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Error code reference

Dacor Range Oven Cooktop Error Code HO

Millennia Dishwasher

Dacor codesDacor range oven cooktop codes

Millennia Dishwasher: Water heating delay.

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What HO means on a Dacor range oven cooktop

The HO error code on a Dacor Millennia Dishwasher indicates a water heating delay condition. Despite this error code appearing in documentation associated with Dacor ranges, ovens, and cooktops, the HO code is specifically tied to the Millennia Dishwasher platform and relates to the appliance's inability to heat water to the required temperature within an expected timeframe during a wash cycle. The control board monitors water temperature throughout the cycle and triggers this code when heating progress falls behind the programmed schedule.

The water heating system in the Millennia Dishwasher relies on a heating element, a water temperature sensor or thermistor, and the control board working together to bring water to the correct wash temperature. If the thermistor reads a temperature that is not rising at the expected rate, the control interprets this as a heating delay and displays HO. This can result from a weak or failed heating element, a faulty thermistor providing inaccurate temperature readings, or insufficient water fill levels that reduce heating efficiency.

Additional contributing factors include low incoming water temperature, particularly in cold climates during winter months, or a control board that is not delivering the correct voltage to the heating element. Diagnosing this code requires checking the heating element for continuity, testing the thermistor resistance against specification, and confirming adequate water supply and fill volume in the tub before cycling begins.

Source: manufacturer service documentation.

Common causes of HO

  1. 01

    Failed or weak heating element

    Part replacement

    The heating element may have lost continuity or be producing insufficient heat output. Check the element for visible damage and test it for continuity with a multimeter.

  2. 02

    Faulty water temperature thermistor

    Part replacement

    If the thermistor is reading temperatures inaccurately, the control board may incorrectly determine that water heating is delayed even when the element is functioning. Test thermistor resistance and compare against specification.

  3. 03

    Low incoming water temperature

    Wiring / connection

    Very cold supply water, common in winter or in homes with long pipe runs, can cause the heating system to fall behind the programmed heating schedule. Running hot water at the nearest faucet before starting a cycle can help confirm this as the cause.

  4. 04

    Insufficient water fill in the tub

    Wiring / connection

    If the dishwasher is not filling to the correct water level, there is less water volume for the element to heat efficiently, extending the time required and triggering the delay code. Check inlet valve function and water fill level.

  5. 05

    Control board fault

    Part replacement

    A faulty control board may fail to deliver proper voltage to the heating element, causing actual heating delay even if the element itself tests good. This is typically diagnosed after ruling out all other components.

See the test procedure for each cause

Frequently asked questions about HO

What does HO mean on a Dacor range, oven, cooktop?
The HO code on Dacor appliances is specifically associated with the Millennia Dishwasher and indicates a water heating delay condition. It means the dishwasher's control system has detected that water is not reaching the required temperature within the expected timeframe during a wash cycle. Common causes include a failing heating element, a faulty thermistor, or low incoming water temperature.
Can I fix the HO error on my Dacor Millennia Dishwasher myself?
Some causes of the HO code are DIY-friendly, such as running hot water before starting a cycle to raise the incoming water temperature or checking that the dishwasher is filling properly. Testing and replacing the heating element or thermistor requires basic electrical testing skills and a multimeter. Control board replacement is more complex and may warrant professional service.
Is the HO error on a Dacor dishwasher a safety concern?
The HO code is not typically a safety emergency, but it does indicate the dishwasher is not operating correctly and may not be sanitizing dishes effectively due to insufficient water temperature. You should avoid running the appliance repeatedly through full cycles until the underlying cause is identified and corrected.
How much does it cost to repair the HO error on a Dacor Millennia Dishwasher?
Repair costs vary depending on the faulty component. A replacement heating element typically costs between $30 and $80 for the part, while a thermistor may run $15 to $50. Control board replacement is the most expensive option, often ranging from $150 to $350 or more for the part alone, with additional labor costs if a technician is needed.
Will resetting my Dacor Millennia Dishwasher clear the HO error code?
Resetting the dishwasher by cutting power at the breaker for several minutes may temporarily clear the HO code, but the code will return if the underlying issue is not resolved. A reset is useful for ruling out a one-time control glitch, but persistent HO errors require actual diagnosis and repair of the heating element, thermistor, or related components.

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