Alarms

Alarms may be one of four types as shown.

Parent topic: Truck Premium Display HMI Control Panel

Log Alarms

Log Alarms are indicated for 60 seconds each time the unit is turned on. This level of alarm serves as a notice to take corrective action before the condition impacts unit performance. Maintenance items such as maintenance hourmeter time-outs are Log Alarms.

When the unit is turned on, the display will show the Thermo King Logo and the "Configuring System" message. If Log Alarm(s) are present, the Log Alarm notice will appear on the display for 60 seconds as shown ( Log Alarm Notice). The amber K symbol of the remote indicator alarm light (if installed) will also be on during this period. The Standard Display will appear and the remote indicator alarm light will go to the white T symbol after 60 seconds.

Note The Alarm Icon does not appear on startup with log alarms present.

Log Alarm Notice

Note If required, an engine start may occur while the Log Alarm Notice is shown ( Log Alarm Notice). This is normal operation.

Check Alarms

Check Alarms are indicated by an Alarm Icon in the display. The amber K symbol of the remote indicator alarm light (if installed) will be on. 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.

Shutdown Alarms

Shutdown Alarms will be set if continued operation could cause damage to the unit or the load. Shutdown Alarms are indicated by the following:

  • The Alarm Icon will appear in the display.

  • The display and backlight will flash on and off.

  • The display will switch from normal to inverted and back to normal (light areas become dark and dark areas become light).

  • The remote indicator alarm light (if installed) will display only a row of LEDs at the bottom.

Shutdown Alarm

Shutdown Alarms will force the unit into shutdown to prevent potential damage to the unit or load. 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).

Prevent Alarms

Prevent Alarms are also indicated by a steady Alarm Icon in the display. The remote indicator alarm light (if installed) will be on. The unit will attempt to resolve the situation as shown below:

  • 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.

  • If the unit is in a temporary shutdown, Alarm Code 84 Restart Null will be present along with the associated Prevent Alarm.

  • The unit will restart and run (in most cases with forced reduced performance) to determine if continued operation is possible. The unit will run in this manner for a timed interval. If the unit is running with forced reduced performance, Alarm Code 85 Forced Unit Operation will also be present under some conditions.

  • If the alarm does not re-occur during the timed running interval with reduced performance, the unit will return to full performance to determine if continued operation is possible. The unit will run in this manner for a timed interval. If the unit is successfully able to return to full performance for the timed interval without the alarm re-occurring, the alarm is auto cleared and the unit will run normally.

  • All Prevent Alarm events and conditions are logged by the ServiceWatch Data Logger.

  • In general, if the alarm condition re-occurs a defined number of times, the alarm is set as a Shutdown Alarm and no further restarts are possible.

Note If the Restart After Shutdown feature in the Guarded Access Menu is set for CONTINUOUS, an unlimited number of restart attempts are allowed.

Pretrip Alarm Codes

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 autoswitch, it automatically starts and runs in diesel mode if an electric shutdown occurs.

Alarm Code Notification

The Alarm Icon used in previous Thermo King controllers has been incorporated. If a Check Alarm condition occurs, the Alarm Icon will appear in the display as shown ( Alarm Icon).

Alarm Icon

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:

  • Alarm Code 03 Check Control Return Air Sensor

  • Alarm Code 04 Check Control Discharge Air Sensor

  • Alarm Code 74 Controller Reset to Defaults

The following alarm codes clear automatically:

  • Alarm Code 64 Pretrip Reminder - Clears when a Pretrip Test is performed.

  • Alarm Code 84 Restart Null - Clears when the unit is no longer in a restart null due to a Prevent Alarm.

  • Alarm Code 85 Forced Unit Operation - Clears when the unit is no longer running in a forced mode due to a Prevent Alarm.

  • Alarm Code 91 Check Electric Ready Input - Clears automatically when the unit starts running.

  • 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.

  • Alarm Code 23 Cooling Cycle Fault

  • Alarm Code 24 Heating Cycle Fault

  • Alarm Code 32 Refrigeration Capacity Low

  • Alarm Code 82 Compressor Temperature Shutdown

  • Alarm Code 93 Low Compressor Suction Pressure

If the Limited Alarm Restarts II 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.

  • Alarm Code 18 High Engine Coolant Temperature

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 Language Menu or Alarms Menu will appear. If the Language Menu appears, press the NEXT key to show the Alarm Menu. When the Alarm Menu is shown, press the SELECT key.

Select Key

The Alarm Display will appear. If no alarms are present, NO ALARMS will be shown.

No Alarms

If alarms are present, the quantity of alarms (if more than one) and the most recent alarm code number will be shown. In the example shown ( Alarm Code 6), there are two alarms present. The most recent is Alarm Code 6. It indicates a problem with the coolant temperature sensor.

Alarm Code 6

After the alarm situation is resolved, press the CLEAR key to clear the alarm. For additional information regarding the alarm shown on the display, press the HELP key. To display the next alarm, press the NEXT key.

Next Key

If a serious condition occurs, the unit will be shut down to prevent damage to the unit or the load. If this occurs, the display will show that the unit is shut down and display the alarm code that caused the shutdown. In the example shown ( Help Key), the unit is shut down due to low engine oil level. For additional information regarding the alarm shown on the display, press the HELP key.

Help Key

A help message will appear. For the alarm shown ( Help Key), the message "CHECK OIL LEVEL. IF UNIT IS SHUT DOWN, REPAIR IMMEDIATELY. OTHERWISE, REPORT ALARM AT END OF THE DAY" will be shown on the display. Check the oil level and add oil as required, clear the alarm and restart the engine.

To select a different Main Menu item, press the NEXT key. To return to the Standard Display, press the EXIT key.

Important Alarm Notes

  • 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.

  • 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.

  • All alarms must be viewed before any of the alarms can be cleared.