CODES

• 00 No Alarms Exist: The unit is operating normally. (Green)
• 01 Microprocessor Power Up Reset: The unit's microprocessor has been reset.
• 02 Check Evaporator Coil Sensor: There's an issue with the evaporator coil sensor. (Yellow)
• 03 Check Return Air Sensor: The return air sensor is experiencing an issue. (Yellow)
• 04 Check Discharge Air Sensor: There's an issue with the discharge air sensor. (Yellow)
• 05 Check Ambient Temp Sensor: The ambient temperature sensor needs to be checked. (Yellow or Green)
• 06 Check Coolant Temp Sensor: The coolant temperature sensor needs to be checked. (Yellow or Green)
• 07 Check Engine RPM Sensor: There's a potential issue with the engine RPM sensor. (Yellow or Green)
• 08 Unit Running on Coil Sensor: The unit is operating using the coil sensor. (Yellow)
• 09 High Evaporator Temperature: The evaporator temperature is too high. (Yellow)
• 10 High Discharge Pressure (or Temp): The discharge pressure or temperature is high. (Red)
• 11 Unit or Zone Controlling on Alternate Sensor: The unit is using an alternate sensor for control. (Yellow)
• 12 Sensor or Digital Input Shutdown: A sensor or digital input caused a shutdown. (Red)
• 13 Sensor Check: A sensor needs checking. (Yellow)
• 14 Defrost Terminate by Time: Defrost cycle ended by time. (Green)
• 15 Check Glow Plugs or Intake Air Heater: Check glow plugs or intake air heater. (Yellow)
• 16 Manual Start Not Completed: Manual start procedure was not completed.
• 17 Engine Failed to Crank: The engine failed to crank. (Yellow)
• 18 High Engine Coolant Temperature: The engine coolant temperature is high. (Yellow)
• 19 Low Engine Oil Pressure: Low engine oil pressure detected. (Red)
• 20 Engine (Vapor Motor CR) Failed to Start: The engine or vapor motor failed to start. (Yellow)
• 21 Cooling Cycle Check: The cooling cycle needs inspection. (Yellow)
• 22 Heating Cycle Fault: A fault in the heating cycle.
• 23 Cooling Cycle Fault: A fault in the cooling cycle. (Red)
• 24 Heating Cycle Fault: A fault in the heating cycle.
• 25 Alternator Check: The alternator needs to be checked. (Yellow)
• 26 Check Refrigeration Capacity: The refrigeration capacity needs to be checked. (Yellow)
• 27 Vapor Motor RPM High (CR): The vapor motor RPM is high (CR). (Red)
• 28 Pretrip or Self Check Abort: The pre-trip or self-check was aborted. (Green)
• 29 Defrost Damper Circuit Check: Check the defrost damper circuit. (Yellow)
• 30 Defrost Damper Stuck Closed: The defrost damper is stuck closed. (Red)
• 31 Check Oil Pressure Switch: The oil pressure switch needs to be checked. (Yellow)
• 32 Refrigeration Capacity Low: The refrigeration capacity is low. (Red)
• 33 Check Engine RPM: Check the engine RPM. (Green)
• 34 Check Modulation Circuit: The modulation circuit needs to be checked. (Yellow)
• 35 Check Run Relay Circuit: The run relay circuit needs to be checked. (Red)
• 36 Electric Motor Failed to Run: The electric motor failed to run. (Red)
• 37 Check Engine Coolant Level: The engine coolant level is low. (Green)
• 38 Electric Phase Reversed: The electric phase is reversed. (Red)
• 39 Check Water Valve Circuit: The water valve circuit needs to be checked. (Yellow)
• 40 Check High Speed Circuit: The high speed circuit needs to be checked. (Yellow)
• 41 Check Engine Coolant Temp: Check the engine coolant temperature.
• 42 Unit Forced to Low Speed: The unit is forced to low speed. (Yellow)
• 43 Unit Forced to Low Speed Modulation: The unit is forced to low speed modulation. (Green)
• 44 Check Fuel System: The fuel system needs to be checked (or Low Battery Voltage). (Red/Yellow)
• 45 Check Hot Gas or Hot Gas Bypass Circuit: The hot gas or hot gas bypass circuit needs to be checked. (Yellow)
• 46 Check Air Flow: Air flow needs to be checked. (Yellow)
• 47 Remote Sensor Shutdown: The unit was shut down by a remote sensor. (Red)
• 48 Check Belts or Clutch: Check the belts or clutch. (Red)
• 49 Check Spare Sensor 1: Spare sensor 1 needs to be checked. (Green)
• 50 Reset Clock: The clock needs to be reset. (Green)
• 51 Check Shutdown Circuit: The shutdown circuit needs to be checked. (Red)
• 52 Check Heat Circuit: The heat circuit needs to be checked. (Yellow)
• 61 Low Battery Voltage: The battery voltage is low. (Yellow)
• 63 Engine Stopped – Reason Unknown: The engine stopped for an unknown reason. (Red)
• 64 Pretrip Reminder: A pre-trip inspection is due. (Green)
• 65 Abnormal Temperature Differential: An abnormal temperature difference is detected. (Yellow)
• 66 Low Engine Oil Level: Low engine oil level detected. (Red)
• 75 Controller RAM Failure: The controller's RAM failed. (Red)
• 76 Controller EPROM Failure: The controller's EPROM failed. (Red)
• 77 Controller EPROM Checksum Failure: The controller's EPROM checksum failed. (Red)
• 78 Data Log EPROM Failure: The data log EPROM failed. (Red)
• 79 Internal Data Logger Overflow: The internal data logger overflowed. (Green)
• 80 Check Compressor Temp Sensor: The compressor temperature sensor needs to be checked. (Green)
• 81 High Compressor Temp: The compressor temperature is high. (Red)
• 82 High Compressor Temp Shutdown: The unit shut down due to high compressor temperature. (Red)
• 83 Low Engine Coolant Temp: The engine coolant temperature is low. (Green)
• 84 Restart Null: Restart null. (Green)
• 85 Forced Unit Operation: The unit is in forced operation. (Green)
• 86 Check Discharge Pressure Sensor: The discharge pressure sensor needs to be checked. (Green)
• 87 Check Suction Pressure Sensor: The suction pressure sensor needs to be checked. (Green)
• 89 Check Electronic Throttling Valve (ETV) Circuit: The electronic throttling valve (ETV) circuit needs to be checked. (Red)
• 90 Electric Overload: There's an electric overload. (Red)
• 101 Controlling on Evap Coil Outlet Temp (CR): The unit is controlling on the evaporator coil outlet temperature (CR). (Red)
• 102 Low Evaporator Coil Temperature (CR): The evaporator coil temperature is low (CR). (Yellow)
• 103 Low Heater Fuel Level (CR): The heater fuel level is low (CR). (Yellow)
• 104 Check Remote Fan Speed: The remote fan speed needs to be checked. (Yellow)