Fisher & Paykel Refrigerator Error Code 40

Error code 40 indicates that the transistor on the power/control module responsible for driving the icemaker water inlet solenoid has failed in a short circuit condition. The fault can be caused by the solenoid itself drawing too much current, damaged wiring, or an internal failure of the transistor. The refrigerator will typically stop ice production until the fault is corrected. Diagnosing the root cause requires checking solenoid resistance before deciding whether to replace the solenoid or the module.

Error code 40 is primarily a functional fault affecting ice production rather than a safety emergency. The control system detects the shorted transistor and disables the circuit, which helps prevent further electrical damage. Your refrigerator's cooling and food preservation functions should remain unaffected. That said, a confirmed electrical short in any appliance component should be diagnosed and repaired promptly rather than ignored.

A simple reset will not permanently clear error code 40 because the fault is caused by a hardware failure, either in the solenoid, the wiring, or the control module transistor. The code will return as soon as the refrigerator attempts to run the icemaker fill cycle again. The underlying defective component must be identified and replaced before the error will clear and stay clear.

A knowledgeable DIYer can perform the initial diagnostics, including checking the solenoid resistance and inspecting wiring and connectors for damage. If the solenoid resistance is out of range, replacing the water inlet solenoid is a manageable repair. However, if the power/control module itself needs replacement, this is a more involved repair that requires care when handling electronics and ensuring the correct replacement module is used.

Repair costs depend on which component is at fault. A replacement icemaker water inlet solenoid typically falls in the range of $20 to $80 for the part alone. A replacement power/control module is a more expensive component, generally ranging from $150 to $400 or more depending on the specific model. Adding professional labor costs will increase the total, typically by $100 to $200 depending on your location and service provider.