pentair mastertemp

I have a Pentair MasterTemp 400K BTU Heater that is under warranty (pool startup was Thanksgiving 2021...so ~21 months ago). It recently started leaking, and the technician came out yesterday and confirmed that it is totaled. He pulled off the heater manifold, and the copper tubing had corroded...

Hello, I have a Pentair Mastertemp 400 (almost 6 years old). I have been getting as service heater light (solid red light on the Fenwal Ignition Controller module - Control Fault). The heater will run normally about 50% of the time that we use it. On the occasions that the service heater light...

Hello, I'm hoping someone can help. Through my iAqualink app on my phone I'm able to turn on my heater when in Spa and Pool Mode. I am unable to control the temperature (up or down) of the heater though. The heater set temp stays at 95 degrees. Does anyone have any idea what the issue could...

Hi, Everything in my Pentair Mastertemp Heater is working properly except the LCD screen that displays the temp. I can see that the backlight is coming on but there is no display of numbers. All buttons on pad work as normal and from reading other threads I realize the LCD screen is on the...

I have a mastertemp 400 HD heater and I'm having an issue with maintaining the temp. Initially when you turn it on, it stays on and heats it up well. However once it reaches the set temp, it will shut off Rapidly instead of staying on for a few minutes to heat it back up to a degree or two over...

I have a MasterTemp 400 that I have been troubleshooting since last year. I've check different foruns and looks like a common issue, but I have yet to see a resolution. Perhaps you can help. As soon as I turn the heat on, I see a 75 reading. It 'heat' blinks to call for heat and then steady...

Hi all- I've got some time at home now with self-isolation, so I'm working on my pool equipment. My 8-year-old Mastertemp 400 won't stay lit. It's not throwing any diagnostic codes- the burner fires, but it smells bad like it is not burning right, and it even sounds wrong (deep rumble- more...