Fisher & Paykel Washer Error Code 66

Error code 66 indicates a Phase 6 pressure transducer fault where the frequency signal from the pressure transducer has risen above 90 kHz, which is outside the acceptable operating range. The Motor Control Module detects this out-of-range signal and stops the washer. This code replaced the earlier fault code 65 starting with V41 Motor Control Module firmware versions and later.

It is not recommended to continue running the washer while error code 66 is active. The fault indicates the water level sensing system is not functioning correctly, which could lead to improper fill levels or unpredictable washer behavior. Stopping use until the fault is diagnosed and repaired is the safest course of action.

A reset may temporarily clear the error code display, but if the underlying fault with the pressure transducer signal or Motor Control Module remains, the code will return during the next wash cycle. Resetting is useful for confirming whether the fault is intermittent, but it is not a permanent fix. The root cause must be diagnosed and corrected to resolve the error long-term.

Some basic checks, such as inspecting the pressure hose for kinks or blockages and checking wiring connections, can be done by a knowledgeable DIYer. However, the primary recommended fix is replacing the Motor Control Module, which is a complex repair that typically requires technical experience and proper tools. Most homeowners should have a qualified technician handle this repair.

Repair costs vary depending on the root cause. If only a hose inspection or wiring repair is needed, costs may be relatively low, typically in the range of $75 to $150 for a service call. If the Motor Control Module requires replacement, parts and labor combined can range from $200 to $450 or more depending on your location and the technician's rates.