pressure switch

Hi all, Novice repair person here. My Hayward spa heater (installed 2018) is not heating the water and is displaying this LO code. I have read every troubleshooting guide and watched every video I could find. My diagnostics included: 1. Cleaned the filters, even ran the pump without the...

When I turned the pump off (not realizing the heater was running), the heater started to shake and rumble. I quickly turned it off. I followed the pressure switch adjustment procedure, but it did not work. I replaced the switch - That also did not work. The control panel used to indicated...

We just bought a house and have been having problems with our heater it is very inconsistent. We were told to replace the pressure switch however it is obselete and the new one is not the same size and requires a bushing to connect. We did this and now the heater doesn’t worm at all. Anyone else...