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Error code reference

Samsung Air Conditioner Error Code E167

Change of EVAP OUT temperature of other indoor unit detected during piping check.

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Change of EVAP OUT temperature of other indoor unit detected during piping check.

First step from the service manual

Check indoor unit address matches MCU; check EEV connection.

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

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What E167 means on a Samsung air conditioner

Error code E167 on a Samsung multi-split or VRF air conditioning system is triggered during the piping check process when the system detects a change in the evaporator outlet (EVAP OUT) temperature of an indoor unit other than the one currently being tested. During a piping check, the system cycles each indoor unit individually and monitors its EVAP OUT sensor to confirm correct refrigerant flow and proper unit identification. If a different indoor unit shows a temperature response during this sequence, it indicates that refrigerant is flowing through or affecting the wrong branch, which points to an addressing conflict or a valve control problem.

The two most common root causes align directly with the first diagnostic steps: an indoor unit address mismatch relative to the MCU (Main Control Unit), and a faulty or disconnected Electronic Expansion Valve (EEV). If the indoor unit address is incorrectly set, the MCU cannot properly sequence the piping check, and temperature changes may be attributed to the wrong unit. The EEV controls refrigerant flow into a specific indoor unit, and if it fails to close properly or is disconnected, refrigerant will continue flowing into that unit even when it should not be active, causing an unintended EVAP OUT temperature shift.

Diagnosis should begin by verifying that each indoor unit's DIP switch or address setting matches its assigned MCU address. Next, inspect the EEV connector on the affected indoor unit for secure seating and continuity. A malfunctioning EEV that remains partially open will allow refrigerant flow outside the commanded sequence, directly triggering E167. Resolving the address conflict or replacing the defective EEV will typically clear this fault after a successful piping check is re-initiated.

Source: manufacturer service documentation.

Common causes of E167

  1. 01

    Indoor unit address mismatch

    Wiring / connection

    If an indoor unit's address does not match the address stored in the MCU, the piping check sequence cannot correctly isolate each unit, causing temperature changes to be detected in the wrong unit. Verify all indoor unit DIP switch or rotary address settings match the MCU configuration.

  2. 02

    EEV disconnected or wiring fault

    Wiring / connection

    A loose or disconnected EEV connector prevents the valve from receiving close commands during the piping check, allowing unintended refrigerant flow. Inspect the EEV harness connector at the indoor unit PCB for secure contact and signs of damage.

  3. 03

    Faulty Electronic Expansion Valve (EEV)

    Part replacement

    An EEV that is mechanically stuck open or has failed coil windings will not close on command, causing refrigerant to flow into that unit during another unit's piping check test. Testing EEV coil resistance and observing valve response can confirm this failure.

  4. 04

    Incorrect piping configuration

    Wiring / connection

    If refrigerant lines are physically connected to the wrong indoor units relative to the system addressing, the piping check will consistently detect activity on unintended units. This requires tracing and verifying the physical refrigerant line routing against the system wiring diagram.

  5. 05

    Indoor unit PCB fault

    Part replacement

    A defective indoor unit control board may fail to properly command the EEV or report sensor data correctly during the piping check, leading to false temperature change detections on that unit. Board-level diagnosis or replacement may be necessary if all other causes are ruled out.

See the test procedure for each cause

Frequently asked questions about E167

What does E167 mean on a Samsung air_conditioner?
E167 indicates that during the system's piping check routine, a change in evaporator outlet temperature was detected on an indoor unit that was not supposed to be active at that moment. This points to a unit addressing conflict or an Electronic Expansion Valve that is not closing correctly. The piping check is a commissioning-stage test that confirms each indoor unit is connected to its correct refrigerant branch.
Can I fix E167 on my Samsung AC myself?
Correcting an indoor unit address mismatch is something a knowledgeable technician or installer can do by adjusting DIP switch or rotary address settings and then re-running the piping check. However, diagnosing and replacing an EEV or PCB requires refrigeration system knowledge and access to internal components, so professional service is recommended for those steps. Attempting repairs without proper tools and training may worsen the fault.
Is it safe to keep running my Samsung AC while E167 is active?
E167 typically appears during the initial commissioning piping check and will prevent the system from completing startup in normal operation mode. Running the system with an unresolved EEV fault risks inadequate refrigerant distribution, which can cause compressor strain over time. It is best to resolve the error before placing the system into regular service.
How much does it cost to repair a Samsung AC showing E167?
If the fix is simply correcting an address setting, labor costs are typically modest, generally in the range of $75 to $150 for a service call. If an EEV replacement is required, parts and labor combined can range from $200 to $500 or more depending on the unit model and local labor rates. A PCB replacement would fall at the higher end of that range or beyond.
Will resetting the Samsung AC clear the E167 error?
A power reset may clear the error temporarily, but if the underlying cause, such as an address mismatch or a faulty EEV, has not been corrected, E167 will return the next time a piping check is run. The piping check must complete successfully without detecting unintended temperature changes before the system will operate normally. A proper repair of the root cause is required for the error to stay cleared.

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