I have a Hayward H400FD heater that is throwing a PF error code which is supposed to indicate a wiring/low voltage error. It's wired 240v so the 120v reverse polarity isn't an issue. I have tested line to line and get 240v. I have tested line to ground and get 120v and 119.5v. So from what I can tell it should be working. Anybody out there have any ideas about what to look at next?
Thanks in advance.