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Error code reference

Daewoo Washer Error Code H8

Heater wash overheating error

Daewoo codesDaewoo washer codes

Heater wash overheating error – the heater operated without water in the tub.

First step from the service manual

Check the water level and the heater wash.

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 H8 means on a Daewoo washer

The H8 error code on a Daewoo washer indicates a heater wash overheating fault. This error is triggered when the wash heater element activates and operates without a sufficient water level present in the tub. The control board monitors heater activity in relation to water presence, and when the heater runs dry, temperatures can rise rapidly to unsafe levels, causing the system to shut down and display this fault code to prevent damage to the heater element and surrounding components.

The most likely root causes involve problems with water intake or water level detection. If the washer fails to fill properly due to a clogged inlet valve, low water pressure, or a kinked supply hose, the tub may not reach the minimum required level before the heater activates. A faulty pressure switch or water level sensor can also incorrectly signal to the control board that adequate water is present when it is not, allowing the heater to energize in a dry or near-dry tub.

Diagnostic work should begin by confirming the water supply is fully open and that the machine is filling to the correct level before the heating cycle begins. Inspecting the pressure switch hose for blockages or cracks, testing the inlet valve for proper operation, and checking the heater element itself for continuity and signs of scaling or physical damage are all appropriate next steps. The heater element and its associated thermostat or thermal cutout should also be checked if overheating is suspected to have caused secondary component failure.

Source: manufacturer service documentation.

Common causes of H8

  1. 01

    Insufficient water fill before heating cycle

    Wiring / connection

    If the washer does not fill to the required level before the heater activates, the element runs without adequate water. Check that water supply valves are fully open and that inlet hoses are not kinked or restricted.

  2. 02

    Faulty water level pressure switch

    Part replacement

    A defective pressure switch can send an incorrect signal to the control board indicating the tub is full when it is not, causing the heater to activate prematurely. Inspect the pressure switch hose for blockages or cracks and test the switch itself for proper function.

  3. 03

    Clogged or failed water inlet valve

    Part replacement

    A partially or fully blocked inlet valve will prevent the tub from filling correctly before the heating stage begins. Check for debris in the inlet valve screen and test the valve solenoid for proper operation.

  4. 04

    Faulty heater element or thermal cutout

    Part replacement

    A heater element that activates outside of normal control parameters, or a thermal cutout that has failed in a closed position, can contribute to overheating conditions. Test the heater element for continuity and inspect its thermal protection components.

  5. 05

    Control board malfunction

    Part replacement

    If the main control board is sending incorrect signals to the heater relay or misreading sensor inputs, it may activate the heater at the wrong time in the cycle. This is a less common cause and should be considered after all sensors and mechanical components have been ruled out.

See the test procedure for each cause

Frequently asked questions about H8

What does H8 mean on a Daewoo washer?
The H8 code on a Daewoo washer means the wash heater operated without water present in the tub, which is classified as a heater overheating fault. The machine detected an unsafe condition and shut down to protect internal components. This error points to a problem with water filling, water level sensing, or heater control.
Can I fix the H8 error on my Daewoo washer myself?
Some causes of the H8 error are accessible to a knowledgeable DIYer. Checking that water supply valves are open, inspecting inlet hoses for kinks, and cleaning the inlet valve screen are straightforward tasks. Testing the pressure switch, heater element, and control board typically requires a multimeter and some technical comfort, so those steps may be better suited to a trained technician.
Is it safe to keep using my Daewoo washer when the H8 code is showing?
No, you should not continue running the washer while the H8 code is active. The error indicates the heater element may be activating without water, which can cause the element to burn out and potentially damage surrounding components. The machine should remain out of service until the underlying cause is identified and corrected.
Will resetting my Daewoo washer clear the H8 error code?
A power reset may temporarily clear the H8 code, but if the underlying fault is not repaired, the error will return once the washer reaches the heating stage of the cycle again. Resetting the machine without addressing the root cause is not a fix and may allow repeated overheating events that worsen component damage.
How much does it cost to repair a Daewoo washer with the H8 error?
Repair costs vary depending on which component has failed. Replacing a water inlet valve or pressure switch typically ranges from around $50 to $150 in parts and labor. A heater element replacement can fall in the $100 to $250 range, while a control board replacement may cost $150 to $350 or more depending on parts availability and local labor rates.

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