Climate Talk Fault Code	Transmitted message	Dealer error message	Possible Causes	Corrective Actions	Alarm Status	Unit Type	Consumer error message


01	LOW SIDE FAULT	Low side fault	•Low refrigerant charge. •Restriction in liquid line. •Indoor blower motor failure. •Indoor thermostat set extremely low.	•Verify refrigerant charge; adjust as needed. •Check for restricted liquid line; repair/replace as needed. •Check indoor blower motor; repair/replace as needed. •Check indoor thermostat setting.	minor	2-Stage AC	Pressure error
01	LPS LOCKOUT	Low pressure cut out trip/lockout(3 trips)	•Low refrigerant charge. •Restriction in liquid line. •Indoor blower motor failure. •Indoor thermostat set extremely low.	•Verify refrigerant charge; adjust as needed. •Check for restricted liquid line; repair/replace as needed. •Check indoor blower motor; repair/replace as needed. •Check low pressure switch; repair/replace as needed. •Check indoor thermostat setting.	Critical	2-Stage AC	Pressure error
02	HPS OPEN	High side fault	•Blocked condenser coil. •Outdoor fan not running.	•Check and clean condenser coil. •Check outdoor fan motor; repair/replace as needed. •Check outdoor fan motor wiring; repair/replace as needed. •Check outdoor fan motor capacitor; repair/replace as needed.	minor	2-Stage AC	Pressure error
02	HPS LOCKOUT	High pressure cut out/lockout(3 trips)	•Blocked condenser coil. •Outdoor fan not running.	•Check and clean condenser coil. •Check outdoor fan motor; repair/replace as needed. •Check outdoor fan motor wiring; repair/replace as needed. •Check outdoor fan motor capacitor; repair/replace as needed.	Critical	2-Stage AC	Pressure error
03		Compressor short cycling	•Intermittent thermostat demand. •Faulty compressor relay.	•Check thermostat and thermostat wiring; repair/replace as needed. •Check compressor relay operation; replace as needed.	minor	2-Stage AC	System error
04		Locked rotor	•Compressor bearings are seized. •Failed compressor run capacitor. •Faulty run capacitor wiring. •Low line voltage.	•Check compressor operation; repair/replace as needed. •Check run capacitor; replace as needed. •Check wiring; repair/replace as needed. •Verify line voltage is within range on rating plate; contact local utility if out of range.	Critical	2-Stage AC	System error
05		Open circuit	•Power is disconnected. •Failed compressor protector. •Compressor not properly wired to control.	•Check circuit breaker and fuses. •Check wiring to unit; repair/replace as needed. •Check compressor; repair/replace as needed. •Check compressor wiring; repair/replace as needed.	Critical	2-Stage AC	System error
06		Open start circuit	•Compressor start winding is open. •Failed compressor run capacitor. •Faulty run capacitor wiring. •Compressor not properly wired to control. •Faulty compressor wiring.	•Check compressor; repair/replace as needed. •Check run capacitor; replace as needed. •Check wiring; repair/replace as needed.	minor	2-Stage AC	System error
06		Open start circuit lockout	•Compressor start winding is open. •Failed compressor run capacitor. •Faulty run capacitor wiring. •Compressor not properly wired to control. •Faulty compressor wiring.	•Check compressor; repair/replace as needed. •Check run capacitor; replace as needed. •Check wiring; repair/replace as needed.	Critical	2-Stage AC	System error
07	OPEN RUN LOCK	Open run circuit	•Compressor run winding is open. •Compressor not properly wired to control. •Faulty compressor wiring.	•Check compressor; repair/replace as needed. •Check wiring; repair/replace as needed.	minor	2-Stage AC	System error
07		Open run circuit lockout	•Compressor run winding is open. •Compressor not properly wired to control. •Faulty compressor wiring.	•Check compressor; repair/replace as needed. •Check wiring; repair/replace as needed.	Critical	2-Stage AC
08	HIGH LINE VOLT	Low line voltage	•Low line voltage.	•Check circuit breakers and fuses; Replace if needed. •Verify unit is connected to power supply as specified on rating plate. •Correct low line voltage condition; contact local utility if needed.	minor	2-Stage AC	System error
08	HIGH LINE VOLT	High/No power supply voltage condition	•High line voltage.	•Correct high line voltage condition; contact local utility if needed. •Verify unit is connected to power supply as specified on rating place.	Critical	2-Stage AC	System error
09	LOW SECOND VOLT	Low polit voltage	•Control detects secondary voltage less than 18 VAC. •Transformer overloaded. •Low line voltage.	•Check fuse. •Correct low secondary voltage condition. •Check transformer; replace if needed.	minor	2-Stage AC	System error
A2		Outdoor air temperature sensor fault	•Shorted sensor. •Open sensor. •Sensor disconnected. •Sensor out of range.	•Check sensor connection. •Replace open/shorted sensor.	Critical	2-Stage AC	Sensor error
A3		Outdoor coil temperature sensor fault	•Shorted sensor. •Open sensor. •Sensor disconnected. •Sensor out of range.	•Check sensor connection. •Replace open/shorted sensor.	Critical	2-Stage AC	Sensor error
b0	NO ID AIRFLOW	Blower motor not running	•Indoor blower motor problem. •Communications error between indoor and outdoor unit.	•Check indoor fan motor wiring and connectors; Repair/replace if needed. •Check indoor fan motor; Replace if needed.	Critical	2-Stage AC	Fan Failure error
b9	LOW ID AIRFLOW	Low indoor airflow	•Failed indoor blower motor. •Indoor /outdoor unit mis-match. •Blocked filters. •Restrictive/undersized ductwork.	•Check indoor fan motor wiring and connectors; Repair/replace if needed. •Check indoor fan motor; Replace if needed. •Check ductwork;resize if needed. •Check filters.	minor	2-Stage AC	Fan Failure error
d0[1]	NO NET DATA	Data not yet on network	•Air conditioner/heat pump is wired as part of a communicating system and integrated control module does not contain any shared data.	•Verify system type (communication or legacy). •Replace control board if necessary. •Rewrite shared data using memory card. •Wire system as a legacy system.	Critical	2-Stage AC	System error
d1[2]	INVALID DATA	Invalid data on network	•Air conditioner is wired as part of a communicating system and integrated control module contains invalid shared data or network data is invalid for the integrated control module	•Verify system type (communication or legacy). •Replace control board if necessary. •Rewrite shared data using memory card. •Wire system as a legacy system.	Critical	2-Stage AC	System error
d2[3]	SYSTEM MISMATCH	System Mis-match	•Air conditioner/heat pump is wired as part of a communicating system and outdoor unit requires airflow greater than indoor unit's airflow capability •Shared data is incompatible with the system or missing parameters	•Verify system type (communicating or legacy) •Verify shared data is correct for your specific model; repopulate data if required •Wire system as legacy	Critical	2-Stage AC	System error
d3[4]	INVALID CONFIG	Configuration Mis-match	•Shared data sent to integrated control module does not match hardware configuration	•Verify shared data is correct for your specific model; Repopulate data if required. •Verify system type (communicating or legacy). •Wire system as a legacy system.	Critical	2-Stage AC	Communication error
d4[5]	INVALID MC DATA	Invalid memory card data	•Shared data on memory card has been rejected	•Verify system type (communicating or legacy). •Verify shared data is correct for your specific model; Repopulate data if required. •Verify system type (communicating or legacy). •Wire system as a legacy system.	Critical	2-Stage AC	Communication error
E5		Blown fuse	•Short in low voltage wiring	•Locate and correct short in low voltage wiring.	Critical	2-Stage AC	System error
EE		Compressor relay contacts are welded shut.	•Compressor relay contacts welded	•Replace control	Critical	2-Stage AC	System error

[1]

Roff, Jeff D.:
Control board does not have the necessary data needed to perform its functions

[2]

Roff, Jeff D.:
Control board does not have the appropriate data needed to perform its functions

[3]

Roff, Jeff D.:
the airflow requirement is greater than the airflow capability of the indoor subsystem

[4]

Roff, Jeff D.:
There is a mismatch between the shared data and the control physical hardware

[5]

Roff, Jeff D.:
The memory card data has been rejected