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Error code reference

Fisher & Paykel Washer Error Code 21

Water valve circuit is drawing too high a current.

Fisher & Paykel codesFisher & Paykel washer codes

Water valve circuit is drawing too high a current.

First step from the service manual

Check that the resistance of the water valves are 61-64Ω @ 68°F (20°C).

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

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What 21 means on a Fisher & Paykel washer

Error code 21 on a Fisher & Paykel washer indicates that the water valve circuit is drawing an abnormally high current. The control board continuously monitors the current flowing through the water inlet valve circuit, and when that current exceeds the acceptable threshold, it triggers this fault to protect the circuit from damage. The water inlet valves are solenoid-operated components that open and close to allow hot and cold water into the drum, and their electrical characteristics must fall within a specific range for safe, reliable operation.

The primary diagnostic checkpoint for this error is measuring the resistance of the water valves, which should read between 61 and 64 ohms at 68 degrees Fahrenheit (20 degrees Celsius). A resistance reading below this range indicates a shorted valve coil, which would cause the circuit to draw excess current. Resistance significantly above or below spec, or a reading of zero ohms, points directly to a failed valve solenoid. Temperature affects resistance readings, so testing should be performed at or near the specified ambient temperature for accurate results.

Beyond a faulty valve coil itself, excess current draw can also result from damaged wiring in the valve harness, including chafed insulation causing a short to ground, or corroded connector pins creating unintended current paths. In some cases the control board's valve driver circuit may be partially failed, misreading current or supplying incorrect voltage. Systematic testing of each valve individually, combined with harness inspection, helps isolate whether the fault lies in the valve assembly, the wiring, or the board.

Source: manufacturer service documentation.

Common causes of 21

  1. 01

    Shorted water inlet valve coil

    Part replacement

    A failed solenoid coil inside the water inlet valve can short internally, dropping resistance below the 61-64 ohm specification and causing excessive current draw. Measure resistance across each valve coil with a multimeter to confirm.

  2. 02

    Damaged valve wiring harness

    Part replacement

    Chafed, pinched, or melted wiring in the harness connecting the valves to the control board can create a short circuit that increases current beyond safe levels. Inspect the full harness run for visible insulation damage or burnt spots.

  3. 03

    Corroded or shorted wiring connectors

    Wiring / connection

    Corrosion or moisture intrusion at the valve connector pins can bridge contacts and create unintended current paths. Disconnect and inspect each connector for green corrosion, burnt contacts, or moisture residue.

  4. 04

    Multiple valves connected simultaneously causing combined current overload

    Part replacement

    If a control board fault causes more than one valve to energize at the same time, the combined current draw can exceed circuit limits. This scenario typically accompanies additional error codes or erratic fill behavior.

  5. 05

    Faulty control board valve driver circuit

    Part replacement

    The section of the control board that drives the valve solenoids can fail and either supply incorrect voltage or misread current levels, triggering a false or genuine overcurrent condition. This is the least common cause and should be considered only after the valves and harness have been ruled out.

See the test procedure for each cause

Frequently asked questions about 21

What does 21 mean on a Fisher & Paykel washer?
Error code 21 means the control board has detected that the water valve circuit is drawing too much current. This fault is designed to protect the circuit from damage caused by a shorted valve coil or wiring problem. The first step is to measure the resistance of the water inlet valves, which should be between 61 and 64 ohms at 68 degrees Fahrenheit. If a valve reads outside that range, it needs to be replaced.
Can I fix error code 21 on my Fisher & Paykel washer myself?
A knowledgeable DIYer comfortable with a multimeter can perform the key diagnostic step: checking water valve resistance against the 61-64 ohm specification. If a valve coil is confirmed shorted, replacing the water inlet valve is a straightforward repair involving disconnecting the hoses, unplugging the harness connector, and installing the new valve. Wiring harness repairs require more skill, and control board replacement is generally best left to a technician.
Is it safe to keep using my washer when error code 21 appears?
No, you should not continue running the washer while this error is active. An overcurrent condition in the valve circuit can damage the control board or wiring harness, turning a relatively inexpensive repair into a more costly one. Stop using the machine and perform diagnostics before attempting another wash cycle.
How much does it cost to repair error code 21 on a Fisher & Paykel washer?
If a water inlet valve is the culprit, parts typically range from $30 to $80 depending on the specific model, and a technician visit to diagnose and replace it usually adds $100 to $200 in labor. If the control board is at fault, the total repair cost can rise to $200 to $450 or more. Getting a confirmed diagnosis before ordering parts helps avoid unnecessary expense.
Will resetting my Fisher & Paykel washer clear error code 21?
A reset may temporarily clear the code and allow the machine to start, but if an underlying fault such as a shorted valve coil or damaged wiring is present, the error will return as soon as the valve circuit is energized. Clearing the code without fixing the root cause does not protect the machine from ongoing overcurrent damage. A proper resistance test of the valves is needed to determine whether a reset alone is sufficient.

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