I have a Bock 80 gallon commercial water heater with a spark igniter that is just over a year old. Of course its out of warranty
Every so often, it would spark several times, but the burner will not fire up. It will do this a few attempts till it goes into lockout mode so I will have to power cycle it and then it will be fine for a few days.
I had the igniter and ground rod cleaned but it seems like its still doing it every so often. Any ideas? Thank you!

I had the igniter and ground rod cleaned but it seems like its still doing it every so often. Any ideas? Thank you!