Samsung Heat Pump Error Code E116

E116 indicates the system detected suction pressure below the minimum threshold before a pump down sequence could begin. Specifically, the low pressure sensor read below 3.1 kg/cm2G in cooling mode or below 2.6 kg/cm2G in heating mode for three consecutive seconds. The unit shuts down to protect the compressor from damage caused by operating at insufficient pressure. This fault requires pressure measurement with a manifold gauge and comparison against the sensor reading to diagnose correctly.

No, you should not attempt to continue running the heat pump while E116 is active. The system has deliberately halted operation to prevent compressor damage from low refrigerant pressure. Forcing the unit to run under these conditions can cause compressor failure, which is a much more expensive repair than addressing the underlying pressure issue. Leave the unit off and schedule a service call promptly.

Repair costs depend entirely on the root cause. If the fix involves topping off a minor refrigerant leak and sealing it, costs typically range from a few hundred dollars to over a thousand dollars depending on refrigerant type, leak location, and labor rates. A low pressure sensor replacement is generally a lower-cost repair, often in the range of one hundred to three hundred dollars for parts and labor. Expansion valve replacement or major refrigerant system work can push costs significantly higher, so an accurate diagnosis is the essential first step.

Most causes of E116 require professional diagnosis and repair. If the system is low on refrigerant, only a certified HVAC technician can legally handle refrigerant and recharge the system. Sensor replacement and expansion valve inspection also require technical knowledge and proper tools. Homeowners can check for obvious airflow restrictions such as dirty filters or blocked outdoor unit intake areas, but refrigerant-related work must be performed by a licensed technician.

A power reset may temporarily clear the fault display, but if the underlying cause such as a refrigerant leak or failed sensor is still present, the error will return as soon as the system attempts operation and detects low pressure again. Resetting without diagnosing and correcting the root cause does not resolve the problem and can delay necessary repairs. A proper fix requires measuring actual system pressures and identifying whether the issue is refrigerant charge, sensor accuracy, or a mechanical restriction.