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Step Two: Voltage

If everything works "but..." then one of 3 things has caused the "thing" to not operate. Most homeowners will assume that its the component itself which may be. But you need to know how to use a voltmeter to really know. Otherwise you are guessing and may or may not be right.

In reality, the on/off button, pcboard, component, or cords could be the issue. Only way to know is check the component when it "should" be ON. Components are either 115v or 230v (some are 12v but that is unusual).

Checking voltage can be dangerous. If you do have experience doing so it makes sense to have someone who is perform these test. Otherwise you run the possibility of harming yourself or further damaging your hot tub.

For help indentifing where to check voltage see "How To" link. But basically you want to check at 3 points. First, incoming power. Confirm you have correct voltage. You will test white+black on spas operating on 115v and black+red on spas operating on 230v. For the white+black you must have 110-120vac. For red+black you must have 220-240vac. In both cases, you MUST see the voltage on the meter. Do not try any "tricks".

Once confirm the incoming power is correct, check the power that is going to the component. Same principle as above. If you do NOT have power at the control box to the component, then we think topside failure or board failure. If you DO have correct voltage, then the fault can be in the cord (rare) or the component. Only way to be sure is check the voltage where the cord goes into the component. If correct voltage IS going to component, component has failed.

See Step Three for voltage check that shows the board IS NOT applying current to the component.