Heater cabinet shows signs of rust, corrosion, or paint blistering around the exhaust area.

Safety first: Turn off power and gas before inspecting the exhaust path.

• Check venting: Ensure the Kripsol exhaust vent is properly installed, sealed, and terminates in a location that prevents recirculation into the intake.
• Raise return temperature: Avoid operating the heater with extremely cold water. Use a bypass to mix some warm water into the return if necessary.
• Relocate chemicals: Store chlorine and acid containers away from the heater to reduce corrosive fumes.
• Inspect for leaks: Look for cracks or gaps in the flue collector or manifold. Replace damaged Kripsol flue components.
• Surface treatment: After correcting the cause, clean and repaint affected cabinet areas with corrosion-resistant paint if structurally sound.