutes –
moderate condition.
•
Outdoor control will cycle power to the inverter three times and then outdoor unit is locked out – critical condition.
•
Inverter LEDs will flash code 60.
•
Refer to the unit service documentation for detailed troubleshooting procedures.
Inverter flash code 60. The sequence is:
• Red LED: Six Flashes
• Green LED: Off
To clear alert code disconnect power to outdoor unit and restart.
