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Error code reference

Cove Dishwasher Error Code 100179

MHP Temperature Sensors High Gradient (Fault)

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MHP Temperature Sensors High Gradient (Fault) — triggers when the heater is ON without proper hydraulic conditions (e.g., no water or wash pump is off).

First step from the service manual

Verify water is present in the sump and wash pump is running when the heater is on; check for scaling.

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
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What 100179 means on a Cove dishwasher

Error code 100179 on a Cove dishwasher indicates a MHP (Main Heater Protection) Temperature Sensors High Gradient fault. This fault triggers when the control system detects that the heating element is energized but the surrounding hydraulic conditions are not adequate to safely dissipate that heat. Specifically, the sensors measure the rate of temperature rise across the heater assembly, and if that rise is too steep, the system concludes that the heater is operating without sufficient water contact, such as when the sump is dry or the wash pump is not circulating water over the element.

The wash pump and heater are designed to operate together during heated wash and rinse cycles. When the pump is running correctly, water flows continuously over the heating element, keeping temperatures within safe operating limits. If the pump fails, loses prime, or if the sump does not have adequate water due to a fill issue, the heater can experience a rapid, uncontrolled temperature spike. The high gradient fault is the control board's thermal protection response to that scenario, shutting down the heater before damage occurs.

Scaling is a secondary but important cause. Heavy mineral deposits on the heating element act as an insulating layer, trapping heat at the element surface even when water is present and the pump is running normally. Over time, this can produce a localized temperature gradient steep enough to trigger the fault. Inspecting the element and sump for limescale buildup, confirming proper water fill levels, and verifying wash pump operation are the core diagnostic priorities for this code.

Source: manufacturer service documentation.

Common causes of 100179

  1. 01

    Wash pump not running during heat cycle

    Part replacement

    If the wash pump motor fails or loses prime, water stops circulating over the heater, causing a rapid temperature rise. Listen for the pump during operation and check for error codes or seized motor conditions.

  2. 02

    Insufficient water in the sump

    Wiring / connection

    A failed inlet valve, kinked supply line, or low water pressure can leave the sump without enough water to cover the heater. Check that the dishwasher is filling to the correct level at the start of the wash cycle.

  3. 03

    Heavy limescale on the heating element

    Wiring / connection

    Mineral deposits coat the heater surface and act as insulation, trapping heat and producing a steep temperature gradient even when water is present. Visually inspect the element for white or chalky buildup.

  4. 04

    Faulty MHP temperature sensor

    Part replacement

    A sensor that reads incorrectly high can report a temperature gradient that does not actually exist. If water fill and pump operation check out normally, the sensor itself may need to be tested or replaced.

  5. 05

    Control board relay fault

    Part replacement

    A stuck or faulty relay on the control board could energize the heater at the wrong point in the cycle, before the pump is activated. This is less common but should be considered after ruling out hydraulic causes.

See the test procedure for each cause

Frequently asked questions about 100179

What does 100179 mean on a Cove dishwasher?
Error code 100179 is a MHP Temperature Sensors High Gradient fault. It means the dishwasher's control system detected that the heating element was active but the temperature was rising too rapidly, indicating the heater was running without proper water circulation or adequate water in the sump. The dishwasher shuts down the heater automatically to prevent damage.
Can I fix error code 100179 myself?
Some causes are DIY-friendly. Start by checking that the dishwasher is filling with water completely and that you can hear the wash pump running during the cycle. If scaling is visible on the heating element, descaling the unit may resolve the fault. However, if the pump motor or a temperature sensor has failed, those repairs typically require replacing parts and may benefit from a qualified technician.
Is it safe to keep using my Cove dishwasher when error 100179 appears?
You should not continue running the dishwasher while this fault is active. The error indicates the heater may be operating without adequate water contact, which can damage the heating element, surrounding components, or in extreme cases create a hazard. Diagnose and resolve the underlying cause before resuming normal use.
Will resetting the dishwasher clear error code 100179?
A reset may clear the code temporarily, but if the underlying condition persists, such as a pump not running or a low water fill, the fault will return. Resetting without addressing the root cause risks repeated shutdowns and potential component damage. Always identify and correct the cause before relying on a reset.
How much does it cost to repair a Cove dishwasher showing error 100179?
Repair costs vary depending on what failed. Descaling or adjusting the water supply involves little to no parts cost. Replacing a wash pump motor typically runs in the range of $150 to $400 including labor, while a temperature sensor replacement is generally less expensive, often $75 to $200. Control board replacement, if needed, can range from $300 to $600 or more depending on parts and labor rates in your area.

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