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Error code reference

Haier Washer Error Code Err4

Heating fault

Haier codesHaier washer codes

Heating fault – the temperature does not go up during heating; heating element issue.

First step from the service manual

Check whether the heating element is well linked.

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
  • Verified part numbers when replacement is required
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What Err4 means on a Haier washer

Err4 on a Haier washer indicates a heating fault, specifically that the water temperature is not rising during a wash or rinse cycle that requires heating. The washer's control board monitors temperature feedback during the heating phase, and when it determines that the temperature has not increased to the expected level within a set timeframe, it triggers Err4 and halts the cycle. The primary component involved is the heating element, which is responsible for warming the water inside the drum to the target temperature.

The most direct cause of this error is a failure in the heating element itself, either due to a burnt-out element, a broken internal coil, or a poor electrical connection at the element terminals. The first diagnostic step is to verify that the heating element is properly connected, as loose wiring or corroded terminals can interrupt the circuit and prevent any heat output. Beyond the connection check, the element's resistance should be tested with a multimeter to confirm it is within the correct operating range.

Additional causes can include a faulty temperature sensor or NTC thermistor that provides inaccurate readings to the control board, causing the board to incorrectly conclude that heating is not occurring. Wiring harness damage between the control board and the heating element, or a defective control board that fails to send proper voltage to the element, can also produce this fault. Addressing Err4 requires systematic electrical testing of each component in the heating circuit before replacing parts.

Source: manufacturer service documentation.

Common causes of Err4

  1. 01

    Faulty or burnt-out heating element

    Part replacement

    The heating element itself may have failed internally, breaking the circuit needed to generate heat. Testing the element with a multimeter for continuity or correct resistance will confirm whether it has burnt out.

  2. 02

    Loose or corroded heating element connections

    Wiring / connection

    Poor electrical contact at the heating element terminals can prevent the element from receiving power even if the element itself is functional. Inspecting and reseating the wiring connectors at the element is the recommended first step.

  3. 03

    Defective temperature sensor or NTC thermistor

    Part replacement

    If the temperature sensor is faulty, it may report incorrect temperature data to the control board, causing the board to register a heating failure even when the element is working. The sensor can be tested for correct resistance values across a temperature range.

  4. 04

    Damaged wiring harness in the heating circuit

    Wiring / connection

    Breaks, shorts, or chafed insulation in the wiring between the control board and the heating element can interrupt power delivery to the element. A visual inspection along the harness route and continuity testing of individual wires will identify this issue.

  5. 05

    Defective control board

    Part replacement

    If the control board is not sending the correct voltage output to the heating element, the element will not activate regardless of its condition. This is the least common cause and should only be considered after the element, sensor, and wiring have been ruled out.

See the test procedure for each cause

Frequently asked questions about Err4

What does Err4 mean on a Haier washer?
Err4 on a Haier washer means a heating fault has been detected, specifically that the water temperature did not rise during a cycle phase that requires heating. The control board monitors the heating process and triggers this code when no temperature increase is detected within the expected timeframe. The heating element and its connections are the primary components to inspect first.
Can I fix Err4 on my Haier washer myself?
Some causes of Err4 are accessible to a knowledgeable DIYer, such as checking and reseating loose wiring connections at the heating element. However, testing the heating element for correct resistance, checking the temperature sensor, and diagnosing wiring harness issues require a multimeter and comfort working with internal washer components. If you are not experienced with electrical appliance repair, a qualified technician should perform these checks.
Is it safe to keep using my Haier washer when Err4 appears?
When Err4 is active, the washer will generally stop the cycle because the heating requirement is not being met, which limits the risk of running the machine in a dangerous state. However, continuing to attempt cycles without resolving the underlying fault is not recommended, as it can place additional stress on the control board and connected components. The issue should be diagnosed and repaired before regular use resumes.
Will resetting my Haier washer clear the Err4 code?
A reset may temporarily clear the Err4 code from the display, but the error will return as soon as the washer attempts to heat water again if the underlying fault has not been repaired. Resetting is useful for confirming whether the fault is intermittent, such as from a loose connection that reseats itself, but it is not a permanent solution. The heating element, connections, and sensor must be inspected and tested to resolve the fault properly.
How much does it cost to repair Err4 on a Haier washer?
Repair costs depend on which component has failed. A replacement heating element typically ranges in cost from around $20 to $80 for the part alone, while a temperature sensor is generally in the $10 to $40 range. If professional labor is required, total repair costs including parts and labor can range from roughly $100 to $250 depending on the technician's rates and the extent of the fault.

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