MP-3000 Controller
125
60 Humidity Sensor Error
(Check Alarm)
• Occurs during pre-trip (PTI) test only.
• Relative humidity reading is not between 20% and
95%.
• Indicates:
• Sensor disconnected
• Wrong controller software configuration
• Defective sensor
• Check sensor connections.
• Check controller configuration for correct
humidity setting.
• Replace sensor.
68 AFAM Gas Analyzer Error
(Check Alarm)
• Gas analyzer circuit resistance is too high or too
low.
• Indicates:
• Sensor disconnected
• Wrong controller software configuration
• Short circuit to sensor
• Defective sensor
• Check sensor connections.
• Check controller configuration for correct
AFAM setting.
• Replace sensor.
69 AFAM+ Gas Analyzer Error (Check Alarm)
• Indicates problem with sensor
• Check sensor connections
• Check controller configuration for correct
AFAM setting.
• Replace sensor.
97 Compressor Sensor Open Circuit
(Check Alarm)
• When the sensor circuit resistance is higher than
10,000,000 ohms.
• Temperature is below -30 C (-22 F).
• Indicates:
• Open circuit to sensor
• Defective or wrong sensor
• Defective relay board
• Defective cable No. 1
• Defective controller
• Check sensor resistance between pins 9 and
10 on plug J15. Resistance must be 100,000
ohms at 25 C (77 F).
• Check cable No. 1 between controller and
relay board.
NOTE: Unit will operate normally without
compressor sensor. However, controller
compressor high temperature protection is
not active.
98 Compressor Sensor Short Circuit
(Check Alarm)
• Sensor circuit resistance lower than 200 ohms.
• Temperature above 180 C (356 F).
• Indicates:
• Short circuit to sensor
• Defective or wrong sensor
• Defective relay board
• Defective cable No. 1
• Defective controller
• Check sensor resistance between pins 9 and
10 on plug J15. Resistance must be 100,000
ohms at 25 C (77 F).
• Check cable No. 1 between controller and
relay board.
Alarm Codes, Descriptions and Corrective Actions (Continued)
Code Description Corrective Action
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