Sharp Heater Fault

Dishwasher shows F3; water stays cold and cycle may be extended.

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.

Possible Causes

Burnt-out heater element, Faulty NTC sensor, Loose heater wiring, Defective heater relay on PCB

Safety first: Disconnect power and allow the unit to cool.

Confirm no heating: Run a hot program and check if the interior is warm after 15–20 minutes. If cold, suspect heater circuit.
Inspect wiring: Access the Sharp heater assembly and check for burnt or loose connectors.
Measure heater resistance: With a multimeter, check for continuity across the heater terminals. Replace the heater if open-circuit.
Check NTC: Test the NTC sensor and replace if readings are abnormal.

Hard 4/5

Flow-Through Heater Assembly

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