Zodiac pool heater leaks water from the bottom of the cabinet.

Safety: Turn off power and gas. Close isolation valves to the heater if installed. Water leaks can damage electrical components.

• Identify leak source: Remove the front and side panels and inspect around the heat exchanger, headers, and plumbing unions while the pump is running.
• Check unions and fittings: Tighten loose unions and fittings on the inlet and outlet. Replace O-rings or gaskets if leaking at connections.
• Inspect heat exchanger: Look for visible corrosion, green/blue staining, or active dripping from the exchanger tubes or header joints.
• Assess freeze damage: If the heater was exposed to freezing temperatures without proper winterization, cracks in the exchanger or manifold are likely and require replacement.
• Replace components: A leaking heat exchanger or header typically must be replaced with Zodiac OEM parts by a professional due to gas and combustion sealing requirements.