Pool heat pump

Hi, I have a  waterco electroheat pool heat pump and it’s not heating my pool anymore… it was up to 82.4 F a few days back and the nights haven’t been any colder then 55 and days are in the high 70’s low  90’s but it’s down to 70.16 now… I figured it would go down a bit through  the nights since I have no pool cover but that seems a bit extreme… could anyone tell me what would cause this… the heating coils are cold to the touch which I assume shouldn’t be the case…thanks