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Error code reference

ADC Washer Error Code E4

Water inlet fault

ADC codesADC washer codes

Water inlet fault — despite activating the corresponding solenoid valve outputs, the water level inside the tub has not increased during a pre-established period of time.

First step from the service manual

Press START to continue the program, or press ESC to end the program.

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

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What E4 means on a ADC washer

The E4 error code on an ADC washer indicates a water inlet fault. Specifically, the control board has activated the solenoid valve output or outputs responsible for filling the tub, but after a pre-established monitoring period, the water level sensor has not detected any meaningful rise in water level. The machine is designed to expect a measurable increase in water level within a set timeframe once the fill command is issued. When that condition is not met, E4 is triggered and the cycle is interrupted.

The components involved in this fault include the water inlet solenoid valve or valves, the water supply lines and inlet screens, the pressure switch or water level sensor, and the wiring connections between the control board and these components. The control board sends voltage to the solenoid valve to open it, and the pressure switch monitors the resulting water level rise. A failure at any point in this chain, whether mechanical, electrical, or supply-side, can produce the E4 code.

Common root causes include a kinked or closed water supply hose, a clogged inlet valve screen, a failed solenoid valve that does not open despite receiving the signal, or a faulty pressure switch that fails to report the rising water level to the control board. Low household water pressure can also prevent adequate fill within the allotted time. When E4 appears, the control offers the option to press START to attempt continuing the program, or press ESC to abort the cycle, allowing the technician or user to address the underlying issue before restarting.

Source: manufacturer service documentation.

Common causes of E4

  1. 01

    Closed or restricted water supply

    Wiring / connection

    The hot or cold water shutoff valves behind the washer may be partially or fully closed, or the supply hoses may be kinked. Check that both valves are fully open and hoses are free of kinks or blockages.

  2. 02

    Clogged inlet valve screens

    Wiring / connection

    Sediment and mineral deposits can clog the small mesh screens at the water inlet valve connections, severely restricting flow. Remove the supply hoses and inspect the screens, cleaning or replacing them as needed.

  3. 03

    Failed water inlet solenoid valve

    Part replacement

    The solenoid valve may have received the activation signal from the control board but failed to open mechanically or electrically. This can be confirmed by checking for proper voltage at the valve terminals during a fill cycle and testing the solenoid coil for correct resistance.

  4. 04

    Faulty pressure switch or water level sensor

    Part replacement

    If the pressure switch is defective, it may not register rising water even when fill is occurring normally, causing a false E4 fault. Inspect the pressure switch hose for blockages or cracks and test the switch for correct operation.

  5. 05

    Low household water pressure

    Wiring / connection

    Insufficient water pressure from the home supply may cause fill to proceed too slowly to satisfy the machine's timing threshold. Check the household water pressure and ensure it meets the minimum specification required by the machine.

See the test procedure for each cause

Frequently asked questions about E4

What does E4 mean on a ADC washer?
The E4 code on an ADC washer means the machine detected a water inlet fault. The control board activated the solenoid valve to begin filling the tub, but the water level did not rise within the pre-established time limit. This points to a problem with the water supply, the inlet valve, or the water level sensing system.
How do I fix an E4 error on my ADC washer?
Start by checking that both water supply valves behind the washer are fully open and that the hoses are not kinked. Next, inspect the inlet valve screens for sediment buildup and clean them if blocked. If the water supply appears normal, the inlet solenoid valve or pressure switch may need testing and possible replacement. Pressing START will allow the machine to attempt continuing the cycle after you have addressed any obvious supply issues.
Will resetting my ADC washer clear the E4 code?
Pressing ESC will end the current program and may clear the displayed error, but the underlying cause must be resolved or the code will return on the next fill cycle. The machine provides the option to press START to continue or ESC to abort, but neither action repairs the root cause of the fault. Diagnose and correct the water supply or valve issue before running another cycle.
Is it safe to keep using my washer when the E4 code appears?
Continuing to run the washer without addressing E4 is not recommended. If the tub is not filling correctly, the machine may attempt to run a wash cycle without sufficient water, which can affect wash performance and potentially stress other components. Identify and resolve the fill issue before resuming normal operation.
How much does it cost to repair an ADC washer E4 error?
Repair costs vary depending on the cause. If the issue is simply a closed valve or a clogged inlet screen, there may be little to no cost involved. Replacing a faulty water inlet solenoid valve typically runs in the range of $30 to $100 for the part, plus labor if a technician is needed. A defective pressure switch is generally in a similar price range, with total repair costs varying based on local labor rates.

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