Hi there, turned on our heat pump two days ago because we're going to have a warm week with temps in the 70's. I've been hearing a short low pitch alarm signal about once every two minutes. Nothing shows up on the display as far as any specific alarm message. The fan is running. The pool temp has increased 6 degrees over the last two days from 50 to 56 degrees. We don't have a cover. Also, I have seen no condensation whatsoever being produced. Would anyone have any idea what that alarm might be signifying and what the issue might be? Thanks!