You did not state IF you have the Aqua Hot system activated and ON. Heat Pumps are completely separate from the furnace/water heater system(Aqua Hot). IF you did not have the Aqua Hot activated and you are NOT inside storage, you may have a burst Aqua Hot reservoir if the Propylene is not at the correct antifreeze concentration. On your HP system, IF the Aqua Hot was activated, then the Aqua Hot furnace system would have come on once the ambient temp dropped below 36/38 degrees. Doug