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Back to Trane 5HCL5036B1

Trane 5HCL5036B1 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 5HCL5036B1

Code Meaning System area Safe first step Action
E1 - protection High pressure protection Pressure safety circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E3 - protection Low pressure protection Pressure safety circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E4 Compressor discharge high-temperature protection Compressor discharge temperature Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
H4 Overload protection Compressor/load protection Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
C6 Compressor discharge temperature sensor error 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
F3 Outdoor ambient temperature sensor error 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
e1 - sensor High pressure sensor error Pressure sensor Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
e3 - sensor Low pressure sensor error Pressure sensor Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
EE Outdoor unit drive memory-chip malfunction Outdoor drive control Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
C4 Outdoor unit jumper-cap malfunction Outdoor control board Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
C3 Outdoor condenser temperature sensor error Outdoor condenser sensor Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. View details
C7 Outdoor unit tube temperature sensor error Outdoor tube sensor Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. View details
H3 Compressor overload protection Compressor/load protection Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E2 Indoor anti-freezing protection Indoor coil protection Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
b2 Overcooler gaseous inlet temperature sensor error Overcooler temperature sensor Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. View details
b3 Overcooler gaseous outlet temperature sensor error Overcooler temperature sensor Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. View details
E6 Indoor and outdoor unit communication malfunction System communication Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
H2 IPM low-temperature protection Compressor drive temperature Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
FE Refrigerant sensor malfunction Refrigerant sensor Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
EH Auxiliary electric heat by mistake Auxiliary electric heat Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
C1 Indoor unit ambient temperature sensor error Indoor ambient sensor Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. View details
C2 Indoor unit evaporator temperature sensor error Indoor evaporator sensor Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. View details
FJ Indoor unit outlet pipe temperature sensor error Indoor outlet pipe sensor Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. View details
CA Indoor discharge temperature sensor error Indoor discharge sensor Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. View details
Cb Indoor unit jumper-cap malfunction Indoor control board Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
CJ Indoor unit mixed air sensor malfunction Indoor mixed air sensor Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. View details
Ab Fan drive-board reset Outdoor fan drive Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
EA Refrigerant leakage protection Refrigerant circuit protection Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
A6 Outdoor fan communication malfunction Outdoor fan communication Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
A8 Outdoor unit module too hot Outdoor drive temperature Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
A9 Outdoor unit drive temperature sensor malfunction Outdoor drive temperature sensor Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. View details
Ad Compressor phase-loss protection Compressor phase protection Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
AH Outdoor unit drive DC bus-voltage high protection Drive voltage Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
AL Outdoor unit drive DC bus-voltage low protection Drive voltage Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
C8 Outdoor driver jumper-cap malfunction Outdoor drive control Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
U2 Compressor phase-sequence protection Compressor phase protection Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
LE Compressor lock-rotor protection Compressor protection Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
P6 Communication malfunction between master control and driver Outdoor drive communication Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
P8 Heat sink, IPM, or PFC over-temperature protection Outdoor drive temperature Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
UL Outdoor fan DC bus-current overcurrent protection Outdoor fan drive Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
PL Compressor DC busbar low-voltage protection Drive voltage Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
PH Compressor DC busbar high-voltage protection Drive voltage Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
PA Compressor AC-current protection Compressor drive current Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
H5 Compressor IPM current protection Compressor drive current Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
L3 Outdoor DC fan malfunction Outdoor fan motor Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
HC PFC over-current protection Power factor correction circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Lc Compressor startup failure Compressor startup Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
P0 Outdoor unit drive reset protection Outdoor drive control Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
P5 Compressor phase overcurrent protection Compressor drive current Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
U1 Compressor current-detection circuit malfunction Compressor current sensing Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
H7 Compressor out-of-step protection Compressor protection Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
P7 Outdoor unit drive temperature sensor-circuit malfunction Outdoor drive temperature sensor Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. View details
PU Capacitor charging malfunction Outdoor drive control Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
A1 Outdoor fan IPM module malfunction Outdoor fan drive Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Ac Outdoor fan startup failure Outdoor fan motor Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
AE Outdoor fan phase-current detection malfunction Outdoor fan current sensing Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
AJ Outdoor fan out-of-step protection Outdoor fan motor Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E0 Indoor fan malfunction Indoor 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

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Ray

Just had a service call because my tankless water heater stopped working with E110 code. Andrey located the root cause real quick and fixed the issue within half an hour, also gave reasonable recommendations for further maintenance.

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.

Jack B.

Andrey always does a great job.

Neal V.

In an industry that often fraught with contractors taking advantage of homeowners, Andrey was honest with his assessment and willing to install a product acquired elsewhere (most want that margin themselves), patiently answered my questions (I’m an engineer so like to understand what’s happening), and proactively offered practical...

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