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Error code reference

Samsung Air Conditioner Error Code E152

Error due to closed EEV of indoor unit (2nd detection)

Samsung codesSamsung air conditioner codes

Error due to closed EEV of indoor unit (2nd detection) - valve will not open.

First step from the service manual

Check if EEV wire is connected to PCB.

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

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What E152 means on a Samsung air conditioner

The E152 error code on a Samsung air conditioner indicates a second-detection failure of the indoor unit's Electronic Expansion Valve (EEV). The EEV is a precision refrigerant metering device that controls the flow of refrigerant into the indoor heat exchanger. When the system detects that the EEV is not opening despite receiving open commands from the PCB (printed circuit board), it logs a first-detection fault. If the valve still fails to respond after a retry cycle, the system escalates to the E152 second-detection error and typically locks out operation to protect the refrigerant circuit from damage.

The EEV operates via a stepper motor that receives pulse signals from the indoor unit PCB. When the valve fails to open, refrigerant flow to the indoor coil is restricted or completely blocked, which prevents proper heat exchange and causes the system to shut down. The most fundamental diagnostic step is verifying that the EEV wiring harness is properly seated at both the valve connector and the PCB header, since a loose or disconnected wire is the most common and easily corrected cause of this fault.

Beyond wiring, the root cause may lie with the EEV stepper motor itself, which can fail due to internal coil burnout or mechanical seizure of the valve body. The PCB driver circuit responsible for sending the pulse signals to the stepper motor can also fail, preventing correct actuation signals from ever reaching the valve. Refrigerant system conditions such as extreme pressure imbalance can sometimes hold a valve closed against its motor, though this is less common as a standalone cause.

Source: manufacturer service documentation.

Common causes of E152

  1. 01

    Disconnected or loose EEV wiring harness

    Wiring / connection

    The wire connector between the EEV stepper motor and the indoor PCB may have come loose or become fully disconnected, cutting off the control signal entirely. Inspect both ends of the harness for secure seating and check for damaged or corroded pins.

  2. 02

    Failed EEV stepper motor

    Part replacement

    The stepper motor coils inside the EEV can burn out or seize, preventing the valve from responding to open commands even when wiring and PCB signals are correct. Resistance testing of the motor coil windings can help confirm this failure.

  3. 03

    Indoor PCB driver circuit failure

    Part replacement

    The PCB contains a dedicated driver circuit that generates the pulse signals needed to step the EEV motor open and closed. If this circuit is faulty, the valve receives no valid signal and will not actuate, even though the wiring and valve are intact.

  4. 04

    Mechanically seized EEV valve body

    Part replacement

    Debris, moisture contamination, or corrosion inside the valve body can cause the needle or piston to seize in the closed position. The motor may be functioning correctly but cannot physically move the valve mechanism.

  5. 05

    Refrigerant pressure imbalance preventing valve movement

    Wiring / connection

    Abnormally high pressure differential across the EEV can overpower the stepper motor and hold the valve closed. This condition is usually accompanied by other refrigerant circuit symptoms and should be checked with manifold gauges.

See the test procedure for each cause

Frequently asked questions about E152

What does E152 mean on a Samsung air conditioner?
E152 indicates that the indoor unit's Electronic Expansion Valve (EEV) has failed to open on two consecutive detection attempts. The system sends open commands to the valve via the PCB, but the valve does not respond, triggering a lockout. This error is a second-detection fault, meaning the system already attempted recovery once before escalating to E152.
Can I fix the E152 error myself without a technician?
A homeowner can safely check whether the EEV wiring harness has become loose or disconnected at the indoor PCB, since this is the first recommended diagnostic step and requires no special tools. However, testing stepper motor coil resistance, diagnosing PCB driver circuits, or replacing the EEV requires technical knowledge and specialized tools, so those steps should be handled by a qualified technician.
Is it safe to keep running my Samsung AC with an E152 error?
No. The E152 fault causes the system to shut down specifically because operating with the EEV stuck closed would prevent refrigerant from flowing properly through the indoor coil. Forcing the system to run under these conditions could damage the compressor due to refrigerant starvation or abnormal pressures. Leave the unit off until the fault is diagnosed and repaired.
Will resetting the air conditioner clear the E152 error?
A power reset may temporarily clear the fault display and allow the unit to attempt startup again, but if the underlying problem with the EEV or its wiring has not been corrected, the error will return quickly. Because E152 is a second-detection fault, the system has already attempted one recovery cycle on its own, making a simple reset unlikely to resolve the issue.
How much does it cost to repair an E152 error on a Samsung air conditioner?
Repair costs vary depending on the root cause. If the fix is a reconnected wiring harness, the cost may be limited to a service call fee, typically in the range of $75 to $150. Replacing a failed EEV stepper motor or valve body generally costs between $150 and $400 including parts and labor. PCB replacement is usually the most expensive repair, often ranging from $250 to $600 or more depending on the unit model.

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