Performed 1 system heating maintenance. Flame rod corrroded and needs replacement. Voltage absorption system reading below acceptable levels and needs to be replaced. No form of water safety. Recommend installing inline pvc switch to avoid water damage. Combustion readings are not within acceptable range. To much oxygen and not enough carbon monoxide in flu gas. System needs combustion calibration. Single wall flu pipe ran 6 feet to furnace. Recommend replacing all single wall with double wall. Gas flex ran into furnace, against code, recommend running black gas pipe into manifold to meet requirements.
