Carrier Air Conditioning

This alarm indicates that Compressor 1 in Circuit A is stuck in the 'on' position. The system will turn off all compressors to prevent damage.

This alarm indicates that Compressor 2 in Circuit A is stuck in the 'on' position. The system will turn off all compressors.

This alarm indicates that Compressor 1 in Circuit B is stuck in the 'on' position. The system will turn off all compressors.

This alarm indicates that Compressor 2 in Circuit B is stuck in the 'on' position. The system will turn off all compressors.

An alarm for low suction temperature in Circuit A has been triggered. The circuit will stop to protect the compressor.

An alarm for low suction temperature in Circuit B has been triggered. The circuit will stop to protect the compressor.

An alarm indicating high head pressure in Circuit A. The circuit will stop to prevent damage.

An alarm indicating high head pressure in Circuit B. The circuit will stop to prevent damage.

This alarm indicates high discharge temperature for the digital scroll compressor. Compressor A1 is locked off.

The system has detected that a fan or compressor is rotating in the wrong direction. The unit will shut down.

The unit has received an external command to stop immediately. It will not operate until the command is cleared.

The system is configured with more than two electric heat stages, which is not allowed. The unit will shut down.

There is a hardware failure with the serial EEPROM, which stores configuration data. The unit will shut down.

A critical failure occurred during data storage in the serial EEPROM. This requires immediate attention as it affects essential functions.

There is a hardware failure in the Analog-to-Digital converter. The unit will shut down.

Communication has failed between the main control and the Low Ambient Control Board (SCB2). Cooling function is disabled.

Communication has failed with the Expansion Valve Control Board. The Humidi-MiZer control is disabled.

Communication has failed with the Staged Gas Control Board. The system will stop gas heating.

Communication has failed with the second Staged Gas Control Board (SCB2). The cooling function will be stopped.

Communication has failed with the Economizer Control Board 1 (ECB1). The economizer and power exhaust will be stopped.

Communication has failed with the Economizer Control Board 2 (ECB2). The entire unit will shut down.

This indicates a failure with Compressor 1 in Circuit A. The system will attempt to restart the compressor up to 3 times automatically.

This indicates a failure with Compressor 2 in Circuit A. The system will attempt to restart the compressor up to 3 times automatically.

This indicates a failure with Compressor 1 in Circuit B. The system will attempt to restart the compressor up to 3 times automatically.

This indicates a failure with Compressor 2 in Circuit B. The system will attempt to restart the compressor up to 3 times automatically.

Compressor A2 in Circuit A has shut down due to low saturated suction temperature. This is a protective shutdown.

Compressor B2 in Circuit B has shut down due to low saturated suction temperature. This is a protective shutdown.

The head pressure in Circuit A is too high, causing the compressor to shut down or stage down. This is a protective measure.

The head pressure in Circuit B is too high, causing the compressor to shut down or stage down. This is a protective measure.

This alert means Compressor 1 in Circuit A has failed after exceeding the automatic restart limit. The compressor is now locked off.

This alert means Compressor 2 in Circuit A has failed after exceeding the automatic restart limit. The compressor is now locked off.

This alert means Compressor 1 in Circuit B has failed after exceeding the automatic restart limit. The compressor is now locked off.

This alert means Compressor 2 in Circuit B has failed after exceeding the automatic restart limit. The compressor is now locked off.

The temperature sensor for Circuit A has failed. The system will stop Circuit A to prevent damage or inaccurate readings.

The temperature sensor for Circuit B has failed. The system will stop Circuit B to prevent damage or inaccurate readings.

The sensor that monitors the evaporator discharge has failed. The unit will shut down completely.

The sensor measuring the outside air temperature has failed. The economizer function will be disabled, but the unit may continue to operate.

The sensor measuring the indoor space temperature has failed. The unit will shut down to prevent incorrect operation.

The sensor measuring the return air temperature has failed. The unit will continue to run, but may not control temperature accurately.

The sensor measuring the outside air humidity has failed. The system will switch to using only the outside air temperature for control.

The sensor measuring the indoor space humidity has failed. The system will use a default control method based on dry bulb temperature.

The sensor measuring the return air humidity has failed. The system will use a default control method based on differential dry bulb temperature.

The sensor used for space temperature offset has failed. The system will operate using the space temperature without the offset.

The sensor measuring the discharge pressure for Circuit A has failed. The system will stop Circuit A.

The sensor measuring the discharge pressure for Circuit B has failed. The system will stop Circuit B.

The sensor measuring the suction pressure for Circuit A has failed. The system will stop Circuit A.

The sensor measuring the suction pressure for Circuit B has failed. The system will stop Circuit B.

The system has detected a loss of refrigerant charge in Circuit A. The circuit will stop to prevent damage to the compressor.

The system has detected a loss of refrigerant charge in Circuit B. The circuit will stop to prevent damage to the compressor.

An alert indicating low suction temperature in Circuit A. The circuit will stop as a precaution.

An alert indicating low suction temperature in Circuit B. The circuit will stop as a precaution.

The saturated suction temperature in Circuit A is too high, potentially during startup. The circuit will stop.

The saturated suction temperature in Circuit B is too high, potentially during startup. The circuit will stop.

An alert indicating high head pressure in Circuit A. The circuit will stop.

An alert indicating high head pressure in Circuit B. The circuit will stop.

The discharge temperature of the digital scroll compressor is too high. Compressor A1 will be shut down to 50% capacity.

The internal real-time clock hardware has failed. The unit will shut down. This may affect scheduling and timing functions.

An error occurred while storing data in the serial EEPROM. This may affect unit operation and configuration.

The input for the 4-20 mA demand limit has failed. Demand limiting functions will be stopped.

The 4-20 mA input for static pressure reset or VFD control has failed. These functions will be stopped.