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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
413
Critical
Outdoor unit Hi Pressure Switch
Strikes Lockout
The high pressure switch has opened five times during one cooling demand.
• Thermostat will shut down the outdoor unit.
•
Open high pressure switch error count reached five strikes.
• Check system charge using superheat and sub-cooling temperatures.
• Check outdoor fan operation.
•
Check for dirt or debris blocking air flow to outdoor unit.
•
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.
414
Moderate
Outdoor unit
High Discharge
Line Temperature
The discharge line temperature is higher than the recommended upper limit of 279ºF.
•
Discharge line temperature is greater than 279ºF.
•
Make sure coil is clean and airflow unobstructed in and out of condenser.
• Check system operating pressures and compare to unit charging charts in installation manual.
Automatically clears after discharge temperature is less than 225ºF.
415
Critical
Outdoor unit
Hi Discharge Line
Temp Strikes
Lockout
The discharge line temperature has been consistently higher than the recommended upper limit of 279ºF.
•
Discharge line high temperature error count reached five strikes during a single demand.
•
Make sure coil is clean and airflow unobstructed in and out of condenser.
• Check system charge using superheat and sub cooling temperatures.
•
Reset by putting outdoor control in test mode or resetting low voltage power.
Correct issue and cycle power to the system.
416
Moderate /
Critical
Outdoor unit
Outdoor Coil
Sensor Faulty
The outdoor coil sensor is either open, short-circuited or the temperature is out of sensor range.
• Outdoor unit control will not perform demand or time / temperature defrost operation. (System will still heat or cool.)
• This fault is detected by allowing the unit to run for 90 seconds before checking sensor resistance. If the sensor resistance is
not within range after 90 seconds, the control will display a moderate code.
•
Advances from moderate to critical after ten (10) minutes.
• Plug-in sensor harness correctly.
• Check resistance of sensor to determine if it is open, shorted, out of temperature calibration or out of ambient temperature
range. Replace if out-of-specifications.
• Automatically clears when outdoor unit control detects proper sensor readings.
If sensor is faulty and the system is reporting the condition as critical, replaced sensor. Reset power to clear alert code.
