Fisher & Paykel Dishwasher Error Code E9

E9 indicates a microcontroller fault that can involve one of four specific failure types, each identified by a sub code: ADC error (04), PSU overvoltage (05), EEPROM or I2C or software reset (06), or PSU crowbar activation (07). The sub code is essential for directing the correct repair. Without knowing the sub code, it is difficult to determine whether the fault lies in a small isolator component, a wiring harness, or the control board itself.

It is not advisable to continue running the dishwasher when E9 is displayed, particularly for sub codes related to power supply faults such as 05 and 07. These indicate voltage abnormalities that could cause further damage to the control board or other components. Stop using the appliance and address the fault before resuming normal use.

Repair costs vary depending on which sub code is present. Simple repairs such as replacing a badge isolator or reseating harness connections tend to be in the lower cost range, typically between $50 and $150 including labor. Control board or power supply replacement can cost significantly more, often ranging from $200 to $500 or higher depending on parts availability and labor rates in your area.

Some sub codes under E9 involve steps that a skilled DIYer can attempt, such as checking harness connections (sub code 05) or inspecting terminals for damage (sub code 07). However, sub code 06 requires control board replacement, and sub code 04 requires identifying and replacing the badge isolator, both of which involve working with electronic components. If you are not comfortable working with appliance electronics and wiring, a qualified technician is recommended.

A power reset may temporarily clear the error display, but it will not resolve the underlying fault. Sub codes 04, 05, 06, and 07 each represent hardware or firmware conditions that require physical inspection or component replacement. If the fault condition still exists after a reset, E9 will return when the dishwasher is operated.