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Error code reference

Samsung Air Conditioner Error Code E552

Low discharge pressure (high pressure of 9 kg/cm² for 10 minutes continuous).

Samsung codesSamsung air conditioner codes
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What the E552 error code actually means

Your Samsung air conditioner detected that the refrigerant pressure on the high side of the system stayed too high for too long, roughly 10 continuous minutes, which caused it to stop and log this error. This often happens when airflow over the outdoor unit is blocked, the refrigerant charge is off, or outside conditions are very cold and the unit is barely being asked to cool anything. If it is cold outside and your system is only lightly cooling, this may not be a real problem at all.

Diagnostic procedure

The full E552 procedure

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First diagnostic step
Not an error when indoor cooling capacity below 4000W at outdoor temp below 0°C.
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Most common causes of E552

Ranked by how often they cause this code
  1. 1Restricted condenser coil airflow
  2. 2Refrigerant charge imbalance
  3. 3Faulty or contaminated expansion valve
  4. 4High-pressure sensor failure
  5. 5Normal operation in cold ambient below 0°C with low cooling load

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Questions people ask about E552

What does E552 mean on a Samsung air_conditioner?
E552 means the system detected a high-side discharge pressure at or above 9 kg/cm² sustained continuously for 10 minutes. Samsung's control board treats this sustained pressure condition as a low discharge pressure fault and shuts the system down to prevent damage. However, if the outdoor temperature is below 0°C and indoor cooling capacity is below 4000W, the code is not considered a true fault and can be disregarded.
Is E552 dangerous and should I stop using my air conditioner?
The system protects itself by shutting down when E552 triggers, so continuing to force operation is not recommended until the underlying cause is identified. Sustained high discharge pressure can stress the compressor and other high-side components if the root cause is not addressed. If the code clears under cold, low-load conditions as described in Samsung's exclusion criteria, operation is considered safe to resume.
How much does it cost to repair an E552 fault on a Samsung air conditioner?
Repair costs vary widely depending on the cause. A condenser coil cleaning typically runs in the range of $75 to $200. Refrigerant diagnosis and recharge can cost between $150 and $400 depending on refrigerant type and the amount needed. Replacing a high-pressure sensor or expansion valve, including parts and labor, generally falls in the $200 to $600 range. A full diagnostic visit from an HVAC technician is the best first step to get an accurate estimate.
Can I fix E552 myself or do I need a technician?
Some causes are DIY-friendly. You can check for obstructions around the outdoor unit, clean a dirty condenser coil, and confirm that ambient temperatures are not simply triggering the low-load cold-weather exclusion. However, diagnosing refrigerant charge issues, testing the high-pressure sensor accurately, or replacing an expansion valve requires refrigerant handling certification and specialized equipment, so those steps should be handled by a licensed HVAC technician.
Will resetting the unit clear the E552 error?
A power reset may temporarily clear the fault display, but if the underlying condition causing sustained high-side pressure still exists, the code will return once the unit runs for another 10-minute period under the same conditions. A reset is useful for confirming whether the fault recurs, but it does not address the root cause. Persistent recurrence after multiple resets points to a component or refrigerant charge issue requiring professional diagnosis.

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