heater short cycle

Hello, I am new to this group and a new pool owner as I just bought a house. My kids were very excited about the hot tub in this new house and sadly it is not operating correctly. The pool has a Pentair MiniMax 400. This is an old model heater. This heater only has one service light and it...

Need help diagnosing. Long story… My mastertemp 400 sprung a leak in the exchanger about 2 years ago. I patched it with JBweld and it held until a week ago when my heater stopped working as the patch failed. I bought a new heat exchanger, and when I went to replace it, noticed the combustion...

I need help trouble shooting my Sta-Rite SR333HD heater. Problem: Heater runs for ~3min, gas shuts off blower stays on, system reignites, runs for 15sec, gas shuts off, repeats run/shutoff cycle 5-6 times then system shuts down and service heater LED comes on. During this time hot water is...

Hello, I have a Mastertemp 400 that is short cycling (heats for 30-40 seconds then stops for 30-40 seconds, rinse and repeat). I have replaced the Control Board, HLS, AGS and Stack Flue Sensor. The Thermistor appears to be functioning (reporting correct water temp at the heater display) and...