• Wellis

How to fix spa water heating issues?

Updated: Apr 20

Have you ever had a problem with your hot tub temperature fluctuating? Or maybe it's not heating at all? There are 3 common issues that happen:

  1. If your hot tub won't stay hot: your filters could need cleaning or your plumbing may be clogged

  2. If your hot tub temperature fluctuates: you may have an issue with your thermostat or heat sensor

  3. If your hot tub won't heat at all: you may have a bad heating element.


The 1st issue you can fix yourself: make sure your filter isn’t clogged, if you find debris clear it out and give it a good cleaning. If the filter is not the problem, check the thermostat and heat sensors. Sometimes they could break down or burn out. And finally check the circulation. If your plumbing is clogged your water cannot circulate properly and this could cause the water to cool down like bath water. If this is the case you’ll need to drain and clean your hot tub and use a line flush product to clear the plumbing.


With the 2nd problem, your hot tub temperature is fluctuating between hot-cold-then hot again, sometimes even too hot. This event is usually caused by a temperature sensor which is starting to die. If this is not the case, the problem could be with the thermostat. Whichever is behind the issue, you’ll need to call an expert to help you out because the part needs to be replaced.


When your spa doesn’t want to heat at all, then this could be caused by the low flow from your hot tub pump, which is then needs to be replaced. The lack of heat could also be due to a bad heating element. When this happens there is no fix, again you’ll have to replace it. Luckily heating elements are not expensive and quick to fix.


If you suspect the latter two options could cause your water’s heating issue, or you cannot identify the problem, we advise you to get in touch with us to check your spa.




Credit: Swim University


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