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ZAPI Controllers · MDI-PRC 78
VACC Not OK

What this code means

The test is made at key-on and after 20 sec that both the travel demands have turned disactive. This alarm occurs if the ACCELERATOR reading in the TESTER menu is higher than 1.0 V (it means the wiper of the potentiometer is higher than 2 Vdc) when the accelerator is released.

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

Possible causes / checks (from the source)

Check the mechanical calibration and the functionality of the potentiometer.

Need the part?

If diagnosis points to a failed sensor, solenoid, controller or harness part, send us the code (MDI-PRC 78), 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; corroborated by ZAPI AC0 Inverter manual (eastelite.co.za). Cross-checked in two independent sources. Compiled 2026-10-30. No manufacturer affiliation.