Samsung Refrigerator Error Code R Comp Motor Constraint Error

This error means the refrigerator compartment compressor motor has been detected as mechanically constrained, meaning it cannot rotate normally. The inverter control system monitors motor performance and triggers this code when the compressor fails to reach its required operating speed. The cause can be a failing compressor, a problem with the inverter PCB, or an abnormal condition in the sealed refrigerant system.

It is not advisable to continue relying on the refrigerator for food storage when this error is active, as the compressor is not operating correctly and the unit will not maintain safe temperatures. Continuing to attempt operation with a constrained compressor can cause additional damage to the compressor or inverter components. Transfer perishable food to another unit and address the fault promptly.

A power reset may temporarily clear the error code, but if the underlying mechanical or electrical fault is still present, the error will return once the inverter attempts to run the compressor again. Resetting is a useful first step to rule out a transient fault, but a persistent return of the code confirms that a real fault exists and requires proper diagnosis. Do not rely on repeated resets as a long-term solution.

Some portions of the diagnosis are DIY-friendly, such as checking the input voltage supply and visually inspecting the inverter PCB for obvious solder defects. However, repairs involving the sealed refrigerant system or compressor replacement require certified technicians and specialized equipment. If the inverter PCB has a clearly bad solder joint, a qualified technician with soldering skills may be able to reflow the joint as a repair.

Repair costs vary significantly depending on the root cause. Inverter PCB replacement typically ranges from around $150 to $400 including parts and labor. Compressor replacement is the most expensive repair, often ranging from $400 to $800 or more depending on the model and labor rates. Getting a diagnostic assessment from a technician before committing to a repair is recommended, as compressor costs can sometimes approach the value of older units.