Controller Operation 7-25
ALARM CODES FOR ΜP-IV, MULTI-TEMP ΜP-IV, ΜP-V, ΜP-VI, TG-VI , SR-2 AND SR-3
CONTROLLERS
NOTE: The alarms recorded by a controller depend on the controller type, software version, unit model and optional
equipment. See the Alarm code chart on your unit or the appropriate Controller Operation and Diagnosis Manual for more
specific information.
NOTE: If the alarm occurred during a Unit Self-Check, it will be preceded by a dash (-).
00 No Alarms Exist 53 Economizer Valve Circuit
01 Microprocessor Power Up Reset 54 Test Mode Time-Out
02 Evaporator Coil Sensor 55 Check Engine Speeds
03 Control Return Air Sensor 56 Evaporator Fan Low Speed Circuit
04 Control Discharge Air Sensor 57 Evaporator Fan High Speed Circuit
05 Ambient Air Sensor 58 Condenser Fan Low Speed Circuit
06 Coolant Temperature Sensor 59 Condenser Fan High Speed Circuit
07 Engine RPM Sensor 60 Boost Circuit
08 Unit Running on Coil Sensor 61 Low Battery Voltage Check
09 High Evaporator Temperature 62 Ammeter Out of Calibration Range
10 High Discharge Pressure 63 Engine or Vapour Stopped - Reason Unknown
11 Unit Controlling on Alternate Sensor 64 Pretrip Reminder
12 Sensor or Digital Input Shutdown 65 Abnormal Temperature Differential
13 Sensor Check 66 Low Engine Oil Level
14 Defrost Terminated By Time 67 Liquid Line Solenoid
15 Glow Plug Check/Intake Air Heater 68 Internal Controller Fault
16 Manual Start Not Completed 69 Re magnetization Circuit
17 Engine Failed to Crank 70 Hourmeters Failure
18 High Engine Coolant Temperature 71 Maintenance Hourmeter 4 Exceeds Set Time Limit
19 Low Engine Oil Pressure 72 Maintenance Hourmeter 5 Exceeds Set Time Limit
20 Engine (Vapor Motor CR) Failed to Start 73 Maintenance Hourmeter 6 Exceeds Set Time Limit
21 Cooling Cycle Check 74 Controller Reset to Defaults
22 Heating Cycle Check 75 Controller RAM Failure
23 Cooling Cycle Fault 76 Controller EEPROM Failure
24 Heating Cycle Fault 77 Controller EEPROM Checksum Failure
25 Alternator Check 78 Data Log EEPROM Failure
26 Refrigeration Capacity Check 79 Data Log Overflow
27 Vapour Motor RPM High 80 Compressor Temperature Sensor
28 Pre-Trip or Self Check Abort 81 High Compressor Temperature
29 Defrost Damper Circuit 82 High Compressor Temperature Shutdown
30 Defrost Damper Stuck Closed 83 Low Coolant Temperature
31 Oil Pressure Switch 84 Restart Null
32 Refrigeration Capacity Low 85 Forced Unit Operation
33 Check Engine RPM 86 Discharge Pressure Sensor
34 Modulation Circuit 87 Suction Pressure Transducer
35 Run Relay Circuit 88 Reserved for CR
36 Electric Motor Failed to Run 89 Electronic Throttling Valve Circuit
37 Engine Coolant Level 90 Electric Overload
38 Electric Phase Reversed 91 Electric Ready Input
39 Water Valve Circuit 92 Sensor Grades Not Set
40 High Speed Circuit 93 Low Compressor Suction
41 Check Engine Coolant Temperature 94 Loader #1
42 Unit Forced to Low Speed 95 Loader #2
43 Unit Forced to Low Speed Modulation 96 Low Fuel Level
44 Check Fuel System 97 Remote Return Air Sensor (CR)
45 Hot Gas Bypass or Hot Gas Bypass Circuit 98 Fuel Level Sensor
46 Check Air Flow 99 High Compressor Pressure Ratio
47 Remote Sensor Shutdown 100 Heater Fan Failure
48 Check Belts or Clutch 101 Controlling on Evap. Coil Outlet Temp (CR)
49 Check Spare Sensor 1 102 Low Evaporator Coil Temperature (CR)
50 Reset Clock 103 Low Heater Fuel Level
51 Shutdown Circuit 104 Check Remote Fan Speed (Not Currently Used)
52 Heat Circuit 105 Receiver Tank Pressure Solenoid Circuit
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