Thermo King 919180, Manual

Page: 30 / 148

Unit Description
30
Displaying and Clearing Alarm
Codes
When the controller senses an alarm condition, an
Alarm icon appears on the display. A two digit
alarm code is used to identify the type of alarm.
There are three types of alarms.
• Stored Alarms: This alarm indicates that a
condition should be investigated but does not
currently affect unit operation. The Alarm
icon appears for 30 seconds when the
O
N
key
is pressed and then disappears.
• Check Alarms: This alarm indicates that a
condition requires corrective action before an
abnormal condition becomes severe. The
Alarm icon appears and remains On.
• Shutdown Alarms: This alarm indicates that a
condition may damage the unit. The controller
stops the unit, the Alarm icon appears and the
entire display flashes On and Off.
1. To display the alarm code, press and release
the
S
ELECT
key until the alarm screen is
displayed.
NOTE: If more than one alarm has been
sensed, all alarm codes present will
automatically alternate on the screen.
2. Write down each alarm code that appears.
Then correct the cause of each alarm.
NOTE: Press the
O
FF
key to stop unit before
inspecting or servicing the unit. Turn the
Microprocessor On/Off switch to Off to
service the
µ
P-T microprocessor module or
disconnect the unit battery. Finally,
disconnect the battery to completely remove
12 Vdc power to the unit for service of the
microprocessor interface board and unit
controls.
3. To clear the alarms after all problems have
been corrected, start the unit. Then press and
release the
S
ELECT
key until the alarm screen is
displayed again.
4. While the alarm screen is showing, press the
E
NTER
key. The alarm will clear and the
standard display will appear on the screen. If
more than one alarm code is present,
repeatedly press the
E
NTER
key to clear each
alarm code individually.
NOTE: Alarms may continue to appear as
the unit operates if the alarm condition is not
corrected.
Restarting the Unit
These procedures are used when starting units that
have been shut off for short periods of time. When
a unit has been shut off for a long period of time is
first started, it should be started and put through a
full unit self check.
Automatic Start
1. Push the
O
N
key.
2. After a 10 second delay, the unit should
preheat and start automatically.
NOTE: When the CYCLE-SENTRY icon is
active, the unit may not start if:
The compartment temperature is near the
setpoint.
The engine is warm.
The battery is fully charged.
If cooling or heating is required and the engine
temperature is below approximately 120 F (96 C),
but the engine fails to start automatically:
1. Push the
O
FF
key.
2. Check for and correct any alarm conditions
and clear the alarm codes. View the alarms
with the
S
ELECT
key, clear the alarms with the
E
NTER
key, and the repeat the auto start
procedure. see the
µ
P-T Microprocessor
Diagnosis Manual, for detailed information
about alarms.
3. If the engine will still not start, push the
O
FF
key, determine and correct the cause of the
failure.