Fisher & Paykel Refrigerator Error Code 42

Error code 42 on a Fisher & Paykel refrigerator indicates that the icemaker fill tube nozzle heater is drawing an abnormally high current. This heater is responsible for preventing ice buildup inside the fill tube nozzle, which is the point where water enters the icemaker. When current through this heater circuit exceeds the expected operating range, the controller flags the fault. Importantly, this code is not displayed on the refrigerator's standard interface and is only visible when retrieving diagnostic data using Fisher & Paykel's Smart tool, meaning it may exist as a logged fault without the user ever seeing a visible error on the appliance itself.

High current in a heater circuit typically points to a short circuit within the heater element itself, a wiring fault causing reduced resistance in the circuit, or a problem with the connections at the controller. A heater drawing excessive current usually has a resistance value lower than its rated specification, which can be confirmed with a multimeter. Checking the resistance of the nozzle heater is the primary diagnostic step, alongside inspecting all wiring connectors between the heater and the control board for corrosion, damage, or loose pins.

If the heater resistance reads lower than the expected value for a properly functioning element, the heater itself is likely shorted internally and will need replacement. If resistance appears normal, attention should shift to the wiring harness and the controller connections, as a fault in those pathways can also produce an elevated current reading. Leaving a high-current fault unresolved risks overloading the control board circuit responsible for powering the heater.