My heat pump is currently throwing an HP error and as I wait for authorized repair to check, I am trying to troubleshoot. Here is my setup:
Bottom Drain (2")
Skimmer A (2")
Skimmer B (2")
Return A (1.5")
Return B (1.5")
I have a Hayward 1HP dual speed super pump and a 244T sand filter. When on high, my pressure at filter reads 21psi, which is where it stays when things are running clean.
If I have drain and both skimmers open and attempt to start the heat pump, it will start and once compression kicks on, stop and throw the HP error. If I valve all off but one of the skimmers, heat pump works fine. Another test was to open all valves for drain/skimmers, but have the multiport valve on circulate. In this setup, the heat pump works fine, no error. During all these setups, the pressure remains the same at 21psi.
I have no visible leaks (no air bubbles in pump basket area. Any recommendations of other things to try prior to repairman getting here. It may just be a faulty switch on heat pump, but want to make sure I am not missing anything. I guess my biggest gripe is that I really want the bottom drains circulating while heating to get the cool water off the bottom of the pool.