flame sensor

I am not a pool guy, but have a lot of knoledge of home heating systems. I have a Pentair MasterTemp 400 heater that sometimes fails to start up properly. The process is you can hear it start up, the blower motor turns on, the gas valve clicks open, the heater lights (you can feel hot air out...

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...

I wanted to document this on the forum threads since this issue got diagnosed and solved via PM. First, let me give total credit to our esteemed forum expert @JamesW for helping me to diagnose, test and fix this heater issue. James' help saved me from calling in a "pool service" guy and...