Heater shuts down during heavy rain or after being sprayed by irrigation.

Safety first: Turn off power before opening the cabinet. Do not operate the heater with water inside the control compartment.

Step-by-step checks:

• Inspect for water: Open the control compartment and look for water droplets, rust trails, or wet insulation. Dry all components with a clean cloth and allow to air dry.
• Seal openings: Replace missing grommets and use appropriate weatherproofing around cable entries and panel joints, following Pahlen guidelines.
• Redirect sprinklers: Adjust irrigation heads so they do not spray the heater.
• Add cover (if allowed): Install a manufacturer-approved rain hood or shelter that does not restrict combustion air or flue exhaust.

When to stop: If water has entered the control board or gas valve, have a technician inspect for damage before restoring power.