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Error code reference

Vision Washer Error Code Er:21

Foam detected.

Vision codesVision washer codes

Foam detected.

First step from the service manual

Consult customer about dosing.

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

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What Er:21 means on a Vision washer

Er:21 on a Vision washer indicates that the machine has detected excess foam inside the drum during a wash or rinse cycle. The washer's control system monitors conditions inside the tub and, when foam levels rise beyond an acceptable threshold, it triggers this error to interrupt or modify the cycle. This protection mechanism exists to prevent foam from migrating into the pump, motor, or other mechanical components where it could cause damage or reduce wash performance.

The most common root cause is the use of too much detergent, the wrong type of detergent, or a combination of both. High-efficiency washers require low-sudsing HE-rated detergents. Using standard detergents, or even HE detergents in excessive quantities, can generate far more foam than the machine is designed to handle. Residual detergent buildup inside the drum or dispenser from previous cycles can also compound the problem, producing foam even when the current detergent dose appears correct.

When Er:21 appears, the machine may attempt to resolve the issue by adding extra rinse cycles or pausing until foam dissipates. The first recommended step is to discuss detergent usage with the customer, confirming the type and quantity of detergent being used per load. Identifying whether the issue recurs consistently or only under certain load conditions helps narrow down whether the cause is habitual overdosing, a specific detergent brand, or residue accumulation in the machine.

Source: manufacturer service documentation.

Common causes of Er:21

  1. 01

    Excess detergent dosing

    Wiring / connection

    Using more detergent than the load size or water level requires is the leading cause of Er:21. Check the detergent packaging for HE washer dosing guidelines and reduce the amount used per cycle.

  2. 02

    Wrong detergent type

    Wiring / connection

    Standard detergents produce significantly more suds than HE-rated detergents and can overwhelm a high-efficiency washer. Confirm the detergent bottle carries an HE symbol before using it in a Vision washer.

  3. 03

    Detergent residue buildup inside the machine

    Wiring / connection

    Repeated overdosing over time can leave soap residue in the drum, dispenser drawer, and hoses. This residue can reactivate during subsequent cycles and generate foam even when the current dose is correct.

  4. 04

    Concentrated or gel detergent used without dose adjustment

    Wiring / connection

    Ultra-concentrated detergents require a much smaller dose than standard formulas. Using the same volume as a regular detergent with a concentrated product often leads to excessive sudsing and triggers Er:21.

  5. 05

    Faulty foam or pressure sensor

    Part replacement

    In rare cases, the sensor or control component responsible for detecting foam levels may malfunction and report excess foam when none is present. This is suspected when the error occurs consistently even after correcting all detergent-related variables.

See the test procedure for each cause

Frequently asked questions about Er:21

What does Er:21 mean on a Vision washer?
Er:21 means the washer has detected excess foam inside the drum during a cycle. The machine triggers this error to protect its internal components from damage caused by over-sudsing. It is most commonly caused by using too much detergent or a detergent not rated for high-efficiency washers.
How do I fix Er:21 on my Vision washer?
Start by reducing the amount of detergent you use and switching to an HE-rated low-sudsing detergent if you have not already done so. Run a drum cleaning cycle to clear any soap residue that may have built up inside the machine. If the error continues after correcting your detergent habits, a technician may need to inspect the foam detection components.
Will resetting my Vision washer clear the Er:21 error?
Resetting the washer may clear the error code temporarily, but it will return if the underlying cause is not addressed. The washer's foam detection system will trigger Er:21 again as soon as excess suds are detected in a future cycle. Correcting detergent type and dosage is necessary for a lasting fix.
Is it safe to keep using my Vision washer when Er:21 appears?
You should not ignore the error and force cycles to continue without addressing the foam issue. Excess foam can work its way into the pump and motor area, potentially causing damage over time. Resolve the detergent issue first before resuming normal use of the machine.
How much does it cost to repair a Vision washer showing Er:21?
If the cause is simply excess or incorrect detergent, there is no repair cost involved, just a change in product and dosage. If a faulty sensor or control component is responsible, parts and labor costs could range from roughly $80 to $250 depending on the specific component and local service rates. A technician visit for diagnosis typically costs between $60 and $120.

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