What factors can contribute to a cad cell malfunction?

A malfunction of the cad cell, which is a critical component in an oil burner system for sensing flame presence, can indeed be significantly influenced by a dirty combustion chamber. When the combustion chamber is dirty, it can lead to incomplete combustion and increased soot production. This soot can accumulate on the cad cell lens, obscuring its ability to detect the flame effectively. As a result, the burner may not operate correctly, leading to issues such as frequent cycling on and off or even complete system failure.

While other factors like high oil pressure, improperly sized venting, and changes in fuel type can impact the overall operation of the burner and combustion efficiency, they do not have the same direct effect on the cad cell's ability to sense flame as the condition of the combustion chamber does. A clean combustion chamber allows the cad cell to work properly by maintaining a clear view of the flame, thus ensuring the safety and efficiency of the oil burning process.