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Back to Trane 5TWR7048A1

Trane 5TWR7048A1 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 5TWR7048A1

Code Meaning System area Safe first step Action
A1000AA 1 Starting MOC fault Outdoor drive control Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
A1000AA 2 Low speed MOC communication fault Outdoor drive communication Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
A1000AA 3 Compressor internal protection Compressor protection Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
A1000AA 4 Compressor overcurrent protection Compressor drive current Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
A1000AA 5 Outdoor fan overcurrent protection Outdoor fan drive Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
A1000AA 6 High preheat IPM temperature protection Drive temperature Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
A1000AA 7 High coil temperature protection Outdoor coil temperature Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
A1000AA 8 High discharge temperature protection Compressor discharge temperature Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
A1000AA 9 High MOC compressor IPM temperature Compressor drive temperature Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
A1000AA A Outdoor 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
A1000AA b AOC jumper pin engaged Outdoor control board Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
A1000AA C 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
A1000AA d Discharge temperature sensor fault 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
A1000AA E Software error or high MOC PFC temperature protection Outdoor drive control Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
A1000AA F High MOC fan IPM temperature protection Outdoor fan drive temperature Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
A1000AA H Hard lock Outdoor control lockout Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
A1000AA P Pressure protection Pressure safety circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E0 Personality module error Outdoor personality module Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E1 Configuration error Outdoor configuration Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E2 AOC application error Outdoor application control Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
F0 AOC-MOC communication fault Outdoor drive communication Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
F1 Compressor startup fault Compressor startup Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
F2 Compressor overcurrent Compressor drive current Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
F3 Compressor control fault Compressor drive control Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
F4 Fan control fault Outdoor fan drive Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
F5 AC overcurrent fault Outdoor drive current Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
F6 MOC high temperature fault Outdoor drive temperature Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
F7 AC input voltage fault Outdoor power input Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
F8 DC output voltage fault Outdoor drive voltage Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
F9 MOC internal fault Outdoor motor control Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
FA 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
FC 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
Fd Discharge temperature sensor fault 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
Fr 24 Vac control R-signal fault Low-voltage control Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
dC Compressor overcurrent de-rate Compressor drive current Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
dF Outdoor fan overcurrent de-rate Outdoor fan drive Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
d5 MOC AC input overcurrent de-rate Outdoor drive current Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
d6 High MOC IPM temperature de-rate Outdoor drive temperature Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
d7 High MOC PFC temperature de-rate Outdoor drive temperature Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
d8 High coil temperature de-rate Outdoor coil temperature Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
dd High discharge temperature de-rate Compressor discharge temperature Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
LC Compressor overcurrent lockout Compressor drive current Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
LF Outdoor fan overcurrent lockout Outdoor fan drive Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
L5 MOC AC input overcurrent lockout Outdoor drive current Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
L6 High MOC IPM temperature lockout Outdoor drive temperature Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
L7 High MOC PFC temperature lockout Outdoor drive temperature Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
L8 High coil temperature lockout Outdoor coil temperature Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Ld High discharge temperature lockout Compressor discharge temperature Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
LL Low-pressure lockout Pressure safety circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
LH High-pressure or DTC lockout Pressure safety circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
HC Compressor overcurrent hard-lock Compressor drive current Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
HF Outdoor fan overcurrent hard-lock Outdoor fan drive Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
H5 MOC AC input overcurrent hard-lock Outdoor drive current Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
H6 High MOC IPM temperature hard-lock Outdoor drive temperature Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
H7 High MOC PFC temperature hard-lock Outdoor drive temperature Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
H8 High coil temperature hard-lock Outdoor coil temperature Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Hd High discharge temperature hard-lock Compressor discharge temperature Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
HL Low-pressure hard-lock Pressure safety circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
HH High-pressure hard-lock Pressure safety circuit 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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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.

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Andrey was professional, prompt, smart, thorough and exceedingly pleasant. We are likely switching our current HVAC company to Green Flow.

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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.

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Green Flow and the people who work there are terrific. Vlad and Andre are excellent. Andre was very helpful. He was punctual, respectful, efficient and knowledgeable. He did not try to sell me something I didn’t need ( as others have done before). I was charged $99 which...

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