MP-3000 Controller
126
99 USDA 1 Sensor Open Circuit
(Check Alarm)
• Occurs during pre-trip (PTI) test only.
• Container ID starts with MAE, MSF or MWC.
• Temperature below -50 C (-58 F).
• Indicates:
• All 3 USDA sensors are missing
• Defective cable No. 3
• Check USDA sensors and sensor
connections.
• Check cable No. 3 between controller and
relay board.
112 Zero Current Too High
(Check Alarm)
• Ground (zero current) circuit is 30 milliamps.
• Indicates:
• Defective motor or heater insulation to ground
• Enter Manual Function Test menu and test
(operate) each motor and heater separately.
Note when alarm occurs.
115 Probe Error
(Check Alarm)
• Occurs during pre-trip (PTI) test or probe test failed
in Chilled mode.
• Temperature difference between return air and
evaporator coil sensors is too high (1.5 C [2.7 F]
difference maximum)
•
• Check sensor connections. Check sensor
resistance of each sensor. Resistance must be
2,000 ohms at 25 C (77 F).
116 Probe Error
(Check Alarm)
• Occurs during pre-trip (PTI) test or probe test failed
in Chilled mode.
• Temperature difference between return air and
supply air sensors is too high (0.8 C [1.5 F]
difference maximum)
• Check sensor connections. Check sensor
resistance of each sensor. Resistance must be
2,000 ohms at 25 C (77 F).
117 Probe Error
(Check Alarm)
• Occurs during pre-trip (PTI) test or probe test failed
in Chilled mode.
• Temperature difference between LH supply and RH
supply sensors is too high (0.5 C [1.0 F] difference
maximum)
• Check sensor connections. Check sensor
resistance of each sensor. Resistance must
be 2,000 ohms at 25 C (77 F).
• Check left hand and right hand supply air
sensor locations.
118 High Refrigerant Level (Check Alarm)
• Detects overcharge of refrigerant
• Correct overcharged refrigerant level
Alarm Codes, Descriptions and Corrective Actions (Continued)
Code Description Corrective Action
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