Pentair MiniMax NT 400 DV heater.When it's first started seems to work for several minutes then starts cycling. Comes on then after about a min shuts down and goes through normal start process again
Replaced the thermistor and now it runs for about min and half and then the heat light starts to blink and then can hear gas valve clicking a few times and finally shuts off, service light comes on and goes through start cycle again, fires up and repeats the whole processs again. This goes on as long as I have heater on.
Pool & Spa - Pentair