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Error code reference

Cove Dishwasher Error Code 200128

HTR1 is in a runaway heat condition.

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HTR1 is in a runaway heat condition.

First step from the service manual

Let the unit cool down and retest.

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 200128 means on a Cove dishwasher

Error code 200128 on a Cove dishwasher indicates that HTR1, the primary heating element or heater circuit, has entered a runaway heat condition. This means the control board is detecting that the heater is generating or sustaining heat beyond its expected operating parameters, without the normal regulation or shutoff occurring as designed. The heater is not cycling off appropriately, which can result from a failure in the temperature sensing circuit, the heater relay, or the heating element itself.

A runaway heat condition is a safety-relevant fault. The control system monitors water or air temperature through one or more thermistors or thermal sensors. If the sensor fails or reports an incorrect reading, the board may continue energizing HTR1 past the safe threshold. Alternatively, if the relay controlling HTR1 welds closed, the heater receives continuous power regardless of what the control board commands, producing the same runaway behavior.

The first diagnostic step is to power down the dishwasher and allow the unit to cool completely before retesting. This rules out a temporary overheat event caused by a blocked spray arm, low water fill, or a brief sensor anomaly. If the error returns after a full cool-down and retest cycle, further diagnosis of the HTR1 relay, the associated temperature sensor, and the control board is required.

Source: manufacturer service documentation.

Common causes of 200128

  1. 01

    HTR1 relay welded closed

    Part replacement

    If the relay on the control board that powers HTR1 welds in the closed position, the heater receives continuous power and cannot be shut off by the board. This requires inspecting or replacing the control board.

  2. 02

    Failed or drifted temperature sensor

    Part replacement

    A faulty thermistor or thermal sensor may report incorrect temperature data to the control board, causing the board to keep energizing HTR1 past safe limits. Check the sensor for correct resistance values at a known temperature.

  3. 03

    Low water fill during a heated cycle

    Wiring / connection

    If the dishwasher did not fill with enough water, the heating element can overheat the small volume of water or heat air directly, triggering a runaway condition. Check water inlet components and fill levels.

  4. 04

    Blocked spray arm or restricted water circulation

    Wiring / connection

    Poor water circulation caused by a clogged spray arm or filter can concentrate heat in one area and cause localized overheating that the system interprets as a runaway condition. Clean the spray arms and filters and retest.

  5. 05

    Control board failure

    Part replacement

    A broader failure of the control board may cause it to improperly manage the HTR1 circuit, either by misreading sensor inputs or by losing the ability to de-energize the heater relay. This is typically diagnosed after ruling out the sensor and relay independently.

See the test procedure for each cause

Frequently asked questions about 200128

What does 200128 mean on a Cove dishwasher?
Error code 200128 means the dishwasher has detected a runaway heat condition in HTR1, the primary heater circuit. The heater is running beyond its expected temperature limits without shutting off as designed. The machine stops operation as a safety measure to prevent damage or hazard. Allowing the unit to cool fully and retesting is the recommended first step.
Will resetting my Cove dishwasher clear error code 200128?
A reset or cool-down period may clear the error temporarily if the cause was a one-time event such as a low water fill or a momentary sensor anomaly. However, if an underlying component like the HTR1 relay or temperature sensor has failed, the code will return once the unit is run again. A lasting fix requires identifying and correcting the root cause.
Is it safe to use my Cove dishwasher when error code 200128 is displayed?
You should not continue running the dishwasher while this error is active. A runaway heat condition means the heater is not being controlled properly, which poses a risk of damage to internal components and potentially to the surrounding cabinetry or countertop. Let the unit cool completely and do not run a cycle until the fault has been diagnosed and resolved.
How do I fix error code 200128 on a Cove dishwasher?
Start by powering off the unit and letting it cool fully, then retest. If the error returns, the most common causes are a welded HTR1 relay on the control board, a failed temperature sensor, or insufficient water fill. Inspect the temperature sensor for correct resistance readings and check that the dishwasher is filling with an adequate amount of water. If those components test correctly, the control board may need to be evaluated or replaced.
How much does it cost to repair a Cove dishwasher showing error code 200128?
Repair costs depend on which component has failed. A temperature sensor replacement is typically a lower-cost repair, often in the range of $50 to $150 for parts and labor. A control board replacement is more involved and can range from $200 to $500 or more depending on parts availability and labor rates in your area. Getting a diagnostic service call from a qualified technician will help identify the specific failed component before committing to a repair.

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