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Step Two: Voltage

If everything works "but xxx" 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 NOT have experience with electricity it makes sense to have someone who is perform these test. Otherwise you run the possibility of harming yourself or causing further damage to your hot tub.

For help identifying where to check voltage see "How To". Basically you want to check 3 points. First, incoming power. Confirm you have correct voltage. For spas operating on incoming 110-130vac, you will test white+black at the control box incoming terminal. YOur voltmeter will give you a 110-130vac reading. If so, you are good. If not you have an electrical problem

On spas operating on 220-240v you have 2 possible incoming setups: 3 wire which is 2 Hots (black and black or black and red) and a ground wire. To test that you set meter for above 300vac. Place a probe on each hot leads. You MUST have 220-240vac. If you have -0- you have failed incoming power.

On spas with FOUR incoming wires; Black, Red, White, and Ground, you must perform this test. With meter set to 300vac or higher, place a probe on Black and Red. You MUST have 220-240vac. If -0- you have an incoming electrical problem. If yes, you likely are fine.

Once confirm the incoming power is correct, check the power that is going to the component in question. 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. Let me also note on some pcboards they build a little LED light on the board to help you identify failed circuits. Also some manufacturers build a LED light in the component cord so if the power IS present in glows. But experience has shown us that testing with a meter is always best.

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