Decoding Jacuzzi®️ Hot Tub Error Codes – Comprehensive Guide

Are you facing some perplexing issues with your Jacuzzi®️ hot tub? Don’t worry–we’re here to guide you through the cryptic world of hot tub error codes.

At Fix My Hot Tub, we understand that these error codes can be frustrating, especially if you don’t know what they mean.

That’s why we’ve created this comprehensive guide to help you decode those enigmatic messages that your hot tub is sending you.

So sit back and let’s unravel the mysteries of Jacuzzi®️ hot tub error codes together.

Understanding the Importance of Hot Tub Error Codes: Why Your Spa Uses Them

Imagine this scenario: you’re looking forward to a relaxing evening in your Jacuzzi®️ hot tub, only to be faced with an error code flashing on the control panel.

Frustrating, right? But fear not! Those mysterious hot tub error codes are actually there to help you.

Error codes are a vital communication tool that your spa uses to indicate any issues and problems it may be experiencing.

Instead of leaving you to guess what’s wrong, these codes provide specific information about the nature of the problem.

By understanding how to interpret them, you can effectively troubleshoot and resolve issues – often without the need for professional assistance.

So, why does your Jacuzzi®️ hot tub utilize error codes in the first place? There are several benefits to using these codes for troubleshooting and repairs. 

  • Efficient troubleshooting: Error codes provide a quick way to identify and understand the underlying issue in your hot tub. No more struggling to diagnose a problem based on vague symptoms. With the help of hot tub error codes, you can pinpoint the exact source of trouble.
  • Cost-effective repairs: By utilizing error codes, you can resolve minor issues on your own, saving money on service calls. Knowledge is power, and understanding the hot tub error codes empowers you to tackle simple repairs yourself, without needing to hire a professional technician.
  • Preventative maintenance: Error codes can also guide you in performing regular preventative maintenance tasks. By addressing small issues promptly, you can prevent them from escalating into more significant problems. This proactive approach will help keep your hot tub running smoothly and extend its lifespan.
  • Easy communication: Many hot tub error codes are in your Jacuzzi®️ Owner’s manual. While the screen has limited room to give you information, each code will prompt you to check your owner’s manual for more information. Don’t have yours on hand? No problem! We have many Jacuzzi®️ hot tub manuals available to download.

Next, let’s explore how you can effectively use error codes to diagnose problems with your hot tub. Stay tuned!

hot tub error codes

Hot Tub Error Codes 101: Common Codes & Troubleshooting

Understanding the error codes that pop up on your hot tub is essential for troubleshooting and resolving any issues.

By knowing what each error code means, you can address the issue quickly and effectively.

In this section, we will break down some of the most common hot tub error codes you may encounter and provide detailed explanations for each.


This code simply means that the temperature of your water has decreased by 20°F (11°C) below the set temperature.

To adjust, both the circulation pump and the heater are now working to increase the temperature to within 15°F (8°C) of the desired setting.

Next Steps: No intervention is needed. This situation frequently occurs when filling the system for the first time or during refills, as tap water is typically quite cold.

If it isn’t a newly filled tub or the tub’s power has not just been turned back on, customers should check to see if they have an economy mode set. If this is the case. You may need to reset Auto Heating Mode.

If the economy mode is not set, then they should take note of the current temperature–if the heater light is on (a light, or flame icon, depending on the model and year), and check again in a few hours. If the tub says it’s heating, but the temperature isn’t rising, call for service.

2. ICE

This indicates that the water temperature has fallen below 55°F (12.78°C), and the system has identified a possible freezing condition.

To prevent freezing, Jets Pump 1, Jets Pump 2, and the circulation pump will turn on for 10 minutes and then shut off, followed by the circulation pump and heater.

These cycles will continue to repeat until the water temperature rises to 65°F (18.33°C).

Next Steps: No intervention is needed, however you should monitor your spa to ensure your water temperature rises.

3. SN Codes


The high-limit temperature sensor is malfunctioning, either due to an open sensor (which disables the heater) or a shorted sensor (leading to spa deactivation).

Next Steps: It is necessary to get in touch with your authorized Jacuzzi®️ dealer or a qualified service technician for assistance.


The temperature sensor is not working properly due to being open or shorted, resulting in the heater being disabled.

Next Steps: Reach out to your authorized Jacuzzi®️ dealer or a qualified service technician for support.

4. T–OH or H–OH or Watchdog

If this error code appears on your control panel, it signals that the water temperature has risen to 112°F (44°C), and is too hot to enter. In an attempt to bring the temperature back down, your spa may turn on the circulation pump to circulate water through the heater.

This code may be accompanied by a flashing red light on your spa, serving as a secondary warning to stay out of the hot tub.

This error code is the most common:

  • After a fresh fill (a long heater cycle)
  • After a power outage or after using the tub for a long time (a long heater cycle)
  • A long filter cycle (especially in the summer)

Next Steps: DO NOT enter the spa. When this error code appears, we recommend checking to see if the water is actually hot.

Sometimes, this error will appear when the temperature sensor malfunctions and your tub is actually cooling down because the heater will not turn on due to the temperature sensor thinking the water is hot.

If the water is cold, cool or lukewarm, then you likely need to replace the temperature sensor

If the water is hot, you can use a digital thermometer to check the water temperature. If it is lower than 108℉ and you have this warning, you likely need a new temperature sensor

If the water is higher than 108℉ follow these steps:

  • Remove the cover to cool the water until the tub cools to 104℉ (or your set point)
  • Monitor to see if the event occurs again
  • Ensure the tub doesn’t cool too much. This can result in a long heater cycle, causing the temperature to rise too high again.

Another thing to keep in mind is that this can be a common occurrence in the summer due to lower filtration cycles, as these can cause the temperature to rise inadvertently

Reach out to your dealer or a certified technician for support if needed.

5. FLO Codes

There are three different FLO codes to watch for: FL–1, FL–2 or FL–3.


This can indicate a few different things, such as a flow switch being stuck open, a severely dirty filter cartridge, or your spa has an airlock at the circulation pump intake.

This will result in the spa heater turning off, and jets pump #1 being deactivated.

Next Steps: Try the troubleshooting steps found HERE. These tips, more often than not, solve the issue and avoid a service appointment and charge.


This code signifies a flow switch malfunction with it being stuck closed. This will lead to the deactivation of the spa heater, and possibly jets pump #1 as well.

Next Steps: You should call a service professional. Most of the time, a new flow sensor will work, but there are other causes, too.


This error code points to an issue with your flow switch, signalling it’s behaving erratically, also known as a “fluttering flow switch.”

Like those above, this issue will also result in the spa heater being turned off, and the possibility of jets pump #1 being deactivated.

We recommend cleaning or replacing your filters, and checking the equipment bay for any kinked or twisted hoses. You’ll also want to check that there is enough water in the tub.

Next Steps: If you’ve tried the suggestions listed above to no avail, contact your authorized Jacuzzi®️ dealer or a qualified service technician for assistance.

6. Power Error

This code signals a GFCI trip. This happens when the hot tub has detected an unsafe condition and trips the breaker on startup.

This error needs to be reset by a service professional who will inspect the tub to be sure that the unsafe condition is resolved, or that the condition was in error (moisture in one of the temperature sensors can cause this trip to occur – but there is a real risk of serious damage to the tub so it is best to have the tub inspected).

More information can be found HERE.

Next Steps: Call a service professional

tech troubleshooting hot tub error codes

Troubleshoot Hot Tub Error Codes Alongside The GTAS Go-To Spa Experts

As we conclude this comprehensive guide on decoding Jacuzzi®️ hot tub error codes, it’s evident that understanding and addressing these error codes promptly is crucial for maintaining your hot tub’s optimal performance.

At Fix My Hot Tub, we are dedicated to helping hot tub owners maintain the integrity and enjoyment of their spa experience.

With our trained, experienced, and certified technicians, exceptional customer service, and support available 12 hours a day, including weekends, we are here to assist you with any and all hot tub service needs.

To learn more about our services or to schedule an appointment, simply reach out to your local Fix My Hot Tub service center in the Central & Southern Ontario area.

Don’t let hot tub error codes become a source of frustration – consult the experts and enjoy the relaxing benefits of your Jacuzzi®️ hot tub hassle-free.