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Error code reference

Cove Dishwasher Error Code 800186

MOT4 (drain pump motor)

Cove codesCove dishwasher codes

MOT4 (drain pump motor): Drain system is experiencing insufficient or poor draining.

First step from the service manual

Verify the drain is clear and free of debris.

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

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What 800186 means on a Cove dishwasher

Error code 800186 on a Cove dishwasher indicates a fault with the MOT4 drain pump motor, specifically that the drain system is not removing water efficiently or completely during the drain cycle. The dishwasher's control board monitors drain performance by tracking pump operation and water removal rate. When the system detects that draining is insufficient, it triggers this code to alert the user and halt continued operation that could result in water damage or incomplete washing cycles.

The drain pump motor (MOT4) is responsible for forcing wastewater out of the dishwasher tub and through the drain hose to the household drain connection. Insufficient draining can result from either a mechanical obstruction in the drain path or an electrical or mechanical failure within the pump motor itself. The two scenarios produce the same error code, so a systematic diagnostic approach starting with the physical drain path is essential before condemning the motor.

Common contributors to this fault include clogged filters, debris blockages in the drain hose or air gap, a kinked drain hose, or a failed drain pump motor that cannot generate adequate pressure to expel water. Because the first diagnostic step is confirming the drain path is clear and free of debris, technicians should inspect the filter assembly, drain sump, drain hose routing, and the connection at the disposal or drain inlet before testing the pump motor electrically.

Source: manufacturer service documentation.

Common causes of 800186

  1. 01

    Clogged drain filter or sump

    Wiring / connection

    Food debris and residue accumulate in the dishwasher filter and sump area over time, restricting water flow to the drain pump. Remove and clean the filter assembly and inspect the sump at the bottom of the tub for any debris buildup.

  2. 02

    Blocked or kinked drain hose

    Wiring / connection

    The drain hose can become kinked behind the unit or clogged with grease and debris, preventing water from exiting the tub. Inspect the full length of the drain hose from the pump outlet to the drain connection for obstructions or tight bends.

  3. 03

    Clogged air gap or garbage disposal connection

    Wiring / connection

    If the dishwasher drains through a countertop air gap or into a garbage disposal, blockages at those connection points can back up the drain line. Clean the air gap cap and check that the disposal knockout plug has been removed and the inlet is clear.

  4. 04

    Failed drain pump motor (MOT4)

    Part replacement

    If the drain path is verified clear and the error persists, the MOT4 drain pump motor itself may have failed mechanically or electrically and is unable to generate sufficient pressure to drain the tub. The motor will need to be tested and likely replaced.

  5. 05

    Drain pump impeller obstruction

    Wiring / connection

    Small hard objects such as glass chips, fruit pits, or broken utensil pieces can lodge in the pump impeller, preventing it from spinning freely even when the motor is functional. Access to the pump is required to inspect and clear the impeller.

See the test procedure for each cause

Frequently asked questions about 800186

What does 800186 mean on a Cove dishwasher?
Error code 800186 on a Cove dishwasher indicates that the drain pump motor, identified internally as MOT4, is detecting insufficient or poor draining from the dishwasher tub. The control board has determined that water is not being removed adequately during the drain cycle. This can be caused by a blockage in the drain path or a failure of the drain pump motor itself.
How do I fix error code 800186 on my Cove dishwasher?
Start by cleaning the dishwasher filter and inspecting the sump area for debris. Next, check the drain hose for kinks or clogs and verify the air gap or garbage disposal connection is clear. If the drain path is unobstructed and the error continues, the MOT4 drain pump motor may need to be tested and replaced by a qualified technician.
Is it safe to run my Cove dishwasher when error 800186 is showing?
It is not recommended to continue running the dishwasher while this error is active. Insufficient draining means standing water may remain in the tub, which can lead to unsanitary conditions, water damage, and additional strain on the pump motor. Address the underlying cause before resuming normal use.
Will resetting my Cove dishwasher clear error code 800186?
Resetting the dishwasher may temporarily clear the error code from the display, but the code will return if the underlying drain issue has not been resolved. The fault is triggered by an actual draining performance problem, so a reset alone is not a fix. Diagnose and correct the cause before attempting to reset.
How much does it cost to repair error 800186 on a Cove dishwasher?
If the fix is a simple drain cleaning or hose adjustment, costs may be minimal, primarily covering your time or a basic service call fee ranging from around $75 to $150. If the MOT4 drain pump motor requires replacement, parts and labor combined can range from approximately $150 to $400 or more depending on your location and service provider.

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