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Error code reference

Samsung Air Conditioner Error Code P507

Compressor down by high pressure sensor protection control 1.

Samsung codesSamsung air conditioner codes

Compressor down by high pressure sensor protection control 1.

First step from the service manual

Check service valves, fan motor operation, refrigerant charge.

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

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What P507 means on a Samsung air conditioner

Error code P507 on a Samsung air conditioner indicates that the unit has shut down the compressor due to high pressure sensor protection control 1. This is a safety-driven shutdown triggered when the high-side refrigerant pressure exceeds a safe operating threshold. The high pressure sensor continuously monitors refrigerant pressure on the discharge side of the compressor, and when the system detects an unsafe pressure level, the compressor is commanded off to prevent mechanical damage or refrigerant circuit failure.

The most common causes of elevated high-side pressure involve restrictions to heat rejection. If the outdoor unit's service valves are not fully open, refrigerant flow is restricted and pressure builds rapidly on the discharge side. A malfunctioning or slow outdoor fan motor can also cause this condition, since inadequate airflow over the condenser coil prevents proper heat exchange and allows head pressure to climb well above normal operating range.

An overcharged refrigerant system is another frequent culprit, as excess refrigerant raises baseline operating pressures and can push the system past the high pressure cutout threshold even under normal load conditions. Non-condensable gases such as air or nitrogen in the refrigerant circuit produce a similar effect. Diagnosing P507 requires checking that all service valves are fully open, verifying outdoor fan motor operation and blade rotation, and confirming that the refrigerant charge level is within specification using manifold gauge readings.

Source: manufacturer service documentation.

Common causes of P507

  1. 01

    Closed or partially closed service valves

    Wiring / connection

    If the liquid or suction service valves on the outdoor unit are not fully open, refrigerant flow is restricted and discharge pressure rises quickly. Physically inspect both service valves and confirm they are fully back-seated in the open position.

  2. 02

    Outdoor fan motor failure or reduced airflow

    Part replacement

    A failed or underperforming outdoor fan motor prevents adequate airflow across the condenser coil, causing head pressure to climb until the high pressure sensor trips. Check that the fan starts with the compressor, spins at normal speed, and that the blade is securely attached.

  3. 03

    Incorrect refrigerant charge

    Wiring / connection

    An overcharged refrigerant system raises high-side pressure above normal operating levels and can trigger high pressure protection even in moderate ambient temperatures. Attach manifold gauges to verify that high-side pressure is within the system's specified operating range.

  4. 04

    Non-condensable gases in the refrigerant circuit

    Wiring / connection

    Air or nitrogen introduced during a previous service can elevate high-side pressure readings disproportionately to the actual refrigerant charge. This condition requires recovering the refrigerant, evacuating the system, and recharging with the correct refrigerant type and quantity.

  5. 05

    Condenser coil blockage

    Wiring / connection

    A heavily fouled or blocked condenser coil restricts airflow and reduces heat rejection capacity, causing discharge pressure to rise. Inspect the outdoor coil fins for dirt, debris, or physical damage and clean or straighten as needed.

See the test procedure for each cause

Frequently asked questions about P507

What does P507 mean on a Samsung air conditioner?
P507 means the Samsung air conditioner has shut down the compressor because the high pressure sensor detected unsafe refrigerant pressure on the discharge side of the system. This is a protective function designed to prevent compressor and refrigerant circuit damage. The unit will not restart normally until the underlying cause of elevated high-side pressure is corrected.
Can I fix P507 on my Samsung air conditioner myself?
Some steps, such as checking that outdoor unit service valves are fully open and cleaning a blocked condenser coil, can be performed without specialized tools. However, diagnosing refrigerant charge issues, checking fan motor performance, and working with refrigerants requires EPA certification and professional equipment. If basic checks do not resolve the error, a licensed HVAC technician should be called.
Will resetting the unit clear the P507 error?
Resetting the unit may temporarily clear the P507 fault and allow the compressor to restart, but the error will return if the root cause has not been addressed. High-side pressure will exceed the safety threshold again under operating conditions, causing the compressor to shut down repeatedly. A reset should only be used after performing diagnostic checks and correcting any identified issues.
Is P507 on a Samsung air conditioner a safety concern?
Yes, persistently high refrigerant pressure is a serious condition that can stress compressor components, refrigerant lines, and fittings. The P507 protection control is designed to shut the compressor down before damage occurs, so the system should not be forced to run while this fault is active. Continued operation attempts without resolving the cause can lead to compressor failure or refrigerant line rupture.
How much does it cost to repair a Samsung air conditioner showing P507?
Repair costs vary depending on the root cause identified. Simple service valve adjustments or coil cleaning may only involve a diagnostic service call fee, typically in the range of $75 to $150. Outdoor fan motor replacement can cost between $150 and $400 including parts and labor. If refrigerant recovery, evacuation, and recharge are needed, costs can range from $200 to $600 or more depending on the refrigerant type and system capacity.

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