What Do Hot Tub Error Codes Mean?

Codes vary by brand

Spa control systems come from several different manufacturers, and each one uses its own short list of letters for error codes. The codes below are common across many brands, but the exact letters and the fix can differ from one system to the next.

Your owner's manual is the real answer key for your spa. If you do not have a paper copy, the manufacturer's website usually has one to download, often listed by model or control panel type.

Write down the exact code and when it appeared, like right after a fill or during a cold snap. That detail helps a lot if you end up calling for service, since it points a technician in the right direction fast.

Overheat and temperature codes

Codes like OH, OHH, or OHS point to the water getting hotter than the system allows. This is a safety shutoff, not a glitch, and it is the system doing exactly what it is supposed to do.

Open the cover to let heat escape, and check that the filter and jets are not blocked, which can trap hot water near the heater. Let the water cool before you try to restart the spa.

If this code shows up on a hot day or right after a long soak session, it may simply be the system catching up. If it happens with no clear reason, treat it as worth a closer look.

Flow and dry codes

FLO, FL, FL1, or FL2 codes mean the system is not sensing enough water movement through the heater. DR or DRY codes mean the heater thinks it does not have water around it at all.

Check the water level first, it may have dropped below the intake. Then check that filters are not so dirty they are blocking flow, and that all valves are open and set correctly.

These codes exist to protect the heater from running without proper water flow, so do not try to bypass them. Fix the underlying cause instead.

• Low water level is the most common cause
• A clogged filter can also trigger these codes
• Air trapped in the lines after a refill can cause a false reading
• A closed or partly closed valve can restrict flow enough to trigger a code

Sensor and limit codes

HL means the water hit the system's high limit, another safety shutoff. SN, SNA, or SNB codes point to a problem with a temperature sensor itself, not the water temperature.

COOL or ICE codes usually appear in cold weather and mean the system sees water temperature dropping toward freezing, so it is running the pump to keep water moving and prevent ice from forming in the lines.

Sensor codes in particular are hard to diagnose without the right tools, since the sensor may be giving a false reading rather than reporting a real problem with the water.

When to stop and call for service

Try the simple fixes once: check water level, check the filter, and make sure power to the spa is steady. If the same code keeps coming back after that, stop trying to clear it yourself.

Text our service team a photo of the code on your display and we can help you figure out next steps. We work on hot tubs of any brand, so do not worry if yours is not one we sell.

It is always better to pause and ask than to keep resetting a system that is trying to protect itself and the equipment inside it.

• PR or similar priming codes often need a pump re-prime
• HFL can point to a heater flow problem that needs a closer look
• A code that returns right after a reset usually needs a technician
• Any code paired with a burning smell means power off and call right away

Keep your manual handy

A photo of your owner's manual's error code page, saved on your phone, is one of the simplest things you can do. It means you are never stuck outside trying to remember what a code means.

If your spa did not come with a manual, our team can often help you find one or identify your control system from a photo of the panel.

Keeping the manual, or at least a photo of it, with your other household paperwork means it is there the one time you really need it in a hurry.