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Error code reference

Fisher & Paykel Washer Error Code Err 105

Communication error between the motor control module and the display PCB.

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Communication error between the motor control module and the display PCB.

First step from the service manual

Check the communication harness for continuity between connector CN8 of the display PCB and connector P324 of the motor control module.

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

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What Err 105 means on a Fisher & Paykel washer

Err 105 on a Fisher & Paykel washer indicates a loss of communication between the motor control module and the display PCB. These two boards continuously exchange data signals during operation to coordinate motor speed, cycle progression, and user interface feedback. When that signal is interrupted or corrupted, the washer cannot safely continue and halts with this fault code.

The communication link between the two boards travels through a dedicated wiring harness. The diagnostic starting point is to check continuity on this harness between connector CN8 on the display PCB and connector P324 on the motor control module. A break, short, or loose pin anywhere along this path will sever communication and trigger the fault. Corrosion, vibration-related fretting on connector terminals, and physical damage from pinched wiring are common harness failure modes.

If the harness tests good for continuity, the fault likely originates in one of the two control boards themselves. Either the display PCB or the motor control module may have failed internally, preventing it from sending or receiving the communication signal correctly. Board-level failures can result from power surge damage, moisture ingress, or component fatigue over time. Systematic testing of the harness first, then each board, is the correct diagnostic sequence.

Source: manufacturer service documentation.

Common causes of Err 105

  1. 01

    Loose or disconnected harness connector

    Wiring / connection

    The connector at CN8 on the display PCB or P324 on the motor control module may have vibrated loose over time. Reseating both connectors firmly is the first physical check after confirming continuity.

  2. 02

    Damaged or broken communication harness

    Part replacement

    Wires in the harness between the two boards can become pinched, chafed, or broken, especially if routed near moving components. A continuity test on each wire in the harness will identify an open circuit.

  3. 03

    Corroded connector terminals

    Wiring / connection

    Moisture inside the cabinet can cause oxidation on the connector pins at CN8 or P324, increasing resistance and disrupting the data signal. Terminals should be inspected for discoloration or buildup and cleaned or replaced as needed.

  4. 04

    Failed display PCB

    Part replacement

    If the harness is intact and connectors are secure, the display PCB may have failed internally and can no longer send or receive communication signals. Board replacement is required if the PCB is confirmed faulty.

  5. 05

    Failed motor control module

    Part replacement

    The motor control module can fail due to power surges or component wear, causing it to drop communication with the display PCB. This is typically diagnosed after the harness and display PCB have been ruled out.

See the test procedure for each cause

Frequently asked questions about Err 105

What does Err 105 mean on a Fisher & Paykel washer?
Err 105 indicates a communication failure between the motor control module and the display PCB. The two boards exchange data signals continuously during a wash cycle, and when that link is lost, the washer stops and displays this code. The fault can originate in the wiring harness connecting the boards or in one of the boards themselves. Diagnostic work begins by checking the harness between connector CN8 on the display PCB and connector P324 on the motor control module.
Can I fix Err 105 myself, or do I need a technician?
A knowledgeable DIYer can inspect and reseat the wiring connectors at CN8 and P324, and test the harness for continuity with a multimeter. If the connectors are secure and the wiring is intact, diagnosing and replacing a faulty control board typically requires more technical confidence and the right replacement parts. If you are not comfortable working with electronic components inside the washer cabinet, a qualified appliance technician is the safer option.
Is it safe to keep using my washer when Err 105 appears?
No. The washer halts operation when Err 105 is triggered because the motor control module and display PCB can no longer coordinate safely. Running the machine in this state is not recommended, as the motor cannot receive proper control signals. The fault should be diagnosed and resolved before resuming normal use.
Will resetting the washer clear Err 105?
A power reset may temporarily clear the error code, but if the underlying wiring or board fault is still present, Err 105 will return as soon as the washer attempts to operate. A reset is a reasonable first step to rule out a transient glitch, but a persistent Err 105 requires physical inspection of the harness and control boards.
How much does it cost to repair Err 105 on a Fisher & Paykel washer?
Repair costs vary depending on the root cause. If only the harness needs replacement, parts and labor typically fall in the lower range, often between $75 and $200. If a control board such as the display PCB or motor control module requires replacement, costs can range from $150 to $400 or more depending on parts pricing and labor rates in your area. Getting a diagnostic quote from a technician before committing to board replacement is advisable.

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