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Error code reference

Samsung Air Conditioner Error Code E226

PWM discharge temperature sensor open/short error (detected when outdoor temperature is over -10°C).

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PWM discharge temperature sensor open/short error (detected when outdoor temperature is over -10°C).

First step from the service manual

Check if the digital compressor discharge temperature sensor connector is separated from PCB; if so, reconnect and restart.

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

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What E226 means on a Samsung air conditioner

Error code E226 on a Samsung air conditioner indicates a PWM discharge temperature sensor open or short circuit fault. This sensor monitors the temperature of refrigerant leaving the compressor discharge port on the outdoor unit. The error is specifically active when the outdoor ambient temperature is above -10°C, meaning the system expects the sensor to be providing valid readings under normal operating conditions. An open circuit condition means the sensor circuit has an unexpected break, while a short circuit means the resistance has dropped abnormally low, in either case producing a signal the PCB cannot interpret as a valid temperature reading.

The discharge temperature sensor plays a critical role in protecting the compressor from overheating. If the PCB loses accurate temperature data from this sensor, it cannot regulate compressor operation safely. Samsung designates this fault specifically for the digital (inverter-driven) compressor discharge sensor, distinguishing it from other temperature sensor faults in the system. The condition triggers when the sensor output falls outside the acceptable resistance or voltage range expected by the outdoor unit control board.

The first diagnostic step is straightforward: inspect the discharge temperature sensor connector at the outdoor PCB. A disconnected or poorly seated connector is the most common cause and requires no parts replacement. If the connector is secure, the fault points to a failed sensor, damaged wiring harness, or a faulty outdoor PCB that is misreading the sensor signal. Resistance testing of the sensor across its terminals, compared against the expected values for the current ambient temperature, will confirm whether the sensor itself has failed.

Source: manufacturer service documentation.

Common causes of E226

  1. 01

    Disconnected sensor connector at outdoor PCB

    Wiring / connection

    The discharge temperature sensor connector may have worked loose from the outdoor control board. Reseating the connector firmly and restarting the unit is the first recommended diagnostic step and often resolves the fault immediately.

  2. 02

    Failed discharge temperature sensor

    Part replacement

    The sensor element itself may have developed an open or short circuit internally, producing a resistance value outside the acceptable range for the PCB. Testing the sensor resistance at the connector terminals and comparing against a known good value for the ambient temperature will confirm this failure.

  3. 03

    Damaged wiring harness

    Part replacement

    Wiring between the discharge temperature sensor and the outdoor PCB may be broken, chafed, or pinched, causing an intermittent or permanent open circuit. Inspect the full length of the harness for visible damage, especially near any sharp edges or moving components.

  4. 04

    Corroded or oxidized connector pins

    Wiring / connection

    Moisture intrusion in the outdoor unit can cause corrosion on the sensor connector pins, increasing resistance to the point where the PCB reads the circuit as open. Inspect the connector for discoloration, green oxidation, or moisture and clean or replace as needed.

  5. 05

    Faulty outdoor unit PCB

    Part replacement

    If the sensor and wiring both test within specification, the outdoor control board may be failing to read the sensor signal correctly. This is the least common cause and is typically confirmed only after ruling out all sensor and wiring faults.

See the test procedure for each cause

Frequently asked questions about E226

What does E226 mean on a Samsung air conditioner?
E226 indicates a PWM discharge temperature sensor open or short circuit error on the outdoor unit. The sensor monitors the temperature of refrigerant leaving the compressor, and the control board has detected that the sensor signal is outside the valid range. This error only activates when outdoor ambient temperature is above -10°C. The system shuts down to prevent potential compressor damage from unmonitored operating temperatures.
Can I fix E226 myself, or do I need a technician?
The first step, checking and reseating the discharge temperature sensor connector on the outdoor PCB, is something a knowledgeable DIYer can attempt after powering down the unit. However, if the connector is secure and the fault persists, accurately diagnosing a failed sensor, damaged wiring, or faulty PCB requires a multimeter and some familiarity with electrical testing. In those cases, a certified technician is recommended.
Will resetting the air conditioner clear the E226 error?
A reset may temporarily clear the error code, but the fault will return if the underlying problem is not resolved. If the cause is simply a loose connector, reseating it before restarting should clear the code permanently. If the sensor or wiring has actually failed, the error will reappear shortly after the unit attempts to operate.
Is it safe to run my Samsung air conditioner with error code E226 active?
No, you should not attempt to bypass or ignore this error and continue running the unit. The discharge temperature sensor protects the compressor from overheating. Operating without valid sensor data removes that protection and risks serious compressor damage, which is a significantly more expensive repair than resolving the sensor fault.
How much does it cost to repair a Samsung air conditioner showing E226?
If the fix is simply reconnecting a loose sensor connector, labor costs for a service call are typically in the range of $75 to $150 depending on your location. If the discharge temperature sensor itself needs replacement, expect parts and labor costs combined to range from $150 to $350. A faulty outdoor PCB is the most expensive scenario, with parts and labor potentially ranging from $300 to $600 or more.

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