Fisher & Paykel DishDrawer Error Code F4 — NTC Temperature Sensor Fault
What this means
Error code F4 on Fisher & Paykel DishDrawer dishwashers indicates the NTC (Negative Temperature Coefficient) thermistor sensor has returned a reading outside the expected range. This sensor monitors wash water temperature and communicates with the control board to regulate the heater. If the sensor is disconnected, short-circuited, or damaged, the control board cannot reliably manage heating and triggers F4 as a safety precaution. The DishDrawer will not complete a wash cycle with this code active.
Alternate codes: Fault 4, Error F4
Step-by-step fix
4 stepsPower cycle the DishDrawer
Turn off power at the breaker for 2 minutes and restore it. Run a cycle to see if the F4 code clears. A temporary electrical glitch can occasionally produce a false F4 reading.
If F4 appears intermittently rather than every cycle, it may indicate a loose connector rather than a failed sensor.
Test the NTC sensor resistance
Disconnect power. Access the NTC sensor located near the sump or heater area. Disconnect its wiring and measure resistance with a multimeter. At room temperature (25°C / 77°F), the sensor should read approximately 50,000 ohms. A reading of zero (short circuit) or infinity (open circuit) confirms a failed sensor.
Record the exact resistance reading — Fisher & Paykel service techs use this value to determine if the sensor has drifted out of specification even if it is not fully failed.
Inspect the sensor wiring
Trace the sensor wires back to the control board connector. Check for any pinched, frayed, or corroded wires. The DishDrawer environment is humid, and wire connections near the sump area can corrode over time. Clean any corrosion with electrical contact cleaner and ensure connectors are seated firmly.
Use dielectric grease on the sensor connector after cleaning to prevent future corrosion.
Replace the NTC sensor
If the sensor reads outside specification, replace it. The NTC sensor is typically held in place with a clip or single screw. Remove the old sensor, install the new one in the same position, and reconnect the wiring. Restore power and test.
Ensure the sensor tip makes good thermal contact with the sump or heater housing — a sensor that is not seated properly will give inaccurate readings.
When to call a professional
If the sensor and wiring test fine but F4 persists, the control board's analog input circuit may be faulty. A technician with Fisher & Paykel diagnostic software can pinpoint the issue.
Related error codes
Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.
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