Thermo King 098203, Maintenance Manual

Page: 252 / 264

Diagnosis: Troubleshooting, Warnings and Alarm Codes
250
128 Supply Air Temperature Probe Error
• Occurs during pretrip (PTI) test and probe test only.
• After ventilation with the evaporator fans.
• If the supply and return air temperature sensor
differs more than 1,5C and the return air
temperature is within 1,5C of evaporator coil
temperature.
• If evaporator coil temperature sensor is failing, if the
supply and return air temperature sensors differs
more than 1,5C. Both alarm 129 and 128 will be set.
• Indicates:
• Failing sensors.
• Misplaced sensors.
• Failing controller.
• Use the DATA menu to detect the failing
sensor.
• Replace sensors.
• Use the tester to determine the problem.
129 Return Air Temperature Probe Error
• Occurs during pretrip (PTI) test and probe test only.
• After ventilation with the evaporator fans.
• If the supply and return air temperature sensor
differs more than 1,5C and the supply air
temperature is within 1,5C of evaporator coil
temperature.
• If evaporator coil temperature sensor is failing, if the
supply and return air temperature sensors differs
more than 1,5C. Both alarm 129 and 128 will be set.
• Indicates:
• Failing sensors.
• Misplaced sensors.
• Failing controller.
• Use the DATA menu to detect the failing
sensor.
• Replace sensors.
• Use the tester to determine the problem.
130 Evaporator Coil Temperature Probe Error
• Occurs during pretrip (PTI) test and probe test only.
• After ventilation with the evaporator fans.
• If the evaporator coil temperature differs more than
1,5C from the mean value of supply and return air
temperature.
• Indicates:
• Failing sensors.
• Misplaced sensors.
• Failing controller.
• Use the DATA menu to detect the failing
sensor.
• Replace sensors.
• Use the tester to determine the problem.
Alarm Codes, Descriptions and Corrective Actions (Continued)
Code Description Corrective Action