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Error code reference

Jenn-Air Dishwasher Error Code E:33

Heat pump detects too low water level in pump sump; heat exchanger valve leaky.

Jenn-Air codesJenn-Air dishwasher codes

Heat pump detects too low water level in pump sump; heat exchanger valve leaky.

First step from the service manual

Check if bowls/pans are overturned in the appliance. Low voltage - no appliance fault.

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

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
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What E:33 means on a Jenn-Air dishwasher

Error code E:33 on a Jenn-Air dishwasher indicates that the heat pump system has detected a water level that is too low in the pump sump during a wash or heat cycle. The heat pump relies on adequate water volume in the sump to function safely and efficiently. When the water level drops below the minimum threshold the heat pump sensor expects, the control board triggers E:33 to protect the heat exchanger and pump components from running dry or overheating.

The two primary causes identified for this fault are a leaky heat exchanger valve and insufficient water pooling in the sump due to improperly loaded items. A faulty or degraded heat exchanger valve can allow water to drain or bypass the sump area continuously, preventing the system from maintaining the correct water level. This is a component-level failure that requires inspection of the valve for visible damage, improper seating, or seal degradation.

Before assuming a component failure, the first diagnostic step is to check the dish rack loading. Inverted bowls, pans, or deep containers can collect and trap water during the fill cycle, effectively stealing volume from the sump and triggering a false low-water condition. Low supply voltage to the appliance can also contribute to this fault without any actual internal component failure. Confirming that line voltage is within the correct range rules out an electrical supply issue before proceeding with mechanical or component-level diagnostics.

Source: manufacturer service documentation.

Common causes of E:33

  1. 01

    Overturned bowls or pans blocking water

    Wiring / connection

    Inverted cookware or deep bowls can pool water during the fill cycle, reducing the water level in the pump sump below the required threshold. Rearrange the dish rack so all concave items are angled to drain properly.

  2. 02

    Leaky heat exchanger valve

    Part replacement

    A degraded or improperly seated heat exchanger valve can allow water to bypass or drain away from the sump continuously during the cycle. Inspect the valve for seal damage, cracks, or failure to close fully.

  3. 03

    Low supply voltage

    Wiring / connection

    If the incoming line voltage to the dishwasher is below the required level, the heat pump and water level sensor may not operate correctly, generating a false E:33 fault with no actual component failure. Measure voltage at the outlet or junction box to rule this out.

  4. 04

    Heat pump sump sensor fault

    Part replacement

    If the water level sensor in the pump sump is malfunctioning or has accumulated debris, it may report a low water condition even when adequate water is present. Inspect the sensor for buildup or damage.

  5. 05

    Sump area clog or drain leak

    Wiring / connection

    A partial blockage or leak in the sump area can prevent water from accumulating to the correct level. Inspect the sump, filters, and surrounding hose connections for debris or visible water leakage.

See the test procedure for each cause

Frequently asked questions about E:33

What does E:33 mean on a Jenn-Air dishwasher?
E:33 means the heat pump has detected a water level that is too low in the pump sump. This can be caused by a leaky heat exchanger valve that is not retaining water properly, or by cookware loaded upside down that is trapping water and reducing the available sump volume. Low supply voltage can also trigger this code without any fault in the appliance itself.
How do I fix error code E:33 on my Jenn-Air dishwasher?
Start by checking the dish rack for overturned bowls, pans, or containers that may be collecting water. Rearrange the load so all items drain downward, then run a new cycle to see if the error clears. If the code returns, check your home's supply voltage and inspect the heat exchanger valve for leaks or seal failure. A faulty valve will need to be replaced to resolve the fault.
Is it safe to keep using my dishwasher when E:33 is displayed?
You should not continue running the dishwasher while E:33 is active. A low water level in the pump sump can cause the heat pump and associated components to run without adequate water, which risks overheating and further damage. Address the cause of the fault before resuming normal use.
Will resetting my Jenn-Air dishwasher clear the E:33 error?
A reset may temporarily clear the E:33 code, but if the underlying cause such as a leaky heat exchanger valve or an improperly loaded rack is not corrected, the error will return during the next cycle. Fix the root cause first, then reset the appliance for the change to hold.
How much does it cost to repair an E:33 error on a Jenn-Air dishwasher?
If the fix is simply rearranging the dish rack or addressing a voltage issue, there is no parts cost involved. If the heat exchanger valve requires replacement, repair costs including parts and labor typically range from $150 to $350 depending on your location and the specific valve required. Diagnosing the fault accurately before ordering parts will help avoid unnecessary expenses.

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