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Error code reference

Jenn-Air Dishwasher Error Code E:03

Working relay for heater defective; appliance operates without heater.

Jenn-Air codesJenn-Air dishwasher codes

Working relay for heater defective; appliance operates without heater.

First step from the service manual

Replace the power module.

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

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What E:03 means on a Jenn-Air dishwasher

The E:03 error code on a Jenn-Air dishwasher indicates that the working relay responsible for controlling the heater circuit has been detected as defective. The power module, which houses this relay, monitors and controls the electrical switching that energizes the heating element during wash and dry cycles. When this relay fails, the control board logs the E:03 fault and the dishwasher continues to operate but without any heating function, meaning water will not reach proper wash temperatures and the drying cycle will be ineffective.

The heater relay is an electromechanical or solid-state switching component integrated into the power module assembly. Relay failure can occur due to contact welding from repeated high-current switching, contact oxidation or pitting, or internal coil failure. Because the relay is embedded within the power module rather than being a separately serviceable component, diagnostics focus on the module as a whole unit rather than attempting to isolate the relay independently.

The most direct consequence of this fault is that the appliance runs through its full cycle without heating the water. Wash performance will degrade noticeably, particularly for greasy loads, and dishes will exit the machine wet. The dishwasher does not shut down entirely, which makes the fault easy to overlook until wash results decline significantly. The prescribed first diagnostic step is direct replacement of the power module, as the relay is not a field-repairable component on its own.

Source: manufacturer service documentation.

Common causes of E:03

  1. 01

    Failed heater relay in the power module

    Part replacement

    The relay contacts inside the power module can weld shut, burn open, or oxidize after repeated switching cycles. This is the primary cause of E:03 and requires replacement of the entire power module assembly.

  2. 02

    Power module internal circuit failure

    Part replacement

    Beyond the relay itself, broader circuit failures within the power module can prevent the heater relay from receiving or passing the correct control signal. Replacing the power module addresses this at the component level.

  3. 03

    Intermittent electrical supply issue

    Wiring / connection

    Voltage fluctuations or poor connections at the power module's input terminals can stress the relay and trigger the fault. Inspect wiring harness connectors at the module for corrosion, looseness, or heat damage before condemning the module.

  4. 04

    Damaged wiring to the heater circuit

    Wiring / connection

    A short or open in the wiring between the power module and the heating element can place excessive load on the relay and cause it to fail. Inspect the heater wiring for chafing, burn marks, or broken conductors.

See the test procedure for each cause

Frequently asked questions about E:03

What does E:03 mean on a Jenn-Air dishwasher?
E:03 indicates that the working relay controlling the heater circuit inside the power module has been detected as defective. The dishwasher will continue to run its cycles but the heating element will not activate, so water will stay cold and dishes will not dry properly. Resolving this fault requires replacing the power module.
Can I fix the E:03 error myself or does it require a technician?
The repair involves replacing the power module, which requires disconnecting electrical connections inside the dishwasher. Technicians with appliance repair experience can perform this replacement, but due to the high-voltage components involved, homeowners without that background should hire a qualified technician. The faulty relay inside the module is not separately repairable in the field.
Is it safe to keep using my Jenn-Air dishwasher with the E:03 code active?
The dishwasher will continue to operate with E:03 active, and there is no immediate safety hazard from running it in this state. However, wash performance will be significantly reduced since the water will not heat to proper temperatures. Running the machine long-term without resolving the fault is not recommended, and any underlying wiring issues contributing to the relay failure should be ruled out promptly.
Will resetting the dishwasher clear the E:03 error code?
A power reset may temporarily clear the code from the display, but the fault will return once the control system re-evaluates the heater relay circuit during the next cycle. The underlying relay failure in the power module must be corrected through component replacement for the code to clear permanently.
How much does it typically cost to repair the E:03 error on a Jenn-Air dishwasher?
Repair costs vary depending on parts pricing and labor rates in your area. Power module replacement parts typically range from $80 to $200 or more depending on the specific model, and professional labor can add $100 to $250 to the total. Getting a diagnostic quote from a certified appliance technician before proceeding is advisable to confirm the module is the correct repair.

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