Thermo King 098203, Maintenance Manual

Page: 243 / 264

Diagnosis: Troubleshooting, Warnings and Alarm Codes
241
44 Return Air temperature Too Low
• Occurs during Normal Run only.
• Only active with the surveillance active (OOCL
option)
• During dehumidify operation or if ambient air
temperature is below set point:
• If return air temperature is below set point -3C.
• Else (other operation range):
• If return air temperature is below set point -1C.
• The alarm state has to be present for 15minutes
before the alarm is set.
• Indicates:
• Container/side panels defective, damaged or
leaking.
• Using DATA menu to evaluate sensors.
• Use PROBE TEST to help determine the
problem.
• Replace sensor.
51 Power Line Voltage Too Low
• Shutdown Alarm
• Occurs if line voltage has been below 330VAC and
is below 340 volts for 30 minutes.
• During the 30 minutes and until voltage gets back
above 340VAC the compressor is stopped, for
protecting the unit.
• Indicates:
• Poor power supply.
• Using DATA menu to evaluate the power line
quality.
• Refer to the electrical specifications in the
Specifications Section for correct power
requirements.
52 Probe Error
• Occurs during pretrip (PTI) test or probe test in
Chilled mode.
• Temperature difference between supply and return
air is above 1,5C and the system is not capable of
pinpointing which probe is failing.
• Temperature difference between supply and return
air and evaporator coil is above 1,5C and the
system is not capable of pinpointing which probe is
failing.
• Indicates:
• Sensor error.
• Sensor misplacement.
• Using MANUAL FUNCTION TEST, ventilate
with evaporator fan high speed and evaluate
the readings.
• Check sensor connections.
• Replace sensor.
• Check sensor.
Alarm Codes, Descriptions and Corrective Actions (Continued)
Code Description Corrective Action