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Error code reference

Samsung Air Conditioner Error Code P419

Compressor SUMP temperature protection-SUMP temperature maintained over 95°C for 5 minutes.

Samsung codesSamsung air conditioner codes
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What the P419 error code actually means

Your Samsung air conditioner has detected that the compressor is running dangerously hot at its base, where the oil sits, and has shut down to prevent serious damage. This usually means something is preventing the system from cooling itself properly, such as low refrigerant, blocked airflow, or a failing compressor. A technician will need to diagnose the root cause before the unit can safely run again.

Diagnostic procedure

The full P419 procedure

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1
First diagnostic step
Perform test operation; check if digital compressor loading/unloading performs normally via S-net.
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Most common causes of P419

Ranked by how often they cause this code
  1. 1Abnormal compressor loading behavior
  2. 2Low or improper refrigerant charge
  3. 3Restricted condenser airflow
  4. 4Expansion device restriction or failure
  5. 5Compressor internal degradation

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Questions people ask about P419

What does P419 mean on a Samsung air conditioner?
P419 indicates a compressor SUMP temperature protection fault. The oil sump at the base of the compressor exceeded 95 degrees Celsius and stayed above that level for 5 continuous minutes. The unit shuts down automatically to prevent compressor damage when this threshold is reached.
Is it safe to keep running my air conditioner with a P419 error?
No. P419 is a protective fault that shuts the unit down to prevent compressor damage. Attempting to override or repeatedly reset the system while the underlying cause remains unresolved risks permanent compressor failure, which is one of the most expensive repairs possible on any air conditioning system.
How much does it cost to repair a P419 error on a Samsung air conditioner?
Repair costs vary widely depending on the cause. A refrigerant recharge or condenser cleaning typically ranges from 100 to 300 dollars. Replacing an expansion valve may run 200 to 500 dollars including labor. If the compressor itself has failed, replacement costs can range from 800 to over 2,000 dollars depending on the unit size and model, making early diagnosis important.
Can I fix P419 myself without a technician?
Some basic checks, such as clearing debris from the condenser or ensuring the outdoor unit has adequate airflow clearance, can be done without professional tools. However, diagnosing compressor loading behavior via S-net, checking refrigerant charge, or replacing components requires specialized equipment and certification. A licensed HVAC technician should handle the full diagnosis.
Will resetting the unit clear the P419 error?
A reset may temporarily clear the fault code and allow the unit to restart, but P419 will return if the root cause is not corrected. The system is designed to re-trigger the protection whenever sump temperature exceeds 95 degrees Celsius for 5 minutes, so repeated resets without repair will not resolve the issue and may worsen compressor wear.

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