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ZAPI Controllers · MDI-PRC 74
Driver Shorted

What this code means

This alarm occurs when the voltage on the Main Contactor is higher than expected: this means that the Main Contactor Coil has a high voltage although it is not supplied.

Applies to: ZAPI AC-0 SSL Sensored inverter (traction & pump configuration).

Possible causes / checks (from the source)

Probably it is necessary to replace the controller because the driver of the Main Contactor is short circuited.

Need the part?

If diagnosis points to a failed sensor, solenoid, controller or harness part, send us the code (MDI-PRC 74), machine model and serial number — we quote genuine and OEM replacement parts for export.

Source: ZAPI AC-0 SSL Sensored User Manual (AE0ZP0EC) via ManualsLib. Single published source — confirm against the manual for your exact model before ordering parts. Compiled 2026-10-30. No manufacturer affiliation.