Green Flow Solution logo
Schedule Service

Product troubleshooting

Back to Trane 4TWV0X24A1

Trane 4TWV0X24A1 troubleshooting and error codes

Use this table to identify what the visible code may mean and what information to share when scheduling service. Keep checks simple and visible; do not open electrical, refrigerant, gas, or sealed equipment compartments.

Schedule Service +1 (857) 767-6414

Error-code table

Search codes for 4TWV0X24A1

Code Meaning System area Safe first step Action
Err 18.04 Internal control failure Outdoor variable-speed control Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Err 67.00 Ambient temperature sensor fault Outdoor ambient sensor Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. View details
Err 67.01 Coil temperature sensor fault Outdoor coil sensor Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. View details
Err 67.03 External temperature sensor fault External temperature sensor Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. View details
Err 67.04 Discharge temperature sensor fault in cooling Compressor discharge sensor Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. View details
Err 67.05 Discharge temperature sensor fault in heating Compressor discharge sensor Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. View details
Err 67.06 Suction temperature sensor fault in cooling Suction temperature sensor Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. View details
Err 67.07 Suction temperature sensor fault in heating Suction temperature sensor Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. View details
Err 67.08 Compressor discharge sensor not attached Compressor discharge sensor Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. View details
Alert 68.00 Defrost fault A Defrost operation Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 68.01 Defrost fault B or C Defrost operation Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. View details
Alert 68.02 Combined defrost faults Defrost operation Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 80.00 High pressure short lockout Pressure safety circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Err 80.01 High pressure hard lockout Pressure safety circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 80.02 High pressure reduced-capacity restart Pressure safety circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Err 88.01 Ground fault lockout Drive and grounding circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Err 90.02 Communication busy fault System communication Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Err 91.02 System communication loss System communication Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. View details
Err 91.03 System clock communication loss System communication Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. View details
Alert 106.01 External shutdown switch open External shutdown circuit Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. View details
Alert 114.00 Personality module data error Personality module Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Err 114.03 Personality module missing Personality module Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 114.04 Personality module unit data error Personality module Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Err 114.05 Personality module memory error Personality module Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Err 114.06 Personality module bad or missing Personality module Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Err 155.02 Outdoor EEV motor fault Electronic expansion valve Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 156.01 System low-charge fault Refrigerant circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Err 159.05 Outdoor display communication error Unit bus communication Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. View details
Alert 164.02 Outdoor EEV migrated open Electronic expansion valve Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 164.03 Outdoor EEV migrated closed Electronic expansion valve Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 165.01 Low superheat fault Refrigerant circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 166.01 Low superheat with EEV closed Refrigerant circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 172.01 Display assembly key fault Display assembly Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. View details
Err 174.00 Suction pressure sensor fault Suction pressure transducer Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Err 175.00 Limp-along mode active Variable-speed protection mode Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Err 175.01 Limp-along lockout Variable-speed protection mode Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Err 176.00 Drive communication lockout Compressor drive communication Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 177.00 Drive current derate Compressor drive current Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Err 177.01 Extended drive current derate Compressor drive current Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 177.02 Software current cutout Compressor drive current Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 177.03 Hardware current cutout Compressor drive current Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 177.04 Repeated current lockout Compressor drive current Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 177.05 Outdoor fan current cutout Outdoor fan drive Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 178.00 DC bus overvoltage cutout Drive voltage Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 178.01 DC bus undervoltage cutout Drive voltage Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 178.02 Repeated DC overvoltage lockout Drive voltage Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 179.02 Rectifier temperature lockout Power module temperature Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 179.05 Inverter temperature lockout Power module temperature Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 179.06 Fan power module temperature fault Outdoor fan power module Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 180.02 Low supply voltage cutout Supply voltage Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 180.03 High power cutout Supply voltage and drive load Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 181.00 Gate drive cutout Compressor drive hardware Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 181.02 Compressor phase loss Compressor motor circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 181.04 Locked rotor detection Compressor motor circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 181.07 Repeated gate drive lockout Compressor drive hardware Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 181.08 Drive configuration error Drive configuration Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 181.09 Compressor motor not detected Compressor motor circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 182.00 Compressor startup soft lockout Compressor startup Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 182.01 Compressor startup hard lockout Compressor startup Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 182.02 Compressor failed to reach startup speed Compressor startup Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 183.00 Compressor shutdown fault Compressor shutdown Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 184.00 Indoor coil freeze protection Protection algorithm Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 184.01 High discharge temperature protection at high speed Protection algorithm Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 184.03 Low suction pressure protection in cooling Protection algorithm Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 184.04 Low suction pressure protection in heating Protection algorithm Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 184.08 Universal hard lockout Protection algorithm Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 184.09 Internal lubrication failure Compressor protection Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 184.10 Switchover valve mode mismatch Reversing valve operation Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 187.00 Evacuation mode active Service mode Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. View details
Alert 187.01 Drive diagnostic test active Service mode Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. View details
Alert 188.06 Bad configuration Drive configuration Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 188.11 Outdoor fan communication fault Outdoor fan communication Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 189.01 Board temperature cutout Outdoor control board temperature Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 191.00 Outdoor fan phase loss Outdoor fan motor Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Alert 191.01 Outdoor fan rotation fault Outdoor fan motor Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details

Safety note

What is safe to check before service

These pages are meant to help document the issue, not replace diagnosis. GreenFlow should handle pressure-switch, electrical, refrigerant, lockout, recurring, and warranty-related conditions.

Safe visible checks

  • Thermostat display and settings
  • Filter condition and return-air path
  • Visible outdoor-unit obstruction
  • Photos of the code, unit, and nameplate

Stop and call

  • Repeated lockouts or recurring faults
  • Pressure-switch or sensor faults
  • Electrical odor, unusual noise, or ice buildup
  • Any sealed cabinet, refrigerant, gas, or warranty issue

Brands We Service

Popular cities

Service Areas

Our Happy Customers

Jack B.

Andrey always does a great job.

Jahangir R.

They were very organized to communicate and be on time to come to look at my air condition to fix it.

Terry S.

Excellent service from best tech!

Randy J.

Thanks to Andrey for an amazingly quick response to my request for a service call. He diagnosed and fixed my issue within 24 hours of my asking for help. Excellent service. Thanks.

View All