Table 8 — ComfortLinkAlarm Codes

 

 

 

 

 

ALARM

 

 

 

 

OR

DESCRIPTION

ACTION TAKEN BY

RESET

PROBABLE CAUSE

ALERT

CONTROL

METHOD

 

 

NUMBER

 

 

 

 

 

Digital Compressor Control Board Alarm

No action

Automatic

See the DSC’s LEDs for troubleshooting

 

Compressor A1 Safety Trip

Add Strike for Circuit A

Automatic

Current Sensing turned on (CS.A1 = Enable) and

 

should be off

 

 

 

 

 

Service Test --- Compressor A1 Safety Trip

Add Strike for Circuit A

Automatic

Current Sensing turned on (CS.A1 = Enable) and

T051

should be off

 

 

 

 

Compressor A1 Current Detected After

Turn off all

Automatic

Current Sensing turned on (CS.A1 = Enable) and

 

Turnoff

compressors

should be off

 

 

 

Service Test --- Compressor A1 Current

Turn off all

Automatic

Current Sensing turned on (CS.A1 = Enable) and

 

Detected After Turnoff

compressors

should be off

 

 

T064

Circuit A Saturated Condensing Temp

Use OAT to control

Automatic

Faulty, shorted, or open thermistor caused by wiring

Thermistor Failure

Outdoor fans

error or loose connection.

 

 

T066

Circuit A Saturated Suction Temperature

No Cooling

Automatic

Suction transducers internally forced inactive

Thermistor Failure

 

 

 

 

T073

Outdoor Air Temperature Thermistor Failure

No cooling with

Automatic

Faulty, shorted, or open thermistor caused by wiring

economizer

error or loose connection.

 

 

 

T074

Space Temperature Thermistor Failure

No heating or cooling

Automatic

Faulty, shorted, or open thermistor caused by wiring

error or loose connection.

 

 

 

 

T075

Supply Air Temperature Thermistor Failure

No cooling mode

Automatic

Faulty, shorted, or open thermistor caused by wiring

error or loose connection.

 

 

 

 

T076

Return Air Thermistor Failure

No differential DB

Automatic

Faulty, shorted, or open thermistor caused by wiring

crossover

error or loose connection.

 

 

 

T077

Space Relative Humidity Sensor Failure

If RH.S = Yes, then no

Automatic

Faulty, shorted, or open sensor caused by wiring

indoor humidity control

error or loose connection.

 

 

 

T092

Circuit A Suction Pressure Transducer

Shutdown Circuit A

Manual

Faulty transducer, faulty 5---V power supply, or loose

Failure

connection

 

 

 

T102

 

If CS.A1 = Enable,

 

Current Sensing turned on (CS.A1 = Enable) and

Compressor A1 Current Sensor Failure

then no T051 current

Automatic

should be off

 

 

alarm

 

 

 

 

 

T110

Circuit A Loss of Charge

Shutdown Circuit A

Manual

Low refrigerant or faulty suction pressure transducer

Service Test --- Circuit A Loss of Charge

Shutdown Circuit A

Manual

Low refrigerant or faulty suction pressure transducer

 

 

 

 

 

An overcharged system, high outdoor ambient

 

Circuit A High Discharge Pressure

Shutdown Circuit A

Automatic

temperature coupled with dirty outdoor coil, plugged

T126

 

 

 

filter drier, or a faulty high---pressure switch.

Service Test --- Circuit A High Discharge

 

 

An overcharged system, high outdoor ambient

 

 

 

 

Shutdown Circuit A

Automatic

temperature coupled with dirty outdoor coil, plugged

 

Pressure

 

 

 

filter drier, or a faulty high---pressure switch.

 

 

 

 

 

 

 

 

Low refrigerant charge, dirty filters, evaporator fan

 

 

 

 

turning backwards, loose or broken fan belt, plugged

 

Circuit A Low Refrigerant Pressure

Add Strike for Circuit A

Automatic

filter drier, faulty transducer, excessively cold return

 

 

 

 

air, or stuck open economizer when the ambient

T133

 

 

 

temperature is low.

 

 

 

Low refrigerant charge, dirty filters, evaporator fan

 

 

 

 

 

Service Test --- Circuit A Low Refrigerant

 

 

turning backwards, loose or broken fan belt, plugged

 

Add Strike for Circuit A

Automatic

filter drier, faulty transducer, excessively cold return

 

Pressure

 

 

 

air, or stuck open economizer when the ambient

 

 

 

 

 

 

 

 

temperature is low.

T143

Circuit A Failure To Pressurize

Add Strike for Circuit A

Automatic

Wiring causing reverse rotation or faulty compressor

Service Test --- Circuit A Failure To

Add Strike for Circuit A

Automatic

Wiring causing reverse rotation or faulty compressor

 

Pressurize

 

 

 

 

T153

Real Timeclock Hardware Failure

No time and date

Automatic

No time/date configured, software failure, or MBB

schedule operation

failure

 

 

 

A154

Serial EEPROM Hardware Failure

Unit Shutdown

Automatic

Software failure or MBB failure

T155

Serial EEPROM Storage Failure Error

Unit operation errors

Automatic

Software failure or MBB failure

A156

Critical Serial EEPROM Storage Fail Error

Unit Shutdown

Automatic

Software failure or MBB failure

A157

A/D Hardware Failure

Unit Shutdown

Automatic

Software failure or MBB failure

 

Circuit A Down Due to Failure

Shutdown Circuit A

Manual

Circuit has 3 strikes or has been locked out by

A163

another alarm

 

 

 

Service Test --- Circuit A Down Due to

Shutdown Circuit A

Manual

Circuit has 1 strike or has been locked out by another

 

 

Failure

alarm

 

 

 

* See Legend on next page

48/50PD

29

Page 29
Image 29
Carrier 48/50PD05 manual ComfortLink Alarm Codes

48/50PD05 specifications

The Carrier 48/50PD05 is a remarkable addition to Carrier's lineup of rooftop units, offering advanced cooling and heating solutions for commercial applications. Designed for medium-sized buildings, this unit is well-suited for both new installations and as a replacement for older systems, thanks to its versatile features and efficient performance.

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Overall, the Carrier 48/50PD05 stands out as a high-performance HVAC solution that combines efficiency, technology, and durability. It provides building owners with a versatile tool to ensure comfort while minimizing their environmental footprint. With a strong emphasis on energy savings and advanced control features, this rooftop unit is a smart investment for any commercial property.