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Error code reference

Samsung Heat Pump Error Code E463

Indoor unit EVAP OUT sensor open or short error.

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What the E463 error code actually means

Your Samsung heat pump is displaying E463 because a temperature sensor inside the indoor unit is sending a signal that doesn't make sense, either no signal at all or one that's way outside the normal range. This sensor monitors how cold the indoor coil is getting, and the system has shut down to protect itself since it can't get accurate readings. A technician will need to inspect the sensor's wiring and test the sensor itself to determine whether it needs to be replaced or just reconnected.

Diagnostic procedure

The full E463 procedure

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1
First diagnostic step
Check if indoor EVAP OUT sensor connector is separated from PCB; measure resistance and compare to temperature table.
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Most common causes of E463

Ranked by how often they cause this code
  1. 1Disconnected sensor connector at PCB
  2. 2Failed NTC thermistor sensor
  3. 3Damaged or broken sensor wiring
  4. 4Corroded or contaminated connector pins
  5. 5Faulty indoor unit PCB

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Questions people ask about E463

What does E463 mean on a Samsung heat pump?
E463 indicates that the indoor unit EVAP OUT temperature sensor has been detected in an open or short circuit condition. This sensor is located at the outlet of the indoor evaporator coil and monitors refrigerant temperature. When the control board receives a resistance reading outside the valid range, it triggers E463 and disables normal operation to protect the system.
Is it safe to keep running my heat pump while E463 is displayed?
You should not continue operating the heat pump while E463 is active. The EVAP OUT sensor provides data the system uses to prevent the evaporator coil from freezing and to control refrigerant flow safely. Running the unit without a valid sensor signal could lead to coil icing, compressor damage, or other secondary faults. Address the error before resuming normal use.
How much does it cost to repair an E463 error on a Samsung heat pump?
Repair costs depend on the root cause. If the fix is simply reseating a loose connector, the cost is primarily a diagnostic service call, typically in the range of $75 to $150. Replacing the EVAP OUT sensor itself generally adds $50 to $150 in parts plus labor. If the indoor control board is at fault, board replacement can range from $200 to $500 or more depending on the specific unit model and availability of parts.
Can I fix the E463 error myself?
Some causes of E463 are accessible to a knowledgeable DIYer. Checking whether the sensor connector has come loose from the PCB and reseating it requires no special tools and no refrigerant handling. However, testing sensor resistance accurately requires a multimeter and access to the temperature-resistance reference table, and replacing the sensor or PCB involves disassembling the indoor unit, which is best left to a qualified technician.
Will resetting the heat pump clear the E463 error?
A power reset may temporarily clear the error code, but if the underlying sensor fault still exists, E463 will return once the system restarts and the PCB attempts to read the sensor again. A reset is useful for confirming whether the fault was a one-time glitch, such as a momentary connector issue, but it is not a repair. The sensor, wiring, and connector must be inspected and tested to resolve the fault permanently.

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