It’s on, it’s working, but the pool just isn’t as warm as it should be, or it’s on but an error keeps popping up and switching the unit off.(identify the error code using the manual or contact an agent for error code listing).Low water flow is by far the most common error, and this is due to high “Gas” pressure caused by a poor heat exchange rate…in short…. low water flow.
Check and ensure that all shut off valves to and from the heat pump are open, check that the pool pump is working correctly and that all filters are clean and free of debris.