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Error code reference

Jenn-Air Dishwasher Error Code E:26

Water switch fault; no impulses from water switch despite actuation; permanent activation of water switch.

Jenn-Air codesJenn-Air dishwasher codes

Water switch fault; no impulses from water switch despite actuation; permanent activation of water switch.

First step from the service manual

Check wires; measure mains voltage on the motor; test switch at water switch.

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

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What E:26 means on a Jenn-Air dishwasher

The E:26 error code on a Jenn-Air dishwasher indicates a water switch fault. The water switch is a flow-sensing component that generates electrical impulses as water moves through the system. Under normal operation, the control board monitors these impulses to confirm that water is flowing at the correct rate and volume. When the board detects no impulses from the water switch despite the switch being actuated, or conversely detects a permanent activation signal with no interruption, it registers E:26 and halts the cycle to prevent damage.

This fault has two distinct failure modes. The first is a lack of impulses: the switch is triggered but no signal reaches the control board, which typically points to a wiring problem, a failed switch, or a break in the signal circuit. The second is permanent activation: the switch sends a continuous signal without the expected cycling pattern, which can indicate a stuck or shorted switch. In either case, the control board cannot accurately determine water flow status, making safe cycle completion impossible.

Diagnosing E:26 begins with a visual and electrical inspection of the wiring harness connected to the water switch, checking for loose connectors, corrosion, or damaged insulation. The next step is measuring mains voltage at the wash motor to confirm the motor is receiving power and is capable of driving water flow. Finally, the switch itself should be tested directly to determine whether it is producing the correct impulse signal or is stuck in an open or closed state.

Source: manufacturer service documentation.

Common causes of E:26

  1. 01

    Faulty or damaged wiring harness

    Wiring / connection

    Loose connectors, corroded terminals, or broken wires between the water switch and the control board can interrupt the impulse signal entirely or cause erratic readings. Inspect the full length of the wiring harness for visible damage and reseat all connectors.

  2. 02

    Failed water switch

    Part replacement

    The water switch itself can fail in an open state, producing no impulses, or in a closed state, producing a permanent signal. Testing the switch directly with a multimeter will confirm whether it is functioning within its expected parameters.

  3. 03

    Wash motor not receiving mains voltage

    Wiring / connection

    If the wash motor is not receiving proper mains voltage, it will not run and no water will flow, meaning the switch has nothing to detect. Measuring voltage directly at the motor terminals will confirm whether this is a contributing factor.

  4. 04

    Wash motor failure

    Part replacement

    A motor that receives correct voltage but does not operate will produce no water flow and therefore no switch impulses. If voltage is confirmed at the motor terminals but the motor does not run, the motor itself may need replacement.

  5. 05

    Water switch stuck due to debris or mineral buildup

    Wiring / connection

    Hard water deposits or debris can physically jam the water switch mechanism, causing it to remain permanently open or closed. Inspecting and cleaning the switch housing may restore correct operation without requiring a full replacement.

See the test procedure for each cause

Frequently asked questions about E:26

What does E:26 mean on a Jenn-Air dishwasher?
E:26 indicates a water switch fault. The control board has detected either no impulses from the water switch when it should be receiving them, or a constant uninterrupted signal when the switch should be cycling on and off. The dishwasher stops operation because it cannot confirm water is flowing correctly through the system.
Can I fix the E:26 error myself?
Some causes of E:26 are accessible to a knowledgeable DIYer. Inspecting and reseating the wiring harness connections and cleaning a debris-blocked water switch do not require specialized tools. However, testing mains voltage at the motor and replacing the water switch or wash motor involve working with line voltage components, which carries safety risks and is best handled by a qualified technician.
Is it safe to use my dishwasher while E:26 is active?
No. The E:26 code causes the dishwasher to halt its cycle because the control board cannot verify water flow status. Running the appliance without a functioning water switch could result in the motor running dry or water not being distributed correctly, potentially causing damage to internal components. The fault should be diagnosed and resolved before resuming use.
How much does it cost to repair a Jenn-Air dishwasher E:26 error?
Repair costs depend on the root cause. If only wiring repairs or cleaning are needed, costs may range from $50 to $150 for a service call. Replacing the water switch typically adds $30 to $80 in parts. If the wash motor has failed, parts and labor combined can range from $200 to $450 or more depending on the specific model and service rates in your area.
Will resetting the dishwasher clear the E:26 error?
A reset may temporarily clear the error code from the display, but it will not resolve the underlying fault. If the water switch, wiring, or motor issue is still present, the E:26 code will return as soon as the dishwasher attempts to run a cycle. A full diagnosis of the switch, wiring harness, and motor is necessary to permanently clear the fault.

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