Samsung Heat Pump Error Code E252

E252 indicates a breakaway fault with the discharge temperature sensor on the fixed-speed compressor 1. The control board has detected that the sensor signal is absent or out of range, which typically means the sensor has separated from its holder or the wiring connection has been lost. The heat pump may reduce functionality or shut down to protect the compressor until the issue is resolved.

It is not recommended to continue operating the heat pump with E252 active. The discharge temperature sensor protects the compressor from overheating, and running the system without a valid sensor signal removes that safeguard. Continued operation could result in compressor damage, which is significantly more costly to repair than the sensor itself.

A power reset may temporarily clear the E252 code, but the error will return if the underlying problem with the sensor or its wiring has not been corrected. Resetting without addressing the root cause is not a reliable fix and risks compressor damage from unprotected operation. The sensor connection and wiring should be inspected and repaired before relying on the system again.

If the sensor has simply come loose from its holder, reattaching it is a straightforward task that a knowledgeable DIYer comfortable working on HVAC equipment can perform. However, if the wiring is damaged or the sensor needs replacement, a qualified technician with refrigerant handling certification should complete the repair, especially since the discharge line is part of the high-pressure refrigerant circuit.

If the fix is simply reseating the sensor in its holder, there may be no parts cost, with only a service call fee involved, typically in the range of $75 to $150 depending on your area. If the sensor requires replacement, parts and labor together generally run in the range of $150 to $400. A control board replacement, if ultimately needed, can cost significantly more.