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Error code reference

Midea Dryer Error Code E4

Humidity sensor detecting circuit (circuit and components) on the main control board is damaged.

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Humidity sensor detecting circuit (circuit and components) on the main control board is damaged.

First step from the service manual

Control will run whole cycle without fault using timed drying instead of humidity sensor; error code is logged at end of cycle if EEPROM is available or displayed at end of cycle.

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

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  • Wiring diagram references and connector pinouts from the OEM service manual
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What E4 means on a Midea dryer

The E4 error code on a Midea dryer indicates a fault within the humidity sensor detecting circuit located on the main control board. This circuit is responsible for reading the moisture level of the load inside the drum through sensor bars, then using that data to determine when the laundry has reached the target dryness level. When the control board's internal circuitry for processing humidity sensor signals is damaged or non-functional, the board can no longer interpret incoming sensor data accurately.

A key characteristic of this fault is how the dryer handles it during operation. Rather than stopping mid-cycle, the control will complete the full drying cycle using timed drying mode as a fallback. The E4 code is then either logged to EEPROM memory or displayed at the end of the cycle, depending on the unit's configuration. This behavior means the dryer remains usable, but automatic moisture-sensing dryness control is disabled until the fault is resolved.

Because the fault is specifically attributed to the detecting circuit on the main control board itself, rather than the sensor bars or their wiring, the root cause typically points to board-level component damage. This can include failed capacitors, damaged signal processing components, or corroded circuit traces on the board. Physical damage from moisture, power surges, or manufacturing defects can all compromise this circuit. In most cases, resolving E4 requires replacing or repairing the main control board.

Source: manufacturer service documentation.

Common causes of E4

  1. 01

    Damaged main control board humidity circuit

    Part replacement

    The detecting circuit on the main control board responsible for processing humidity sensor signals has failed. This is the primary cause indicated by E4, often due to component failure, power surges, or moisture intrusion on the board.

  2. 02

    Corroded or burnt circuit traces on the control board

    Part replacement

    Physical damage to the board's copper traces or solder joints in the humidity sensing circuit can disrupt signal continuity. Inspect the board closely for visible burn marks, corrosion, or cracked solder joints near the sensor circuit area.

  3. 03

    Moisture or condensation damage to the control board

    Part replacement

    Water or condensation reaching the control board can short circuit the humidity sensing components. Check for signs of water staining or residue on the board surface.

  4. 04

    Power surge damage to board components

    Part replacement

    A voltage spike can destroy sensitive signal processing components within the humidity detecting circuit. If the error appeared after a power outage or surge event, board damage is a strong possibility.

See the test procedure for each cause

Frequently asked questions about E4

What does E4 mean on a Midea dryer?
The E4 code means the humidity sensor detecting circuit on the main control board is damaged. This circuit reads moisture levels in the drum to determine when clothes are dry. The dryer will still complete cycles using timed drying as a fallback, but the automatic moisture-sensing function is disabled. The code is displayed or logged at the end of the cycle rather than interrupting it.
Can I still use my Midea dryer while it shows the E4 code?
Yes, the dryer will continue to operate using timed drying mode even when E4 is present. Your laundry will still be dried, but the dryer will not automatically stop based on moisture detection. You will need to select your drying time manually and may need to check clothes to avoid over-drying or under-drying.
Will resetting my Midea dryer clear the E4 error code?
A reset will not permanently clear E4 because the fault is tied to physical damage in the humidity sensing circuit on the main control board. The code will return at the end of the next cycle since the underlying hardware issue has not been resolved. Clearing the error requires repairing or replacing the main control board.
Is it safe to keep running my dryer with the E4 error?
Running the dryer with an E4 error is generally safe for continued use since the machine falls back to timed drying mode. However, without moisture sensing, there is a greater chance of over-drying fabrics, which can cause wear over time. It is best to address the control board fault when possible to restore full functionality.
How much does it cost to fix a Midea dryer E4 error?
Repair costs depend on whether the main control board needs full replacement or can be repaired at the component level. A replacement control board typically costs anywhere from $80 to $200 or more for the part alone. Adding professional labor, total repair costs can range from $150 to $350 or higher depending on your location and service provider.

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