Fisher & Paykel Washer Error Code 72

Error code 72 on a Fisher & Paykel washer indicates a pressure transducer error caused by maximum positive drift. The pressure transducer is a sensor that monitors water level inside the drum by measuring air pressure within a sealed chamber connected to the tub. During operation, the control module periodically re-calibrates the transducer's zero point to ensure accurate water level readings. When this live zero re-calibration value deviates significantly from the factory-programmed zero baseline, the controller flags error 72 and halts the cycle to prevent overfilling or incorrect water level behavior.

The root cause is typically a failure within the Motor Control Module, which is responsible for processing the transducer signal, performing the re-calibration routine, and acting on the resulting water level data. When the module's analog input circuitry degrades or its internal reference values become corrupted, it can misread the transducer output and register an extreme positive drift even when the transducer itself is functioning within normal parameters. This is why the primary diagnostic step points directly to replacing the Motor Control Module rather than the sensor.

In some cases, the pressure transducer itself may have drifted out of specification, or the air chamber hose connecting the tub to the transducer may be kinked, blocked, or leaking, which could cause abnormal pressure readings that push the calibration offset beyond acceptable limits. However, since the error specifically references the re-calibration comparison against a factory zero, a faulty Motor Control Module is the most likely origin of the fault and should be addressed first.