How to Understand Thermo King Alarms

Posted on June 26, 2017

Thermo King unit alarms are easy to spot and understand.  If alarms are present, the ALARM ICON will show up on the controller and an indication will be present on the status light. Some Thermo King units will indicate the type of alarm, and some require you to check a code sheet for information, which can be found on our website.

Do a simple Thermo King PRETRIP TEST.  From the display, press the MENU KEY, and then press the UP or DOWN KEY to start a PRETRIP TEST.  If the unit is not running, a full pretrip will be initiated, which will take approximately 20 minutes. If the unit is running, a running pretrip will be performed. When all pretrip tests are complete, the results are reported as PASS, CHECK, or FAIL.  If the result is CHECK or FAIL, the unit will report the accompanying alarm codes to direct a technician to the cause of the problem.

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