Thermo King 098916, Maintenance Manual

Page: 163 / 196

Diagnosis: Troubleshooting, Status Messages, Alarm Codes
162
Status Messages and
Controller Actions
The controller displays status messages (In the
Miscellaneous Function Menu under Status) on
the LCD display for several general faults. More
than one status message may appear at a time.
Press the
F2
or
F3
key to scroll through message
displays.
Status Messages and Controller Actions
Message
No.
Status Message Controller Action
1
Power Error, Check 20A Fuses
Indicates:
• One or more phases are missing
• Compressor is able to draw amps on all
phases while heater lacks amps on one or
more phases.
• Controller activates Alarm 18
• Controller will try to restart unit after 60 minutes.
2
High Pressure Cutout, Check Water Cooling
Indicates:
• Unit stops due to high pressure cutout and
water pressure switch is open.
• Controller clears message on compressor
start-up.
• No alarm is set until Controller determines that
unit current draw is too low (Alarm Code 37) or
supply air temperature is too high (Alarm Code
41).
3
Probe Test, Please Wait
Indicates:
• Incorrect temperature difference between
Supply-LH, Supply-RH, or Return Air Sensor
for 10 minutes with evaporator fan amps OK.
• Controller automatically activates probe test to
check for a defective sensor. Message clears
when test is complete.
• Controller displays new message if test indicates
a sensor is defective.
4
Supply–Right Hand Problem, Sensor
Disabled
Indicates:
• Controller disables sensor due to open or
short circuit or sensor failed a Probe Test.
• Controller activates Alarm Code 52
• Controller activates Alarm Code 00 or 01,
depending on type of sensor failure.
• Controller clears message during Defrost mode
and when Unit On/Off switch is turned Off.
• Controller uses left hand supply sensor to control
unit if right hand sensor is defective.
• Controller uses return sensor plus an offset to
control unit if both supply sensors are defective.
5
Supply–Left Hand Problem, Sensor Disabled
Indicates:
• Controller disables sensor due to open or
short circuit or sensor failed a Probe Test.
• Controller activates Alarm Code 52
• Controller activates Alarm Code 00 or 01,
depending on type of sensor failure.
• Controller clears message during Defrost mode
and when Unit On/Off switch is turned Off.
• Controller uses right hand supply sensor to
control unit if left hand sensor is defective.
• Controller uses return sensor plus an offset to
control unit if both supply sensors are defective.
7
High Pressure Cutout, Check Condenser
Probe
Indicates:
• Units stops due to high pressure cutout, water
pressure switch is closed and condenser
temperature is low.
• Controller clears message on compressor
start-up.
• No alarm is set until Controller determines that
unit current draw is too low (Alarm Code 37) or
supply air temperature is too high (Alarm Code
41).