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ZAPI Controllers · MDI-PRC 37
Contactor Closed

What this code means

The controller checks if the MC contact is closed when the coil isn’t driven, trying to discharge the capacitor bank. If they don’t discharge, the fault condition is entered.

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

Possible causes / checks (from the source)

It is suggested to check the contactor contact, if it is mechanically stuck or pasted.

Need the part?

If diagnosis points to a failed sensor, solenoid, controller or harness part, send us the code (MDI-PRC 37), 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.