LG Heat Pump Error Code CH14

CH14 indicates a flow switch fault in the water circuit. The system has detected either that the flow switch is open while the water pump is running, or that it is closed while the pump is not running. This mismatch triggers a safety shutdown to protect the heat exchanger. The root cause can be low water pressure, a blocked filter, air in the system, or a failed flow switch.

A reset will clear the fault code temporarily, but if the underlying cause is not resolved, CH14 will return as soon as the system restarts and the control board checks the flow switch again. Always diagnose and correct the root cause before resetting, otherwise repeated faults can occur and may cause additional wear on the system.

Repair costs depend heavily on the cause. If the fix is simply re-pressurizing the system or cleaning a strainer, costs may be minimal, covering only a service call fee in the range of $75 to $150. Replacing a failed flow switch typically adds $50 to $150 in parts. A failed water pump is the most expensive scenario, with parts and labor potentially ranging from $300 to $700 or more depending on the system size and installation complexity.

Some causes of CH14 are accessible to a knowledgeable DIYer. Checking the system pressure gauge and re-pressurizing to 1.5 to 2.0 bar, bleeding air from the pipework, and cleaning a blocked strainer are all tasks that do not require specialist tools. However, electrical continuity testing of the flow switch and diagnosing a failed pump are better suited to a qualified technician.

No. CH14 is a protective shutdown code, meaning the unit has stopped operating to prevent damage to internal components. Running the system with inadequate water flow can cause the heat exchanger to overheat or freeze, potentially causing costly damage. The fault should be diagnosed and resolved before returning the unit to service.