Heater will not ignite; display shows IF shortly after a call for heat; blower may run but no flame is established.

Safety First: Turn off power at the breaker and shut off the gas supply before opening the heater. Allow the unit to cool completely.

• Check gas supply: Verify the gas valve feeding the Hayward heater is fully open. If other gas appliances are weak, contact your gas supplier.
• Inspect the igniter: Remove the front panel, locate the hot surface igniter (usually near the burner tray). Look for cracks, white spots, or breaks in the element. If damaged, replace the igniter with a Hayward-compatible part.
• Clean the flame sensor: The flame sensor rod sits in the burner flame. Gently clean it with fine steel wool or emery cloth to remove oxidation, then reinstall firmly.
• Check wiring connections: Inspect the harness to the ignition control module, igniter, and gas valve for loose or corroded connectors. Reseat all plugs.
• Reset and test: Restore power and gas, clear any lockout per the manual (often by cycling power), then call for heat and observe ignition. If IF returns, a professional should check gas pressure and ignition control.