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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
406
Critical
Outdoor unit Compressor Open
Start Circuit
The required amount of current is not passing through the START current transformer. Automatically clears after current is
sensed in START sensor, or after power reset.
407
Critical
Outdoor unit Compressor Open
Run Circuit
The required amount of current is not passing through RUN current transformer. Automatically clears after current is sensed in
RUN sensor, one normal compressor run cycle, or after power reset.
408
Critical
Outdoor unit
Compressor
Contactor Welded The compressor is running continuously. Automatically clears one normal compressor run cycle or after power reset.
409
Moderate
Any system
component
Compressor
Voltage Low
The secondary voltage for the applicable system component has fallen below 18VAC. This may be due to:
•
Secondary voltage is below 18VAC.
• If this continues for 10 minutes, the thermostat will turn off the applicable system component.
Automatically clears after voltage is detected as higher than 20VAC for two seconds or after power reset.
410
Moderate
Outdoor unit
Open Low
Pressure Switch
Unit low pressure is below the required limit.
• Check operating pressures.
•
Low pressure switch opens at a specific pressure (system shuts down) and closes at a specific pressure (system restarts).
Automatically clears when the system detects that the issue no longer exists.
411
Critical
Outdoor unit
Low Pressure
Switch Strikes
Lockout
The low pressure switch has opened five times during one cooling or heating demand.
• Thermostat will shut down the outdoor unit.
•
Open low pressure switch error count reached five strikes.
• Check system charge using both approach and sub-cooling methods.
•
Reset by putting outdoor unit control in test mode or resetting low voltage power.
Automatically clears when the system detects that the issue no longer exists.
412
Moderate
Outdoor unit
Open High
Pressure Switch
The unit high pressure is above the upper limit.
• System will shut down.
•
Confirm that the system is properly charged with refrigerant.
•
Check condenser fan motor, expansion valve (if installed), indoor unit blower motor, stuck reversing valve or clogged
refrigerant filter.
•
Confirm that the outdoor unit is clean.
Automatically clears after the high pressure switch closes or a power reset
