Pool is brand new with a Jandy LX400 heater for the spa. When I go to turn the heater on in the evening, it will attempt to fire 3 times (going through the normal firing cycle of 15 second flush, 15 second ingition, 15 second flame). But the first 5 or 6 times, the firing shuts down with an "AGS" warning (auto gas shutoff). The jandy manual says the most likely cause is fluctuating water pressure, or a variety of other reasons. However, after the 5th or 6th time, the firing "catches" and burns until the spa is at the right temp.

Is this a case of a new heater needing a "break-in" period, before it'll "catch" on the first firing? Once it fires, it does a great job, but I hate having to stand over it and reset it each time it gets the AGS warning and shuts down.