Error code reference

Frigidaire Dishwasher Error Code i56

DC Link under voltage

DC Link under voltage - Vbat voltage on motor control board detected lower than 225V DC.

First step from the service manual

Check wash and drain motor wire harness and connections to PCB

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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i56 on my Frigidaire Dishwasher

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DC Link under voltage - Vbat voltage on motor

From Service Manual 856400, p.12:

1.Check wash and drain motor wire harness and connections to PCB

2.Measure drain pump winding resistance at connector J7 on the main control. Expected: 12 to 16 ohms at room temperature.

3.Back-probe the pump driver output under load. Verify the board switches the pump at 120 VAC during the drain portion of the cycle.

Part 5304497818

Drain pump

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