I cleaned the burners, igniter, and flame sensor. The igniter does glow. The fan comes on. Gas flows. The burners will not light. After 3 tries, I get 1F code. Why won't it light?
SOURCE: Hayward H Series 400,000 BTU Pool Heater Won't Ignite
You can not manually light it. Open the front cover look for the gas nozzles brass looking on a tube. on the right side you will see a wire going to a sensor above the next to last burner take the nozzle out for that burner. 7/16 wrench unsrcew the nozzle and see if it is clogged. use something soft to push it out. Spiders love to lay eggs in these. Spray with WD40 and reassemble should work now
Best of luck
SOURCE: Pilot light on H Series Hayward pool heater wont
You might need to have your gas lines cleaned. If there is a blockage of the gas line, you might not be getting enough fuel to start the heater. If that doesn't solve the problem, try consulting the owners manual for these pool heaters. The troubleshooting guide might help you narrow down the problem.
http://www.backyardcitypools.com/images/Hayward/H100-Manual.pdf
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