Samsung Heat Pump Error Code P472

P472 indicates an indoor unit Electronic Expansion Valve (EEV) close failure detected on the first check cycle, meaning the control board commanded the valve to open but did not detect the valve responding correctly. The EEV controls refrigerant flow through the indoor heat exchanger. This fault protects the system from operating with restricted refrigerant flow, which can damage the compressor and reduce efficiency.

Continuing to operate the system with a P472 error is not recommended. If the EEV is stuck closed, the refrigerant circuit will be operating under abnormal conditions, which puts stress on the compressor and can lead to more expensive damage. The system may still attempt to run, but cooling or heating performance will be severely reduced or absent. Shut the unit down and have it inspected promptly.

A power reset may temporarily clear the P472 code because it is flagged as a first-detection event, but the fault will return if the underlying problem with the EEV or its wiring is not corrected. Repeated resets without addressing the root cause can allow the system to log additional fault events and escalate to a full lockout condition. A reset should only be used after the wiring has been inspected and any identified issues have been corrected.

A homeowner can safely check whether the EEV wiring connector at the indoor unit PCB is firmly seated and free of visible damage, as this is the first recommended diagnostic step. However, testing coil resistance, diagnosing the PCB driver circuit, or replacing the valve itself involves working inside the unit and handling refrigerant-side components, which is best left to a qualified technician. Attempting repairs beyond the wiring check without proper tools and training could cause further damage.

Repair costs depend on the root cause. If the fix is simply reseating a loose connector, the cost may only be the service call fee, typically in the range of $75 to $150. Replacing an EEV coil or valve body can cost between $150 and $400 or more, depending on parts and labor rates in your area. An indoor PCB replacement is generally the most expensive repair, often ranging from $300 to $600 or higher.