I have a Jandy LRX natural gas heater for an inground pool that's about two years old. It's operated by the millivolt system. The pilot light stays lit all the time so I know it's getting gas. Our furnace for our house runs fine.
When I turn the heater on it lights up and stays on for two seconds then goes out. It will cycle like this forever as long as I leave the thermostat turned up and the heater turned on. Any ideas what may be causing this?