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If your hot tub is flashing an error code, don’t panic! These codes are there to tell you what’s wrong so you can fix it fast and get back to relaxing. In this guide, we’ll go over the most common hot tub error codes, what they mean, and how you can solve the problem.
Common Hot Tub Error Codes (And What They Mean)
Here are some of the most common error codes you might see, along with simple explanations:
OH or OHH – Overheat
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What it means: Your hot tub is too hot.
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Fix it: Turn off the spa and let it cool down. Make sure the cover is off and filters are clean. If it keeps happening, you might need a new temperature sensor or heater.
FL, FLO, or FL1 – Flow Error
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What it means: Water isn’t flowing properly.
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Fix it: Check for dirty filters, low water level, or an airlock. You might also need to check the circulation pump or flow switch.
SN, SN1, or SNS – Sensor Error
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What it means: One of your sensors isn’t working right.
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Fix it: Check connections, inspect the temperature and high-limit sensors, and replace if needed.
DR or DRY – Dry Heater
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What it means: The heater is on, but there’s not enough water.
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Fix it: Make sure the spa is full of water, filters are clean, and pumps are primed. Never run the heater with low water—it can burn out!
Prr or PR – Priming Mode
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What it means: Your spa just started up and is in priming mode.
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Fix it: This isn’t really an error! Just let it finish its priming cycle, or follow your spa manual to help it along.
Why Understanding Error Codes Matters
Fixing hot tub problems early can save you from bigger (and more expensive) repairs later. Most error codes are caused by simple things like:
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Dirty filters
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Low water level
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Airlocks in the system
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Failing sensors or pumps
At Spa Parts Experts, we help you get the right part the first time—no guesswork, just expert advice.