Samsung Heat Pump Error Code E122

E122 means the compressor has been shut down because the indoor heat exchanger temperature fell below -4°C for more than 5 minutes during cooling operation. This is a freezing protection shutdown designed to prevent ice buildup on the indoor coil and protect the compressor. The most common cause is restricted airflow through the indoor unit. Cleaning the dust filter and removing any obstructions around the indoor unit is the recommended first step.

No, you should not attempt to override the shutdown and continue running the unit. The E122 shutdown exists to prevent ice from building up on the coil and to protect the compressor from damage caused by liquid refrigerant ingestion. Operating the system while the underlying cause is unresolved could result in more serious and costly component failure.

If the fix is simply cleaning the filter or removing an obstruction, there is no parts cost involved. If the issue is a refrigerant leak, repair costs typically range from a few hundred dollars to over a thousand dollars depending on the leak location, refrigerant type, and regional labor rates. Replacing a faulty indoor fan motor or temperature sensor generally falls in the range of $150 to $500 including parts and labor, though prices vary by market and service provider.

In many cases, cleaning the indoor unit's dust filter and clearing any airflow obstructions will resolve the issue, and that can be done without professional help. If the error returns after the filter is clean and airflow is unobstructed, the cause may be a low refrigerant charge or a faulty component, both of which require a qualified technician to diagnose and repair.

A power reset may clear the error code temporarily and allow the unit to restart, but if the root cause has not been corrected, the indoor coil will freeze again and E122 will return. The error will clear reliably only after the condition causing the coil to drop below -4°C during cooling has been identified and fixed.