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Carrier 48/50Z HVAC Rooftop PIC Alarm List

Carrier 48/50Z HVAC Rooftop PIC Alarm List Error Codes

Complete alarm and error code reference for the Carrier 48/50Z HVAC Rooftop PIC Alarm List. Browse all 76 documented fault codes below, each linking to a detailed troubleshooting guide.

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Complete Alarm List

COMPRESSOR A1 FAULT

COMPRESSOR A2 FAULT (Sizes 090,105 Only)

COMPRESSOR A1 STATUS

COMPRESSOR B1 FAULT

COMPRESSOR B2 FAULT (Sizes 090,105 Only)

COMPRESSOR B1 STATUS

THERMISTOR FAILURE SUPPLY AIR

THERMISTOR FAILURE RETURN AIR

OUTSIDE AIR THERMISTOR FAILURE

CIRCUIT A CONDENSER THERMISTOR FAILURE

CIRCUIT B CONDENSER THERMISTOR FAILURE

COMPRESSOR A1 THERMISTOR FAILURE

COMPRESSOR B1 THERMISTOR FAILURE

SPACE THERMISTOR FAILURE

CIRCUIT A DISCHARGE TRANSDUCER FAILURE

CIRCUIT B DISCHARGE TRANSDUCER FAILURE

CIRCUIT A SUCTION TRANSDUCER FAILURE

CIRCUIT B SUCTION TRANSDUCER FAILURE

LOSS OF COMMUNICATION WITH DSIO1

LOSS OF COMMUNICATION WITH DSIO2

LOSS OF COMMUNICATION WITH OPTION BOARD 1 (PSIO2)

LOW PRESSURE CIRCUIT A

LOW PRESSURE CIRCUIT B

HIGH PRESSURE CIRCUIT A

HIGH PRESSURE CIRCUIT B

SUPPLY FAN FAILURE

LOW CIRCUIT A SATURATED SUCTION TEMP

LOW CIRCUIT B SATURATED SUCTION TEMP

HIGH CIRCUIT A SUCTION SUPERHEAT

HIGH CIRCUIT B SUCTION SUPERHEAT

LOW CIRCUIT A SUCTION SUPERHEAT

LOW CIRCUIT B SUCTION SUPERHEAT

ILLEGAL CONFIGURATION (Sizes 030-075 Only)

HYDRONIC COIL FREEZE STAT

LINKAGE FAILURE

BUILDING PRESSURE

DUCT STATIC PRESSURE

IAQ SET POINT MISCONFIGURED

SUPPLY AIR TEMP LOW LIMIT

SUPPLY AIR TEMP HIGH LIMIT

RETURN AIR TEMP LOW LIMIT

RETURN AIR TEMP HIGH LIMIT

OUTSIDE AIR TEMP LOW LIMIT

OUTSIDE AIR TEMP HIGH LIMIT

SPACE TEMP LOW LIMIT

SPACE TEMP HIGH LIMIT

STATIC PRESSURE LOW LIMIT

STATIC PRESSURE HIGH LIMIT

RELATIVE HUMIDITY LOW LIMIT

RELATIVE HUMIDITY HIGH LIMIT

OUTSIDE AIR RELATIVE HUMIDITY LOW LIMIT

OUTSIDE AIR RELATIVE HUMIDITY HIGH LIMIT

BUILDING PRESSURE LOW LIMIT

BUILDING PRESSURE HIGH LIMIT

OUTSIDE AIR CFM LOW LIMIT

OUTSIDE AIR CFM HIGH LIMIT

INDOOR AIR QUALITY LOW LIMIT

INDOOR AIR QUALITY HIGH LIMIT

RUN HOURS EXCEED SERVICE/MAINT LIMIT

Unit down / Critical Serial EEPROM Failure Error

Real Time Clock Hardware Failure

Serial EEPROM Hardware Failure

Serial EEPROM Failure Error

A/D Hardware Failure

Supply Air Temperature-All Thermistors have failed

Supply Air Temperature Thermistor 1 Failure

Supply Air Temperature Thermistor 2 Failure

Supply Air Temperature Thermistor 3 Failure

Cooling Setpoint Ratio Input Error

Heating Setpoint Ratio Input Error

Limit Switch Thermistor Failure