I have a Hayward H100id1 natural gas heater for a 16'x24' above ground pool.
The gas does not light reliably. I put a voltmeter on the wires going to the gas valve. The voltage was 120VAC which was correct per the electrical diagram. I assumed that the valve was bad so I replaced it. $222. The heater fired up after that. Now, week later, it is igniting intermittantly. The fan starts, I can hear the ignitor sparking, but no ignition. The voltage is reading 120VAC. Anyone have this type of failure.
Background on heater.
Installed 5/2006. Had to have a service tech out just after installation as it would fire up but stop almost immediately. There was too much air entering the combustion chamber and the flame would blow out. Caulk over some of the holes fixed that problem.
2 years later the diverter inside the heat exchanger broke loose. This allowed the water to flow through the main pipe but did not force the water to flow through the heat exchanger. This casued boiling in the heat exchanger which made a banging sound like rocks were passing through the heater. The brazed connection points of this diverter were very small and vibrations of the diverter eventually caused them to fail. Replacement core $450. I repaired the core instead. I did not braze it, but a radiator shop may be able to fix it if you have this type of failure or a leak or crack. Still makes a few "bangs" when the heater first ignites and then goes quite. This year the gas is not igniting.