Please help ASAPPP!!! Thermo King S-600 fault code!!!

Discussion in 'Refrigerated Trucking Forum' started by hendrix69, Jul 21, 2026.

  1. Jul 21, 2026 #1
    hendrix69

    hendrix69 Bobtail Member

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    Hello my friends please give some advice about the issue of my trailer. I have currently hauling chicken load it just 5-6 pallets pretty light, I set it to 28degrees continuous but there are alarm codes 603 and 42. And It shows 30 degrees. Please check the pictures and give me advice if anybody knows about this. What part do i need to replace or what can i do about this codes? I tried to deletw the codes but it doesn’t gone. Please help. 2015 Thermo King S-600
     

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    hendrix69, Jul 21, 2026
    hendrix69, Jul 21, 2026
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  3. Jul 21, 2026 #2
    Judge

    Judge Road Train Member

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    Mar 19, 2014
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    On your Thermo King S-600, Alarm Code 603 signifies an issue with the exhaust pressure sensor, while Alarm Code 42 indicates the unit has forced itself into low speed. [1, 2]
    Typically, Code 42 is the reefer’s safety mechanism activating in response to an underlying fault (like Code 603) to protect itself from damage. [1]
    Troubleshooting Steps:
    1. Check for Blockages: Inspect the exhaust and intake areas for any obstructions, debris, or a dirty filter.
    2. Inspect Sensors: Visually check the exhaust pressure sensor and its wiring for loose connections, damage, or corrosion.
    3. Reset and Monitor: Clear the alarms from your control panel. Often, Code 42 will clear automatically once the main issue(the exhaust pressure) is resolved.
    Thermo King S-600 HELP ASAP!!!
     
    Judge, Jul 21, 2026
    Judge, Jul 21, 2026
    #2
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