I can hear the motor running, but there is no circulation or heat. What is going on?

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I can hear the motor running, but there is no circulation or heat. What is going on?

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First, check your filter. A severely clogged filter can greatly restrict water flow, and with little or no flow, there will be no heat either. Try running the spa with filter out. If water now circulates properly, replace your filter(s). Another frequent cause is an air lock in the pump, especially if you just drained your hot tub. To clear an air lock, first locate and close the valve on the intake side of your pump. Then, on the outflow side of the pump, loosen the pipe union just enough turns to allow the trapped air to escape and fill with water. Retighten union, open intake valve, and run spa to verify correction of the problem. If an air lock or clogged filter proves not to be the culprit, the cause could be blocked plumbing, or a damaged or obstructed impeller blade.

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