Trane Chiller Troubleshooting and Error codes




Chilled water inlet and outlet openings are covered for shipment. Each compressor has a separate compressor motor starter. The RTAC series features Trane’s exclusive Adaptive Control ™ logic, which monitors the control variables that govern the operation of the chiller unit.

Trane Chiller Troubleshooting and Error codes

398: BAS Communication Lost

390: BAS Failed to Establish

2E6: Check Clock




8A: Chilled Water Flow (Entering)

5EF: Comm Loss: Chilled Water Flow Switch

5F2: Comm Loss: Cond Rfgt

694: Comm Loss: Electronic Expansion Valve, Circuit #1

695: Comm Loss: Electronic Expansion Valve, Circuit #2

5DE: Comm Loss: Emergency Stop




68E: Comm Loss: Evap Oil Return Valve, Cprsr 1A

69E: Comm Loss: Evap Oil Return Valve, Cprsr 1B

68F: Comm Loss: Evap Oil Return Valve, Cprsr 2A

69F: Comm Loss: Evap Oil Return Valve, Cprsr 2B

5E4: Comm Loss: Evaporator Entering Water Temperature

5E3: Comm Loss: Evaporator Leaving Water Temperature

6BB: Comm Loss: Evaporator Rfgt Drain Valve – Ckt 1

6BC: Comm Loss: Evaporator Rfgt Drain Valve – Ckt 2

688: Comm Loss: Evaporator Rfgt Liquid Level, Circuit #1

689: Comm Loss: Evaporator Rfgt Liquid Level, Circuit #2



5F0: Comm Loss: Evaporator Rfgt Pressure, Circuit #1

5F1: Comm Loss: Evaporator Rfgt Pressure, Circuit #2

5F8: Comm Loss: Evaporator Water Pump Control

5DD: Comm Loss: External Auto/ Stop

5E9: Comm Loss: External Chilled Water Setpoint

5DF: Comm Loss: External Circuit Lockout, Circuit #1

5E0: Comm Loss: External Circuit Lockout, Circuit #2

5EA: Comm Loss: External Current Limit Setpoint

680: Comm Loss: Fan Control Circuit #1, Stage #1

681: Comm Loss: Fan Control Circuit #1, Stage #2

682: Comm Loss: Fan Control Circuit #1, Stage #3

683: Comm Loss: Fan Control Circuit #1, Stage #4

684: Comm Loss: Fan Control Circuit #2, Stage #1

685: Comm Loss: Fan Control Circuit #2, Stage #2

686: Comm Loss: Fan Control Circuit #2, Stage #3

687: Comm Loss: Fan Control Circuit #2, Stage #4

68C: Comm Loss: Fan Inverter Fault, Circuit #1 or Circuit #1, Drive 1

68D: Comm Loss: Fan Inverter Fault, Circuit #1, Drive 2

69A: Comm Loss: Fan Inverter Fault, Circuit #2 or Circuit #2

69B: Comm Loss: Fan Inverter Fault, Circuit #2, Drive 2

68A: Comm Loss: Fan Inverter Power, Circuit #1 or Circuit #1 Drive 1 and 2

698: Comm Loss: Fan Inverter Power, Circuit #2 or Circuit #2 or Drive 1 and 2

68B: Comm Loss: Fan Inverter Speed Command, Circuit #1 or Circuit #1 Drive 1 and 2

699: Comm Loss: Fan Inverter or Circuit #2 Drive 1 and 2 Speed Command, Circuit #2

5D9: Comm Loss: Female Step Load Compressor 1A



5DA: Comm Loss: Female Step Load Compressor 1B

5DB: Comm Loss: Female Step Load Compressor 2A

5DC: Comm Loss: Female Step Load Compressor 2B

5EB: Comm Loss: High Pressure Cutout Switch, Cprsr 1A

5EC: Comm Loss: High Pressure Cutout Switch, Cprsr 1B

5ED: Comm Loss: High Pressure Cutout Switch, Cprsr 2A

5EE: Comm Loss: High Pressure Cutout Switch, Cprsr 2B

5E1: Comm Loss: Ice-Machine Control

5FA Comm Loss: Ice-Making Status

5F4 Comm Loss: Intermediate Oil Pressure, Cprsr 1A

5F5 Comm Loss: Intermediate Oil Pressure, Cprsr 1B

5F6 Comm Loss: Intermediate Oil Pressure, Cprsr 2A

5F7 Comm Loss: Intermediate Oil Pressure, Cprsr 2B

69D Comm Loss: Local BAS Interface

5D2 Comm Loss: Male Port Load Compressor 1A

5D4 Comm Loss: Male Port Load Compressor 1B

5D6 Comm Loss: Male Port Load Compressor 2A

5D8 Comm Loss: Male Port Load Compressor 2B

5D1 Comm Loss: Male Port Unload Compressor 1A

5D3 Comm Loss: Male Port Unload Compressor 1B

5D5 Comm Loss: Male Port Unload Compressor 2A

5D7 Comm Loss: Male Port Unload Compressor 2B

5E5 Comm Loss: Oil Temperature, Circuit #1 or Cprsr 1A

5E6 Comm Loss: Oil Temperature, Circuit #2 or Cprsr 2A

696 Comm Loss: Oil Temperature, Cprsr 1B

697 Comm Loss: Oil Temperature, Cprsr 2B

5E2 Comm Loss: Outdoor Air Temperature

690: Comm Loss: Starter 1A

691: Comm Loss: Starter 1B

692: Comm Loss: Starter 2A




693: Comm Loss: Starter 2B

6AC: Comm Loss: Starter Panel High Temperature Limit – Panel 1, Cprsr 1B

6AB: Comm Loss: Starter Panel High Temperature Limit – Panel 1, Cprsr 2A

6AD: Comm Loss: Starter Panel High Temperature Limit – Panel 2, Cprsr 2B

6A0: Comm Loss: Status/ Annunciation Relays

5FB: Comm Loss: Suction Pressure Cprsr 1A

5FC: Comm Loss: Suction Pressure Cprsr 1B

5FD: Comm Loss: Suction Pressure Cprsr 2A

5FE: Comm Loss: Suction Pressure Cprsr 2B

2A1: Condenser Fan Variable Speed Drive Fault – Circuit 1 (Drive 1)

5B4: Condenser Fan Variable Speed Drive Fault – Circuit 1 Drive 2

2A2: Condenser Fan Variable Speed Drive Fault – Circuit 2 (Drive 1)

5B5: Condenser Fan Variable Speed Drive Fault – Circuit 2 (Drive 2)

5B8: Condenser Refrigerant Pressure Transducer – Circuit 1

5B9: Condenser Refrigerant Pressure Transducer – Circuit 2



FD: Emergency Stop

8E: Evaporator Entering Water Temperature Sensor

AB: Evaporator Leaving Water Temperature Sensor

27D: Evaporator Liquid Level Sensor – Circuit 1

3F9: Evaporator Liquid Level Sensor – Circuit 2

6B9: Evaporator Rfgt Drain – Circuit 1

6BA: Evaporator Rfgt Drain – Circuit 2

Trane Chiller Troubleshooting and Error codes

ED: EvaporatorWater Flow Lost

384: Evaporator Water Flow Overdue

5C4: Excessive Loss of Comm

87: External Chilled Water Setpoint

89: External Current Limit Setpoint

1C6: High Differential Refrigerant Pressure – Circuit 1

1C7: High Differential Refrigerant Pressure – Circuit 2

584: High Evaporator Liquid Level – Circuit 1

5B7: High Evaporator Liquid Level – Circuit 2

6B8: High Evaporator Refrigerant Pressure

1DE: High Oil Temperature – Compressor 1A

1E0: High Oil Temperature – Compressor 1B

1DD: High Oil Temperature – Compressor 2A

1DF: High Oil Temperature – Compressor 2B

F5: High Pressure Cutout – Compressor 1A

F6: High Pressure Cutout – Compressor 1B

BE: High Pressure Cutout – Compressor 2A

BF: High Pressure Cutout – Compressor 2B

5BE: Intermediate Oil Pressure Compressor 2A

BF: High Pressure Cutout – Compressor 2B

5BE: Intermediate Oil Pressure Transducer – Compressor 1A

5BF: Intermediate Oil Pressure Transducer – Compressor 1B

5C0: Intermediate Oil Pressure Transducer – Compressor 2A

5C1: Intermediate Oil Pressure Transducer – Compressor 2B

C5: Low Chilled Water Temp: Unit Off

C6: Low Chilled Water Temp: Unit On

1AE: Low Differential Refrigerant Pressure – Circuit 1

1AF: Low Differential Refrigerant Pressure – Circuit 2

583: Low Evaporator Liquid Level – Circuit 1

5B6: Low Evaporator Liquid Level – Circuit 2

194: Low Evaporator Refrigerant Temperature – Circuit 1

195: Low Evaporator Refrigerant Temperature – Circuit 2

6B3: Low Evaporator Temp – Ckt 1: Unit Off




6B3: Low Evaporator Temp – Ckt 2: Unit Off

198: Low Oil Flow – Compressor 1A

199: Low Oil Flow – Compressor 1B

19A: Low Oil Flow – Compressor 2A

19B: Low Oil Flow – Compressor

B5: Low Suction Refrigerant Pressure – Circuit 1

B6: Low Suction Refrigerant Pressure – Circuit 2

B7: Low Suction Refrigerant Pressure – Cprsr 1B

B8: Low Suction Refrigerant Pressure – Cprsr 2B

BA: Motor Current Overload – Compressor 1A

BB: Motor Current Overload – Compressor 1B

BC: Motor Current Overload – Compressor 2A

BD: Motor Current Overload – Compressor 2B

1AD: MP Application Memory CRC Error

6A1: MP Could not Store Starts and Hours

5FF: MP Invalid Configuration

6A2: MP Non-Volatile Block Test Error

69C: MP Non-Volatile Memory Reformat

D9: MP Reset Has Occurred

1E1: Oil Flow Fault – Compressor 1A

1E2: Oil Flow Fault – Compressor 1B

5A0: Oil Flow Fault – Compressor 2A

5A1: Oil Flow Fault – Compressor 2B

1E6: Oil Temperature Sensor – Cprsr 1B

1E8: Oil Temperature Sensor – Cprsr 2B

1E6: Oil Temperature Sensor – Cprsr 1A

1E8: Oil Temperature Sensor – Cprsr 2B

1E6: Oil Temperature Sensor – Cprsr 1A

1E7: Oil Temperature Sensor – Cprsr 2A

A1: Outdoor Air Temperature Sensor



D7: Over Voltage

19C: Phase Loss – Compressor 1A

19D: Phase Loss – Compressor 1B

19E: Phase Loss – Compressor 2A

19F: Phase Loss – Compressor 2B

184: Phase Reversal – Compressor 1A

185: Phase Reversal – Compressor 1B

186: Phase Reversal – Compressor 2A

187: Phase Reversal – Compressor 2B

1A0: Power Loss – Compressor 1A

1A1: Power Loss – Compressor 1B

1A2: Power Loss – Compressor 2A

1A3: Power Loss – Compressor 2B

8C: Pumpdown Terminated – Circuit 1

8D: Pumpdown Terminated – Circuit 2

1B2: Severe Current Imbalance – Compressor 1A

1B3: Severe Current Imbalance – Compressor 1B

1B4: Severe Current Imbalance – Compressor 2A

1B5: Severe Current Imbalance – Compressor 2B

5CD: Starter 1A Comm Loss: MP

6A7: Starter 1A Dry Run Test

5CE: Starter 1B Comm Loss: MP

6A8: Starter 1B Dry Run Test

5CF: Starter 2A Comm Loss: MP

6A9: Starter 2A Dry Run Test

5D0: Starter 2B Comm Loss: MP

6AA: Starter 2B Dry Run Test

CC: Starter Contactor Interrupt Failure – Compressor 2A

CA: Starter Contactor Interrupt Failure – Compressor 1A

CB: Starter Contactor Interrupt Failure – Compressor 1B



CD: Starter Contactor Interrupt Failure – Compressor 2B

180: Starter Did Not Transition – Compressor 1A

181: Starter Did Not Transition – Compressor 1B

182: Starter Did Not Transition – Compressor 2A

183: Starter Did Not Transition – Compressor 2B

6A3: Starter Failed to Arm/Start – Cprsr 1A

6A4: Starter Failed to Arm/Start – Cprsr 1B

6A5: Starter Failed to Arm/Start – Cprsr 2A

6A6: Starter Failed to Arm/Start – Cprsr 2B

1E9: Starter Fault Type I – Compressor 1A

1 EA: Starter Fault Type I – Compressor 1B

1 EB: Starter Fault Type I – Compressor 2A

1EC: Starter Fault Type I – Compressor 2B

1ED: Starter Fault Type II – Compressor 1A

1EE: Starter Fault Type II – Compressor 1B

1EF: Starter Fault Type II – Compressor 2A

1F0: Starter Fault Type II – Compressor 2B

1F1: Starter Fault Type III – Compressor 1A

1F2: Starter Fault Type III – Compressor 1B

1F3: Starter Fault Type III – Compressor 2A

1F4: Starter Fault Type III – Compressor 2B

5C7: Starter Module Memory Error Type 1 – Starter 2A

5C8: Starter Module Memory Error Type 1 – Starter 2B

5C5: Starter Module Memory Error Type 1Starter 1A

5C6: Starter Module Memory Error Type 1-Starter 1B

5C9: Starter Module Memory Error Type 2 – Starter 1A

5CA: Starter Module Memory Error Type 2 – Starter 1B

5CB: Starter Module Memory Error Type 2 – Starter 2A

5CC: Starter Module Memory Error Type 2 – Starter 2B

6B1: Starter Panel High Temperature Limit – Panel 1, Cprsr 1B

6B0: Starter Panel High Temperature Limit – Panel 1, Cprsr 2A

6B2: Starter Panel High Temperature Limit – Panel 2, Cprsr 2B

5BA: Suction Refrigerant Pressure Transducer – Circuit 1, Compressor 1A

5BB: Suction Refrigerant Pressure Transducer – Circuit 1, Compressor 1B

5BC: Suction Refrigerant Pressure Transducer – Circuit 2, Compressor 2A

5BD: Suction Refrigerant Pressure Transducer – Circuit 2, Compressor 2B

5B0: Transition Complete Input Opened – Compressor 1A

5B1: Transition Complete Input Opened – Compressor 1B

5B2: Transition Complete Input Opened – Compressor 2A

5B3: Transition Complete Input Opened – Compressor 2B



5AC: Transition Complete Input Shorted – Compressor 1A

5AD: Transition Complete Input Shorted – Compressor 1B

5AE: Transition Complete Input Shorted – Compressor 2A

5AF: Transition Complete Input Shorted – Compressor 2B

D8: Under Voltage

771: Very Low Evaporator Refrigerant Pressure – Circuit 1

772: Very Low Evaporator Refrigerant Pressure – Circuit 2

Series R Air-Cooled Helical Rotary Liquid Chillers Manual PDF










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