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Error code reference

Samsung Air Conditioner Error Code E369

DC voltage sensor error of inverter PBA2.

Samsung codesSamsung air conditioner codes

DC voltage sensor error of inverter PBA2.

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What E369 means on a Samsung air conditioner

Error code E369 on a Samsung air conditioner indicates a DC voltage sensor error on the inverter PBA2 (Printed Board Assembly 2). The inverter PBA2 is the secondary inverter control board responsible for regulating DC voltage supplied to the compressor drive circuit. An internal voltage sensor on this board continuously monitors the DC bus voltage to ensure the inverter operates within safe parameters. When the sensor detects a reading outside the expected range, or when the sensor circuit itself fails, the system flags E369 and shuts down operation to prevent damage to downstream components.

The DC voltage sensor on the inverter PBA2 can fail due to several conditions. A fault in the sensor circuit itself, including a damaged sensing resistor or a failed voltage reference component on the board, will cause erroneous readings. Overvoltage or undervoltage conditions on the DC bus, often caused by irregularities in the incoming AC supply or a failing rectifier stage, can stress the sensor and trigger the error. Loose or corroded connector pins on the PBA2 harness can also cause intermittent or false sensor readings.

Because the inverter PBA2 is an integrated assembly, individual sensor components are typically not serviceable in isolation. If the board itself is found to be faulty after ruling out wiring and power supply issues, the entire PBA2 assembly will need replacement. Diagnosis should include inspecting the power supply voltage reaching the board, checking all associated harness connectors for damage or corrosion, and verifying that the AC input voltage is within the unit's specified operating range.

Source: manufacturer service documentation.

Common causes of E369

  1. 01

    Faulty inverter PBA2 board

    Part replacement

    The DC voltage sensor circuit on the PBA2 board itself may have failed due to a damaged component or internal short. This is the most common root cause when wiring and power supply have been ruled out.

  2. 02

    Loose or corroded wiring harness connectors

    Wiring / connection

    Connector pins supplying power or sensor signals to the PBA2 can loosen or corrode over time, causing intermittent or incorrect voltage readings. Inspect all harness connections to the PBA2 for secure seating and signs of oxidation.

  3. 03

    DC bus overvoltage or undervoltage condition

    Wiring / connection

    If the incoming AC supply voltage is outside the unit's rated operating range, the rectified DC bus voltage can exceed or fall below sensor thresholds. Check the supply voltage at the unit's disconnect with a multimeter.

  4. 04

    Failing rectifier or power module

    Part replacement

    A degraded rectifier stage can produce an unstable DC bus voltage, which the PBA2 sensor interprets as an error condition. This may be accompanied by other inverter-related fault codes.

  5. 05

    Damaged wiring between inverter boards

    Wiring / connection

    Physical damage such as chafing, pinching, or heat exposure to the wiring between the main board and PBA2 can interrupt sensor signal paths. Visually inspect all inter-board wiring for signs of damage.

See the test procedure for each cause

Frequently asked questions about E369

What does E369 mean on a Samsung air conditioner?
E369 indicates a DC voltage sensor error on the inverter PBA2, the secondary inverter control board in the unit. The sensor that monitors DC bus voltage has reported a value outside acceptable limits or has failed. The system shuts down to protect the compressor and drive components from potential damage.
Can I fix E369 myself or does it require a technician?
Basic checks such as inspecting wiring connectors and verifying that the AC supply voltage is within spec can be performed by a knowledgeable DIYer. However, diagnosing and replacing the inverter PBA2 board involves working with high-voltage DC circuits and requires proper safety precautions and equipment. A certified HVAC or appliance technician is strongly recommended for this repair.
Is it safe to keep running my air conditioner with error code E369?
No. The E369 error causes the unit to shut down as a protective measure, so continued operation is not possible until the fault is cleared. Attempting to bypass the error and force operation could result in damage to the compressor or inverter components. The unit should remain off until the underlying cause is diagnosed and repaired.
Will resetting the unit clear the E369 error?
A power reset may temporarily clear the error code, but if the underlying fault in the PBA2 sensor circuit or wiring persists, the code will return quickly. A reset alone is not a fix for E369. Persistent reappearance of the code after a reset confirms that a hardware fault needs to be addressed.
How much does it cost to repair a Samsung air conditioner showing E369?
Repair costs vary depending on the root cause. If the fix is limited to reseating connectors or correcting the power supply, labor costs alone could range from around 80 to 150 dollars. If the inverter PBA2 board requires replacement, parts and labor combined can range from approximately 200 to 500 dollars or more, depending on the model and local labor rates.

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