This blog post addresses two KitchenAid dishwasher error codes, F4E2 and F4E3, which relate to the dishwasher’s heating element.

KitchenAid Dishwasher F4E2 and F4E3 Error Codes
Fixing KitchenAid Dishwasher Errors: A Guide to F4E2 and F4E3

Understanding the KitchenAid Dishwasher F4E2 and F4E3 Error Codes:

  • F4E2: This code indicates a problem with the heater relay being stuck in the “open” position. This prevents the dishwasher from heating water properly during a cycle.
  • F4E3: This code signifies the opposite issue: the heater relay is stuck “closed,” causing the heater to stay on even when not needed. This can lead to excessively hot water.

KitchenAid Dishwasher F4E2 and F4E3 Error Codes: Troubleshooting Steps

  1. Inspect heater connections: Begin by checking the wiring harness connected to the heater for any visible damage or loose connections. Fix any loose connections or replace damaged wires.
  2. Test the heater and related components resistance: With the dishwasher unplugged, use a multimeter to measure the resistance of the heater element. Compare the reading to the table provided:
Electric Part NameTemperatureOhmic Value
Heating Element25°C (77°F)26 Ω
Thermal Fuse206°C (402°F)~0.1 – 1.2 Ω
Safety Thermostat (self-reset)85°C (185°F)~0.1 – 1.2 Ω

If the measured resistance falls outside the expected range, the heater might need replacement.

  1. Check for grounding: Disconnect the heater connector and measure the resistance between the heater coil and the dishwasher’s metal body. An “open” (OL) reading indicates proper insulation. Any other reading suggests grounding, potentially damaging the control board. In such cases, replacing both the heater and control board might be necessary.
  2. Verify NTC/OWI resistance: The NTC/OWI (Negative Temperature Coefficient/Turbidity) sensor provides temperature feedback to the control board. Measure its resistance and compare it to the table:
Electric Part NameTemperatureOhmic Value
NTC Thermistor50°C (122°F)17.2 KΩ

An abnormal reading indicates a potential issue with the NTC/OWI that might require attention.

  1. Examine the Main Control Board: If the previous steps don’t resolve the issue, inspect the main control board for any signs of damage or malfunction. A faulty control board might require replacement.

Important Note: For safety reasons, consult a qualified appliance repair person if you’re uncomfortable performing any of these troubleshooting steps yourself to resolve the KitchenAid Dishwasher F4E2 and F4E3 Error Codes.

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