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Error code reference

Samsung Heat Pump Error Code E476

Digital compressor 1 sump temperature sensor breakaway

Samsung codesSamsung heat pump codes
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What the E476 error code actually means

Your Samsung heat pump has detected that the temperature sensor attached to the bottom of compressor 1 is not registering any meaningful temperature change after the system has been running for an hour. This usually means the sensor has come loose from the compressor and is no longer able to detect the heat being generated. A technician will need to inspect and reattach the sensor to get the system running normally again.

Diagnostic procedure

The full E476 procedure

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1
First diagnostic step
Check whether the relevant compressor sensor is broken away; assemble and adjust.
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Most common causes of E476

Ranked by how often they cause this code
  1. 1Sensor physically detached from compressor sump
  2. 2Loose or improperly secured sensor mounting
  3. 3Damaged sensor wiring or connector
  4. 4Faulty sump temperature sensor
  5. 5Compressor not generating heat due to refrigerant issue

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Questions people ask about E476

What does E476 mean on a Samsung heat pump?
E476 means the sump temperature sensor on digital compressor 1 has experienced a breakaway condition. The system monitors sump temperature after compressor startup and expects to see a rise of at least 2°C within 60 minutes. If that change is not detected, the code is triggered, most often because the sensor has detached from the compressor surface.
Is it safe to keep running my heat pump with error E476 active?
Continuing to operate the system with E476 active is not recommended. The sump temperature sensor plays a role in protecting the compressor from operating outside safe thermal conditions. Running the unit without reliable sump temperature monitoring could allow an underlying issue to go undetected and potentially cause compressor damage over time.
How much does it cost to repair an E476 error on a Samsung heat pump?
If the sensor has simply detached and only requires repositioning and securing, repair costs will primarily cover the technician's diagnostic and labor time, typically in the range of $75 to $150. If the sensor or wiring needs replacement, parts costs can add $20 to $80 depending on the component, bringing the total repair estimate to a range of $100 to $250 in most cases.
Can I fix E476 myself or does it require a technician?
The initial diagnostic step, checking whether the sump sensor has physically detached and reseating it, is a straightforward inspection task. However, accessing the compressor compartment of a heat pump and working safely around refrigerant components typically requires a qualified technician. If the sensor or wiring is damaged rather than simply loose, a replacement will also need to be sourced and installed correctly.
Will resetting the heat pump clear the E476 error code?
A reset may temporarily clear the code, but it will return if the underlying cause is not resolved. Because the fault is based on a 60-minute observation window after compressor startup, the system will re-evaluate the sensor on the next run cycle and trigger E476 again if the sensor is still detached, damaged, or not making proper thermal contact with the compressor sump.

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