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Trane TAMXB0C60V51 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.

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Error-code table

Search codes for TAMXB0C60V51

Code Meaning System area Safe first step Action
MCB 2 Flash Active sensor communication error Refrigerant mitigation control board Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
MCB 3 Flash Active refrigerant leak or sensor-failure alarm Refrigerant mitigation control board Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
MCB 4 Flash Past refrigerant detected alarm Refrigerant mitigation control board Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
MCB 5 Flash Past sensor communication error Refrigerant mitigation control board Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
MCB 6 Flash Past sensor error Refrigerant mitigation control board Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
MCB 7 Flash Past sensor communication or sensor error Refrigerant mitigation control board Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
MCB Amber Fast Blink CAN communication lost Refrigerant mitigation control board Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Red 2 Flash Equipment missing, mismatch, or configuration issue Air handler control Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Red 3 Flash Blower issue Blower and airflow Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Red 4 Flash EEV issue Electronic expansion valve Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Red 5 Flash Sensor issue Air handler sensors Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Red 6 Flash Indoor heat issue Electric heat configuration Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Red 7 Flash External switch External switch circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Red 8 Flash Condensate issue Condensate safety Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Red 9 Flash Frost issue Frost protection 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

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Terry S.

Excellent service from best tech!

Jack B.

Andrey always does a great job.

Anna G.

They quickly identified the issue with the heating system and fixed it efficiently. He explained everything clearly and made sure I understood what was going on. Very professional and reliable, extremely satisfied with the service.

Jahangir R.

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

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