Maytag Dishwasher Error Code Delay LED + Heavy Wash LED

When the Delay LED and Heavy Wash LED light up together on a Maytag dishwasher, the machine has detected a thermistor failure during the Field Service Test. The thermistor is the temperature sensor that monitors water heat throughout the wash and dry cycles. This fault prevents the dishwasher from accurately regulating water temperature. A technician will need to run the Field Service Test and Manual Function Test to pinpoint the exact source of the failure.

Running the dishwasher with a failed thermistor is not recommended. Without a functioning temperature sensor, the control board cannot properly manage water heating, which may result in insufficient sanitization or overheating of the water and internal components. It is best to stop using the appliance until the fault is diagnosed and repaired.

A power reset may temporarily clear the displayed fault, but the error will return if the underlying thermistor problem has not been resolved. The fault is stored and detected during the Field Service Test, so simply resetting power does not fix the root cause. Proper diagnosis using the Field Service Test and Manual Function Test is necessary to confirm and address the actual failure.

A knowledgeable DIYer can inspect the thermistor wiring harness for visible damage, check that all connectors are firmly seated, and use a multimeter to test the thermistor's resistance. If the thermistor itself has failed, replacing it is a moderately straightforward repair. However, entering the Field Service Test and Manual Function Test modes requires familiarity with Maytag diagnostic procedures, so less experienced users may prefer to call a technician.

If only the thermistor needs replacement, parts typically cost in the range of $15 to $50, with professional labor adding $75 to $150 depending on your area. If the control board's input circuit has failed and the board requires replacement, total repair costs can range from $150 to $350 or more. Getting a diagnostic service call to confirm the failed component before purchasing parts is advisable.