hayward h400

I have a 10 year old Hayward H400 FDN pool heater. It’s worked flawlessly for the first 10 years. This season I had IF (ignition fault) error and replaced the flame sensor because it would fire up but go out after about 30 seconds repeatedly. After doing this it fired up and continued to run. By...

Hi everyone. I am a new pool owner (came with the house). It is an inground saltwater gunite pool with an attached spa and it is approximately 10 years old. Last year we had a brand new Hayward H400 heater installed and during the offseason we replaced our filter and salt generator. The new...

Looking for help! I have an H400FDN that is a 4 years old and has always worked perfectly. The other day we turned it on as normal to enjoy a spring pool day. The heater turned on, lit the natural gas as normal. An hour or so later, we noticed the heater was running, but wasn’t heating the...