Heater lights briefly then shuts down; display shows SPF2

Safety warning: Gas work can be hazardous. Do not adjust gas supply pressure yourself. Shut off power and gas before opening the heater.

• Check gas supply: Confirm that the gas shutoff valve to the SmartPool heater is fully open. Make sure other gas appliances are not starving the line when they run.
• Inspect burner area: Remove the front panel and visually inspect the burner tray for rust flakes, spider webs, or debris. Vacuum gently around burners and orifices without disturbing wiring.
• Check venting and airflow: Ensure the heater exhaust is not blocked and that intake louvers on the cabinet are clear of leaves, plastic, or dirt. Restricted airflow can destabilize the flame.
• Observe ignition (if safe): With the panel temporarily off and gas/power restored, call for heat and watch the flame through the sight glass. If the flame is weak, lifting, or blowing out, shut down and call a technician to check gas pressure and combustion setup.
• Do not bypass safeties: Never jumper flame sensor or gas valve circuits to force operation. This is extremely dangerous.