Viking Dishwasher Error Code 4-3
Dispenser Error
Dispenser Error - dispenser current sense is out of range (service cycle only).
First step from the service manual
Check wires disconnected between main control and dispenser.
The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.
Get the full diagnostic procedure for 4-3.
- 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
$29/month · Cancel anytime · Or $9.95 3-day pass
What 4-3 means on a Viking dishwasher
Error code 4-3 on a Viking dishwasher indicates a Dispenser Error, specifically that the current sense reading for the detergent dispenser circuit is out of the expected range. This code is triggered only during a service cycle, meaning it will not appear during a normal wash cycle run by the homeowner. The main control board monitors the current flowing through the dispenser actuator to confirm the component is operating correctly. When that measured current falls outside the acceptable window, either too low or too high, the control flags a 4-3 fault.
The dispenser system relies on a wired connection between the main control board and the dispenser assembly. If that wiring harness is loose, damaged, or has a broken connector pin, the current sense circuit cannot get an accurate reading. A failed dispenser actuator or solenoid can also draw incorrect current, triggering the fault. Because the error is tied to current sensing rather than a simple open or short circuit, intermittent wiring faults are a particularly common culprit and can be difficult to reproduce outside of the service cycle test.
Diagnosis should begin by inspecting all wires and connectors running between the main control board and the dispenser assembly. Look for terminals that have backed out of their housings, corroded pins, or chafed insulation causing intermittent contact. If the wiring checks out, the dispenser actuator itself should be tested for proper resistance and current draw to determine whether the component has failed internally.
Source: manufacturer service documentation.
Common causes of 4-3
- 01
Loose or disconnected wiring between control board and dispenser
Wiring / connectionThe connector or individual wire terminals linking the main control board to the dispenser assembly may have come loose or backed out of their housing. Inspect each connector at both ends of the harness for secure seating and look for any pins that appear bent or pushed back.
- 02
Corroded or damaged wiring harness
Part replacementMoisture exposure inside the door can corrode connector pins or degrade wire insulation, causing resistance to increase and the current reading to fall out of range. Look for discoloration, greenish deposits on terminals, or chafed wire insulation along the harness routing.
- 03
Failed dispenser actuator or solenoid
Part replacementThe internal actuator or solenoid that physically opens the detergent cup can fail, causing it to draw too little or too much current. If the wiring checks out, the dispenser assembly likely needs to be replaced.
- 04
Faulty main control board
Part replacementIf the wiring and dispenser actuator both test within normal parameters, the current sense circuit on the main control board itself may have failed. This is the least common cause and should be considered only after other components are ruled out.
Frequently asked questions about 4-3
What does 4-3 mean on a Viking dishwasher?
How do I fix error code 4-3 on my Viking dishwasher?
Is it safe to use my Viking dishwasher while error code 4-3 is active?
Will resetting the dishwasher clear error code 4-3?
How much does it cost to repair a Viking dishwasher showing error code 4-3?
78,000+ service manuals · 160,000+ error codes · 55+ brands
Get Started$29/month · Cancel anytime · Or $9.95 3-day pass