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The Home Depot

Why is My Hot Tub Not Heating Up?

Pro Referral > Home Guides > Pool and Hot Tub > Why is My Hot Tub Not Heating Up?
Why is My Hot Tub Not Heating Up?

A cold hot tub isn’t cool. When your hot tub starts getting hot, the best thing you can do is call in an experienced professional to fix it. That’s because hot tubs run on electricity – and it’s never a good idea to tamper with electrical wiring and heating elements unless you really know what you are doing. However, it doesn’t hurt to know a bit about how your appliance works so that you aren’t completely in the dark.


We have assembled some of the things you should know about and can check when troubleshooting your problem. Remember – a pro is best, but a little education never hurt anybody!

  1. 1. Limit switch

    The high limit switch is a safety device. It tells the hot tub to shut off if the temperature goes over 120 degrees Fahrenheit. The problem could be that the temperature in your tub actually got too high. Or, the switch itself could be malfunctioning.

  2. 2. Pilot

    If your tub is gas powered, the pilot light could be the problem. Check to see if it has gone out.

  3. 3. Pump

    The pump helps move water to your heating element. However, if the pump isn’t working that can’t happen. Also, a malfunctioning pump could be indicative of a system-wide problem. You would need a professional to investigate it and get to its root.

  4. 4. Heating element

    The heating element makes sure your tub is warm and toasty. Make sure that the heater is on. If you can, check to see if all the connections are in place and that the element doesn’t appear damaged.

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