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Error code reference

Jenn-Air Dishwasher Error Code E:18

Water supply rate too low according to flow sensor or no water supply; wait for supply then programme stops…

Jenn-Air codesJenn-Air dishwasher codes

Water supply rate too low according to flow sensor or no water supply; wait for supply then programme stops with draining.

First step from the service manual

Check water supply.

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

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What E:18 means on a Jenn-Air dishwasher

The E:18 error code on a Jenn-Air dishwasher indicates that the flow sensor has detected an insufficient water supply rate during the fill cycle. The dishwasher monitors incoming water volume through a flow sensor, which measures how much water enters the tub within a set timeframe. When the actual flow rate falls below the expected threshold, or when no water enters at all, the control board registers this fault. The appliance is designed to pause and wait for adequate water supply before continuing, and if supply is not restored, the cycle will terminate with a drain sequence.

The flow sensor itself is a key component in this diagnostic. It tracks water movement into the unit and reports back to the control board. If the sensor reads low flow, the cause may be external (restricted water supply) or internal (a faulty sensor, a kinked inlet hose, or a clogged inlet valve screen). Low household water pressure can also trigger this code, even when the supply valve is fully open.

Because the dishwasher initiates a drain before stopping, any water that did enter the tub will be expelled before the cycle ends. This behavior is a protective measure to prevent incomplete wash cycles and potential overflow conditions. Resolving E:18 typically starts with verifying that the household water supply valve behind or beneath the dishwasher is fully open and that water pressure at the point of connection is adequate.

Source: manufacturer service documentation.

Common causes of E:18

  1. 01

    Closed or partially closed supply valve

    Wiring / connection

    The shut-off valve behind or beneath the dishwasher may be fully or partially closed, restricting water flow. Locate the valve and confirm it is turned completely to the open position.

  2. 02

    Kinked or pinched inlet hose

    Wiring / connection

    The water inlet hose connecting the supply valve to the dishwasher may be kinked or compressed, reducing flow to a level the sensor flags as insufficient. Pull the dishwasher out slightly and inspect the hose routing.

  3. 03

    Clogged water inlet valve screen

    Part replacement

    A fine mesh screen inside the water inlet valve can become blocked with sediment or mineral deposits over time, restricting incoming flow. The screen can sometimes be cleaned, but a heavily corroded or damaged inlet valve will need replacement.

  4. 04

    Low household water pressure

    Wiring / connection

    If overall water pressure in the home is low due to municipal supply issues, a pressure-reducing valve setting, or high simultaneous demand from other fixtures, the dishwasher may not receive adequate flow. Check pressure at a nearby faucet as a quick comparison.

  5. 05

    Faulty flow sensor

    Part replacement

    If the water supply and inlet valve are confirmed to be functioning correctly, the flow sensor itself may be sending inaccurate readings to the control board. A defective sensor will need to be replaced to resolve the code.

See the test procedure for each cause

Frequently asked questions about E:18

What does E:18 mean on a Jenn-Air dishwasher?
E:18 means the dishwasher's flow sensor detected that water is entering the tub too slowly or not at all. The control board monitors fill rate during each cycle, and when incoming water falls below the required threshold, this code is triggered. The dishwasher will wait briefly for supply to normalize, and if it does not, the unit will drain and stop the cycle.
How do I fix the E:18 error on my Jenn-Air dishwasher?
Start by confirming the water supply valve is fully open and that the inlet hose is not kinked. Next, check whether your home's water pressure is normal by running a nearby faucet. If supply and pressure are fine, inspect or clean the inlet valve screen for sediment buildup. If those steps do not resolve the code, the inlet valve or flow sensor may need to be replaced.
Will resetting my Jenn-Air dishwasher clear the E:18 code?
A reset may temporarily clear the code, but it will return if the underlying cause is not addressed. To reset, turn off power to the dishwasher at the circuit breaker for a few minutes, then restore power. If the water supply issue has been corrected, the code should not reappear on the next cycle.
Is it safe to continue using my dishwasher when E:18 is displayed?
The dishwasher will not complete a wash cycle while E:18 is active, so there is no functional risk in attempting another cycle after checking the supply. However, repeated failed fill attempts can put unnecessary strain on the inlet valve over time. Address the root cause before running regular cycles.
How much does it cost to repair a Jenn-Air dishwasher showing E:18?
If the fix is as simple as opening the supply valve or straightening a kinked hose, there is no parts cost involved. Replacing a water inlet valve typically costs between $30 and $80 for the part, with labor adding $100 to $200 depending on your area. A flow sensor replacement is in a similar range, and a full diagnosis by a technician usually runs $75 to $150 before any repairs are made.

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