Alarms
The Alarm Menu allows the operator to view any active alarms, and allows most alarms to be cleared.
Log Alarm
Log Alarms are indicated for 30 seconds each time the unit is turned on. This level of alarm serves as a notice to take corrective action before a problem becomes severe. Maintenance items such as maintenance hourmeter time-outs are Log Alarms. The TemperatureWatch™ screen is not disabled if only Log Alarm(s) are active.
When the unit is turned on, the display will show the Thermo King
Logo and then the Configuring System
message. If Log Alarm(s)
are present, the Log Alarm notice will appear on the display for 30
seconds. The remote indicator alarm light (if installed) will also
be on during this period. After 30 seconds, the Standard Display will
appear and the remote indicator alarm light will go off.
Check Alarm
Check Alarms are indicated by a steady alarm indication at the
top of the display and the message Service Required within 24 Hours
. The Alarm Icon will appear. This level of alarm serves as a notice
to take corrective action before a problem becomes severe. The unit
will run with Check Alarms but some features and functions may be
inhibited. The TemperatureWatch screen is disabled if a Check Alarm
is active.
If a Check Alarm condition occurs while the unit is running, the alarm icon will appear in the display as shown ( Alarm Icon).
Prevent Alarm
Prevent Alarms are indicated by a steady alarm indication at the top of the display and the message “Service Required within 24 Hours”. The Alarm Icon will appear. The unit will be temporarily shut down if a Prevent Alarm is active. The unit will remain shut down for a timed restart interval or until the fault conditions are corrected and then restart. If the unit is in a temporary shutdown, Alarm Code 84 Restart Null will be present along with the associated Prevent Alarm. In most cases, the unit will restart with reduced performance to determine if continued operation is possible. If the alarm does not reoccur with reduced performance, the unit will return to full performance. If the unit is operating with reduced performance, Alarm Code 85 Forced Unit Operation will also be present under some conditions. In general, if the alarm condition reoccurs a defined number of times, the alarm is set as a Shutdown Alarm and no further restarts are possible. The Temperature Watch screen is disabled if a prevent alarm is active.
Shutdown Alarm
If a Shutdown Alarm occurs while the unit is running, it will be indicated by all of the following ( Reverse/Normal Video):
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The Alarm Icon will appear.
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The display, backlight and optional remote alarm light will flash on and off.
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The display will switch from normal to inverted and back (light areas become dark and dark areas become light.)
Shutdown Alarms will force the unit into shutdown. The unit will remain in shutdown until the Shutdown Alarm is manually cleared. Exceptions are some engine and electric Shutdown Alarms that become Log Alarms when switched to the alternate operating mode (diesel to electric or electric to diesel). The TemperatureWatch screen is disabled if a unit level Shutdown Alarm is active.
Pretrip Alarm
If an alarm occurs during a Pretrip Test, the alarm code will be displayed as Pretrip Alarm XX, where XX is the alarm code.
Alarm Codes When Switching Between Diesel and Electric
If a shutdown alarm occurs that affects only diesel mode operation and the unit is switched to electric, the diesel mode shutdown alarm becomes an electric mode log alarm. This allows the unit to run in electric mode without clearing the shutdown alarm that is preventing diesel mode operation. If the unit is switched back to diesel mode, the alarm again become a diesel mode shutdown alarm and prevents unit operation.
In the same manner, if a shutdown alarm occurs that affects only electric mode operation and the unit is switched to diesel, the electric mode shutdown alarm becomes a diesel mode log alarm to allow diesel mode operation. If the unit is switched back to electric mode, the alarm reverts to an electric mode shutdown alarm and prevents unit operation. If the unit is configured for electric to diesel Auto-Switch, it automatically starts and runs in diesel mode if an electric shutdown occurs.
Clearing Alarm Codes
Most alarm codes can be cleared conventionally from the Alarm Menu using the CLEAR Key.
The following control and display sensor alarm codes can only be cleared from the Maintenance Menu or Guarded Access Menu:
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Alarm Code 03 Check Control Return Air Sensor
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Alarm Code 04 Check Control Discharge Air Sensor
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Alarm Code 203 Check Display Return Air Sensor
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Alarm Code 204 Check Display Discharge Air Sensor
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Alarm Code 74 Controller Reset to Defaults.
The following alarm codes clear automatically:
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Alarm Code 64 Pretrip Reminder - Clears when a Pretrip Test is performed.
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Alarm Code 84 Restart Null - Clears when the unit is no longer in a restart null due to a Prevent Alarm.
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Alarm Code 85 Forced Unit Operation - Clears when the unit is no longer running in a forced mode due to a Prevent Alarm.
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Alarm Code 91 Check Electric Ready Input - Clears automatically when electric power is restored.
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Alarm Code 92 Sensor Grades Not Set - Clears when the sensor grade is changed from 5H.
If the Limited Alarm Restarts feature is enabled, the following additional alarm codes may only be cleared from the Guarded Access Menu. If this is the case, the CLEAR soft key will not appear if the alarms are displayed from the Main Menu or the Maintenance Menu.
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Alarm Code 10 High Discharge Pressure
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Alarm Code 23 Cooling Cycle Fault
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Alarm Code 24 Heating Cycle Fault
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Alarm Code 32 Refrigeration Capacity Low
Displaying and Clearing Alarm Codes
Alarms are displayed and cleared using the Alarm Menu. From the Standard Display, press the MENU Key ( Menu Key).
The Main Menu will appear. Press the UP or DOWN Key as required to choose the Alarms Menu ( Up/Down, Select Keys). When the Alarms Menu is shown, press the SELECT Key to select the Alarms Menu.
The number of alarms (if more than one) and a list of the alarms with the most recent alarm first will be shown. In the example shown ( Alarms Menu), there are two alarms. The most recent is Alarm Code 5 Check Ambient Temp Sensor.
If necessary to view all alarms, scroll down using the DOWN Key ( Down Key).
If the alarm situation has been resolved, press the CLEAR Key to clear the alarm ( Clear Key).
The display will briefly show CLEARING ALARM 5 – PLEASE WAIT and the Alarm Menu will reappear ( Pretrip Reminder).
Alarm Code 64 Pretrip Reminder cannot be cleared using the CLEAR Key. This alarm will clear automatically when a Pretrip Test is run.
If a serious condition occurs, the unit will be shut down to prevent damage to the unit or the load. If this occurs, the Alarm Icon will appear, the display and backlight will flash on and off ( Unit Shutdown).
The Alarm Menu display will display the Shutdown Alarm Code. For additional information regarding the alarm shown on the display, press the HELP Key ( Help Key).
A help message will appear. Press the EXIT Key to return to the Alarms Menu ( Exit Key). Check the oil level and add oil as required, clear the alarm and restart the engine.
To return to the Main Menu press the EXIT Key. To return to the Standard display press the EXIT Key again.
Important Alarm Notes
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If an alarm will not clear, it may still exist. If the alarm is not corrected, it will not clear or may be immediately set again.
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If an alarm cannot be cleared from the Main menu, the Clear Key will not appear. These alarms must be cleared from the Maintenance or Guarded Access Menus.
See Displaying and Clearing Alarm Codes () for an overview or the procedure.