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The heat sensor in the tub may be faulty. The heating element may be broken, but most of the time when this happens the breaker will through. If the tub has a circulation pump that is not working it will not close the in line flow sensor which will not alow the heater to come on due to low flow. Many flow sensors are clear and you can see it close when the system is running. check out these, and then replace whatever is broken.

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Q: Whirlpool Hot tub it will not heat the water what could be wrong?
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