Jacuzzi pool heater emits a strong chemical or burning smell during operation.

Safety first: Turn off power and gas immediately. Do not continue to operate the heater if you smell burning plastic or wiring.

Steps to investigate:

• Visual inspection: After the heater cools, remove the front panel and inspect for melted plastic, leaves, or other debris on or near the heat exchanger and burners.
• Check wiring: Look for discolored, brittle, or melted wire insulation. Replace any damaged wiring harnesses.
• Combustion check (professional): Soot or a sharp exhaust odor indicates poor combustion. A technician should clean the burners and verify gas pressure and air supply.

Do not ignore persistent odors; they can indicate a fire or carbon monoxide risk.