Zodiac pool heater shuts down when it rains or in very humid conditions.

Safety: Turn off power before opening the heater in wet conditions. Avoid working on live circuits when moisture is present.

• Inspect cabinet seals: Check door gaskets, panel overlaps, and any penetrations for gaps that allow water in. Replace worn gaskets and seal openings as recommended by Zodiac.
• Check vent and intake: Ensure the vent cap is intact and properly installed. Verify that rainwater cannot run directly into the exhaust or intake.
• Dry components: If moisture is found on the control board or sensors, allow them to dry completely before restoring power. Use gentle airflow, not direct heat.
• Relocate or shield: If the heater is installed where it is directly exposed to sprinklers or roof runoff, correct the source or add shielding per code.
• Replace damaged parts: Corroded boards or sensors affected by repeated moisture may need replacement.