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Error code reference

Fisher & Paykel Dishwasher Error Code E9

Microcontroller fault

Fisher & Paykel codesFisher & Paykel dishwasher codes

Microcontroller fault – includes ADC error (sub code 04), PSU overvoltage (sub code 05), EE/I2C/Software reset (sub code 06), or PSU crowbar (sub code 07).

First step from the service manual

For sub code 04: Replace the badge isolator if present and run a fast test cycle. For sub code 05: Check harness connections. For sub code 06: Replace the controller. For sub code 07: Inspect all component terminals and connectors for damage.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What E9 means on a Fisher & Paykel dishwasher

The E9 error code on a Fisher & Paykel dishwasher indicates a microcontroller fault within the main control board. This code covers four distinct sub-codes, each pointing to a different failure mode. Sub code 04 signals an ADC (analog-to-digital converter) error, meaning the controller is failing to correctly read sensor input signals. Sub code 05 indicates a PSU overvoltage condition, where the power supply unit is delivering voltage beyond the acceptable operating range. Sub code 06 covers EE (EEPROM), I2C bus, or software reset faults, pointing to corrupted memory or communication failures between internal controller components. Sub code 07 identifies a PSU crowbar event, which is a protective circuit activation triggered when the power supply voltage spikes dangerously high.

Each sub code requires a different diagnostic approach. An ADC error (04) can sometimes be traced to interference introduced by the badge isolator, and replacing that component followed by a fast test cycle is the recommended first step. An overvoltage fault (05) calls for a careful inspection of harness connections at the control board and power supply, as loose or corroded terminals can cause erratic voltage readings. A software or memory fault (06) typically means the controller itself has failed internally and requires replacement. A crowbar event (07) demands a thorough inspection of all component terminals and connectors throughout the dishwasher for signs of burning, arcing, or physical damage.

Because E9 encompasses both power supply and microcontroller logic failures, accurate repair depends on identifying the specific sub code before replacing any parts. Misdiagnosis is common when the sub code is overlooked, leading to unnecessary controller replacements when the actual fault is a wiring issue or a damaged isolator.

Source: manufacturer service documentation.

Common causes of E9

  1. 01

    Failed or faulty badge isolator (sub code 04)

    Part replacement

    The badge isolator can introduce interference that disrupts the controller's analog-to-digital converter. Replacing the badge isolator and running a fast test cycle is the first recommended step for sub code 04.

  2. 02

    Loose or corroded harness connections (sub code 05)

    Wiring / connection

    Overvoltage readings reported in sub code 05 can result from poor electrical connections at the power supply or control board harness. Inspect all connectors for corrosion, looseness, or damaged pins.

  3. 03

    PSU crowbar circuit activation (sub code 07)

    Wiring / connection

    Sub code 07 means the protective crowbar circuit fired in response to a voltage spike. Inspect all component terminals and connectors throughout the machine for burning, arcing, or physical damage before assuming the power supply itself has failed.

  4. 04

    Internal controller failure, EEPROM or I2C fault (sub code 06)

    Part replacement

    Sub code 06 indicates a failure in the controller's memory or internal communication bus. This type of fault does not have an external cause to diagnose and requires replacing the control board.

  5. 05

    Power supply unit failure

    Part replacement

    If harness connections are sound and the crowbar or overvoltage fault persists, the PSU itself may be generating out-of-range voltages. A failed PSU will require replacement of the relevant board or module.

See the test procedure for each cause

Frequently asked questions about E9

What does E9 mean on a Fisher & Paykel dishwasher?
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.
Can I fix an E9 error on my Fisher & Paykel dishwasher myself?
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.
Is it safe to keep using my dishwasher when it shows E9?
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.
Will resetting my Fisher & Paykel dishwasher clear the E9 error?
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.
How much does it cost to repair an E9 error on a Fisher & Paykel dishwasher?
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.

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