To correct a flood back problem caused by ice or frost on an AXV spring chamber, you should:

A flood back problem in a refrigeration system often results from ice or frost accumulating on the expansion valve (AXV) spring chamber. This situation can disrupt the normal functioning of the valve, leading to improper refrigerant flow and potentially causing compressor issues.

The most effective solution is to remove the valve, disassemble it, and clean it thoroughly. This process allows for the identification and removal of any ice or frost buildup, ensuring that the valve's components can operate as intended. Cleaning also addresses potential contaminants that may have accumulated, which could hinder the valve's performance.

While other options like increasing the refrigerant charge or heating the valve could provide temporary relief, they do not address the root cause of the problem. Heating the valve may create a short-term fix but does not ensure the valve will operate correctly over time, and increasing the refrigerant charge could lead to additional issues. Replacing the valve may be an option in severe cases of malfunction, but identifying and rectifying the actual cause, in this case, cleaning and maintaining the existing valve, is generally the best first step.