Thermo King SR4 1H64617001 Control Unit

The Thermo King SR4 1H64617001 is a Smart Reefer controller (HMI) used in commercial truck refrigeration units to monitor and regulate cabin and cargo temperatures. Common failure points for this class of controllers include power supply degradation, LCD backlight or display panel faults, internal board component burn‑outs, and loss of communication with the temperature sensors or compressor relay. Initial troubleshooting should verify 24 V DC input voltage, inspect the HMI for visible damage or loose connectors, and review any diagnostic error codes displayed on the unit’s screen before proceeding to deeper board diagnostics.[oss-gpt-20b] Post Comment

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