F40
Kenmore
Line Voltage / Power Supply Error
Dishwasher displays F40 and will not start a cycle.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Incorrect supply voltage, Loose power connection at terminal block, Tripped breaker or shared circuit issues, Faulty main control power supply
How to Fix / Troubleshooting
Safety first: Turn off the circuit breaker before opening any electrical compartments.
- Verify dedicated circuit: Ensure the dishwasher is on its own properly sized circuit as per local code and manufacturer specs.
- Check terminal block: Remove the lower access panel and inspect the power terminal block. Tighten any loose screws and look for burned wires. Replace damaged wiring and block.
- Measure voltage: With a qualified person and proper meter, confirm correct voltage at the terminal block (typically 120 VAC in North America).
- Inspect control board: If supply voltage is correct but F40 persists, the main control’s power supply section may be faulty and require replacement.
If you are not comfortable working with live electrical circuits, contact a qualified technician.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board
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