heater problem

[jomoore]

I own 2006 J385 Jacuzzi LED spa. It should heat as needed with circ pump working. Will only heat with pump 1 on or filter cycle. Circ pump pushes water. Tub will not reach set heat of 102 sits on 95,96 degrees. Filters look good. Anybody got an idea? Thanks.
Jomoore

[MaryH]

First try removing the filter after you make sure there is nothing floating in the water that could get sucked into the filter system. Even though it looks clean it may have oils or something clogging it enough not to allow the circulation pump to draw enough water through to allow the heater to come on. So when it is removed and main pump is off turn thermostat all the way up to see if the heat indicator comes on. If it does then I would replace the filter with a new one.