Error code reference

Whirlpool Dishwasher Error Code FB

MDV (Diverter Motor) defective

Whirlpool codes Whirlpool dishwasher codes

MDV (Diverter Motor) defective - after water inlet starts, WI changes after 15 sec, but no signal from MDV received by control board within 120 seconds, or spray arm not functioning.

First step from the service manual

Check that upper and lower spray arms alternate turns approximately every 30-40 sec; check if diverter disc in sump is blocked; verify 230V from control board (ZW, DVH) to MDV.

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

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Step-by-step tests with expected resistance, voltage, and continuity values
Wiring diagram references and connector pinouts from the OEM service manual
Verified part numbers when replacement is required

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FB on my Whirlpool WDT730PAHZ

M+

MDV (Diverter Motor) defective - after water

From Tech Sheet W12673796, p.48:

1.Check that upper and lower spray arms alternate turns approximately every 30-40 sec; check if diverter disc in sump is blocked; verify 230V from control board (ZW, DVH) to MDV.

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 W10876537

Drain pump assembly

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First step from the service manual

Get the full diagnostic procedure for FB.

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