Samsung Air Conditioner Error Code E277

E277 indicates an error with the top sensor of compressor 2, specifically a short or open circuit in the thermistor that monitors that compressor's temperature. The control board cannot read a valid signal from the sensor, so the system shuts down to prevent compressor damage. A technician will need to check the connector and measure the sensor's resistance to diagnose the fault.

No, it is not recommended. The E277 fault disables temperature monitoring for compressor 2, which means the system cannot detect an overheating condition on that compressor. Continued operation without a functioning sensor could lead to compressor damage or failure. The unit should remain off until the sensor fault is resolved.

A reset may temporarily clear the error code, but if the underlying sensor fault still exists, the code will return once the unit attempts to operate and reads the faulty signal again. Resetting is useful for confirming whether a connector reseating resolved the issue, but it is not a permanent fix. The thermistor and wiring must be tested and the root cause corrected to fully resolve E277.

A knowledgeable DIYer can inspect the sensor connector for looseness or visible damage and reseat it to see if that clears the fault. However, measuring thermistor resistance and tracing wiring harness faults requires a multimeter and familiarity with the unit's layout. If the sensor itself has failed, sourcing and replacing the correct thermistor is best handled by someone comfortable working near high-voltage compressor components.

If only the thermistor sensor needs replacement, parts costs are generally low, typically in the range of $15 to $60 for the sensor itself, plus labor. If the wiring harness is damaged, repair costs could range from $80 to $200 depending on the extent of the damage and labor rates in your area. Control board replacement, if required, is more expensive and could range from $200 to $500 or more including parts and labor.