Hello,

Thank you for the great advice on the other topic posted. We have replaced both the circulation pump and the heater, yet the hot tub is not getting hot. Does anyone have any suggestions? We do not know what else to try. We have new filters as well. Thank you!

EDIT:

OK, it's a 1995 Grandee.

A few things to check... Is the 30 amp breaker good? Is the flow switch working properly? Have you OHM'd out the thermistors?
When you replaced the heater I'm assuming you used a new PDR No-Fault? If so, you can safely by-pass the flow switch, just put a jumper in the flow switch receptacle.