Pool and Spa
Questions about Pool Repair? Ask an Expert Online.
Here is a link to the wiring on most Nordic spas this will show you where the thermostat wires should be connected on the circuit board.
OH ok sorry you stated thermostat but the high limit plugs in next to it. As for the spa not heating...have you tested power at the heater itself? The only items other than the heater that will be affected is the High limit, thermostat, pressure switch/flow switch, these are the safety switches that can keep a heater from heating. If there is good flow of water through the heater then we know the pump is good. From here check the thermostat and high limit. If none of these seem to resolve issue then we have to look into the circuit board being the issue because the circuit board is designed to turn the pumps on high speed for a short period of time but it sounds like your board is malfunctioning. Be sure everything is plugged into board securely and that the pump has good flow of water.