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Error code reference

Samsung Heat Pump Error Code E466

Compressor low current error

Samsung codesSamsung heat pump codes
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What the E466 error code actually means

Your Samsung heat pump is detecting that the compressor, the main part that moves refrigerant and heats or cools your home, appears to be drawing very little or no electrical current when it should be running. This usually means the compressor has stopped working, a safety switch tripped to protect it, or a sensor that monitors the compressor is faulty. A technician will need to inspect the compressor and its associated components to determine the exact cause.

Diagnostic procedure

The full E466 procedure

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1
First diagnostic step
Check CT sensor connector resistance; verify CT value reads 0 when compressor is stopped.
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Most common causes of E466

Ranked by how often they cause this code
  1. 1Defective CT sensor or wiring
  2. 2OLP (overload protector) trip
  3. 3Compressor mechanical failure
  4. 4CT sensor connector resistance issue

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Questions people ask about E466

What does E466 mean on a Samsung heat pump?
E466 indicates a compressor low current error. The system detected that the CT sensor value remained below 4 amps for more than 10 minutes while the compressor should have been operating. This points to a compressor that has stopped running, a tripped overload protector, or a faulty CT sensor giving an inaccurate reading.
Is it safe to keep running my heat pump with an E466 error?
No, you should not continue operating the unit while this error is active. The E466 code means the compressor is likely not functioning correctly, and continued operation attempts could cause additional damage to the compressor or other system components. Shut the unit down and have it inspected promptly.
How much does it cost to repair an E466 error on a Samsung heat pump?
Repair costs vary significantly depending on the cause. A CT sensor replacement is typically the least expensive repair, often in the range of $100 to $300 including labor. An OLP replacement falls in a similar range. Compressor replacement is the most costly outcome, generally ranging from $1,000 to $2,500 or more depending on the unit size and labor rates in your area.
Can I fix E466 myself or do I need a technician?
Some preliminary checks, such as inspecting the CT sensor connector for visible corrosion or loose pins, can be performed by a knowledgeable DIYer. However, diagnosing a failed compressor, testing the OLP, or replacing the CT sensor typically requires electrical testing equipment and refrigerant system knowledge, so a qualified technician is recommended for most homeowners.
Will resetting the heat pump clear the E466 error?
A reset may temporarily clear the error code, but if the underlying cause, such as a defective CT sensor, a tripped OLP, or a failed compressor, is not resolved, the fault will return once the system detects the same low current condition again for over 10 minutes. Clearing the code without diagnosing the root cause is not a fix.

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