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Well you solved it - The gas pressure was very high and could not be adjusted with the gas valve - It turned out that the problem was a faulty pressure regulator in the pool plumbing outside the heater.

Forgot to note that I found two dead critters behind control PCB (see picture). No sign of obvious short on PCB, but bottom slo-blo fuse was blown on power board (replaced)

Thank you for your reply. I am not certain of the heater age (I recently purchased this home) but I would guess it is about 6-8 years old. It last worked approximately 3 months ago (last time we used spa). I will post pictures as requested I did check input gas pressure (before changing...

Looking for ideas – IF error. Hayward W3H400FDN. Symptoms – runs sensor checks, fan spins up, ignitor glows, gas flows, but no flame (no heat at vent and no whoosh from burner light-off). Runs 3x then IF failure. I took Omni-logic connections off to eliminate this as an option. What I have...