Fisher & Paykel Dishwasher Error Code E4

E4 indicates a heater plate fault. Sub code 01 means the heating element failed to reach the target temperature within the allowed time, while sub code 02 means the dropper resistor in the heater circuit has an open circuit. Both conditions prevent the dishwasher from completing a normal wash cycle. The controller detects these faults by monitoring heating performance and component continuity.

No, you should not continue running the dishwasher while E4 is active. The fault indicates a problem in the heating circuit, which may involve damaged wiring or arcing components. Running the machine in this condition could worsen the damage or create an electrical safety hazard. Leave the dishwasher powered off until the fault is diagnosed and repaired.

Resetting the dishwasher may temporarily clear the E4 code, but the fault will return as soon as the machine attempts to heat water if the underlying problem has not been fixed. A reset does not repair a failed element, open dropper resistor, or damaged wiring harness. Use any reset only as a way to confirm the fault is recurring, not as a solution.

Some causes of E4 are accessible to a confident DIYer. Checking and reseating the harness connectors at the heater plate and controller requires no special tools and should be the first step. Testing the heating element and dropper resistor with a multimeter is also straightforward. However, replacing heater plate components or the controller board involves working with mains voltage wiring and is best handled by a qualified technician.

Repair costs depend on which component has failed. If the issue is limited to corroded connectors, the fix may cost very little beyond a service call fee, typically in the range of $80 to $150. Replacing a heating element or dropper resistor will add parts costs, usually bringing the total to $150 to $350. A controller board replacement is the most expensive scenario, potentially ranging from $250 to $500 or more including labor.