e05

I've been scratching my head over this for a week now. I have 2 400k pool heaters for my pool. They both worked fine over the summer. Last year I had to replace the SFS sensor on one of them. The same one, a year later almost to the day, started acting up again. It starts heating, sometimes the...

Hello, yesterday I started getting an E05 error on my Pentair master temp 400 HD. I opened the heater up and put a multimeter across the flue temperature sensor and I got 3.8 ohms. So I’m assuming that the temperature sensor is OK. The air intake is also fine and from what I can tell the water...

Hello All, I know there are many threads re this issue but here goes... I have a Mastertemp 400 natural gas heater that was winterized in perfect working order at the end of last pool season. Attempts to start it up this year has resulted in the heater starting as usual and shutting down...

Hi all, I've read a copious amount of threads about the E05 error however thought to ask one last time before spending the $300 for the control board. I get the SFS light and the "push ON" reading just stays at 80 then comes the E05. This is after the heater ignites and seems to run just fine -...