No heat

[zonibeach]

I've replaced the heating element and the temperature pressure switch and can only get water up to 77 degrees. Before I swapped out my old temp pressure switch I screwed the top adjustment screw all of the way down and the temp went up to 99. Now after swapping it for a new one the water only heats to 77. Any thoughts?

[Mary]

Does the heat indicator light or symbol come on when you turn the thermostat up for a heat call? Have you tried removing the spa filter to see if the heater comes on? Usually pressure switches are factory set and don't need adjusted. It could be a bad thermostat, or relay on the circuit board causing this as well. That is why I need to know if the indicator comes on in a heat call.

[Randyh03]

I have basically the same problem and have no heat indicator light on. Removing the spa filter does not make a difference in this situation. Can you help?