pentair mastertemp 400

Last week I tried to heat my pool spa and noticed the heater wasn’t working. I havr a Pentair MasterTemp 400 and when I switch the system to spa, the heater turns on and looks like it’s starting to go through the process…(displays 128, displays an “r13” code, displays “service system”, then...

Hi! I have a Pentari 400 mastertemp NA and the combustion chamber was filled with water, so I need to replace the coil assembly kit and I want to know whether I could use this as an opportunity to then upgrade from the 474061 Tube Sheet Coil Assembly Kit that is specific to the 400NA and...