The controller uses a "Flash Code" system via a status LED or detailed text strings on a programmer to communicate errors. Common Diagnostic Codes:
Note: Always verify the full model number (e.g., 1520-2401, 1520-4803) before referencing a manual, as I/O configurations and shunt calibration differ between sub-models.
The Curtis 1520 has a built-in Status LED (usually red or green). Without the manual, this LED is your primary diagnostic tool. When you turn on the keyswitch, watch the flash sequence.
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