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is displayed temp less than 2 degrees than setpoint temperature ? its possible this situation will disallow the pump to go to high speed and the air infusers to work till spa heats back up , or can be a heater fault as well
im gonna assume your referring to the parts that make a spa work ,
1st theres the main pump most times there centrifugal pumps with mechanical shaft seals , this pump moves water in thru the filters and out the nozzles around pool ,most spa's have a two or more speed motor that runs this pump
2nd some spa's (not all) have a second pump usually smaller these are for the heating circuits , they are also centrifugal and use mechanical or magnetic seals these pumps also intake thru the filters and push water thru the heating elements and also the water conditioner (UV) and on some spa's its also a means to add water treatment chemicals as well
3rd and last but not least theres the blower now not all spa's have one of these , but most do , this blower blows air into the main nozzles exit ports and make the wonderfull bubbles in the spa , now some spa's don't have a blower and use a process called venturi to draw air into a nozzle as water is forced out of it , but this type of system is a bit temperamental and is difficult to keep working well ,
blower motors also have adjustable speeds to adjust the amount of bubbles in spa
Sounds like you have air pump plugged in the wrong place on the control pack. unplug them all then plug them in one at a time till you find the correct ones. the pump should come on when you press heat and the bubbles when you press air/bubbles. Not a big deal, just have stuff plugged in the wrong receptacles.
controls operate the pump to circulate the water..there are controls for bubbles and an air pump to increase the volume of the bubbles..and a setting to run the tub slower to allow heating of the water..
Don't know your geographic location, but where I am we've been in the single digit temperatures for three days. Everything that can freeze has frozen.
If you are in a similar area, even though the water in the spa (I'm assuming the spa pump is being used on a spa) is heated, the pump housing isn't. If it iced up, it could very well cause the problems you describe.
Comment back with some more detail before I continue down what might be the wrong path.
upper spa side control should have a heat lite, if on then heater is recieving voltage. Sometimes pump can have an air bubble in line.
Make sure water is flowing from jet. Spa will not lite heater without water flow. If no water try loosing union after pump to pull air through, so pump can fill with water, and no longer cavitate. Kirk