Hot tubs are luxurious; however, when mysterious codes start appearing on your spa control panel, relaxation becomes perplexing. Error codes such as PR, LF, EC, or OHH are rather scary-looking things—but they also tend to be the way your hot tub tells you, “I need a bit of attention.”
This is going to be a guide to hot tub error codes, and in it, we will cover the most common hot tub error codes, what they mean, how to troubleshoot them, and when to hire a professional. Including Master Spas, Sundance Spas & More Popular Brands.
What are Hot Tub Trouble Codes?
The error codes, fault codes, and trouble codes on hot tubs are self-diagnostic codes incorporated in the system. They are there to warn you about a possible issue, e.g., the filters are clogged, there is not sufficient water flow, there is an electrical fault, or, in most hot tubs, there is an overheat warning.
Where do they appear? Most frequently on the topside control panel face or the digital display. Other manufacturers can apply acronyms (EC for economy mode or PR for priming).
The Reason They Are Important: Not adhering to these codes can lead to much greater issues, such as heater breakage, pump burnout, or even electrically dangerous situations.
For a complete overview of common hot tub electrical hazards, see our Safety and Repair Guide to Hot Tub Electrical Problems
Brand-Specific Error Codes: Master Spas Sundance Spas
Master Spa Codes
- PR (Priming Mode): This occurs during startup, allowing air to work out of the plumbing. No bother—just wait or use prime.
- OH (Overheat): The water is too hot now. Switch off and remove the cover. Allow it to cool off.
- HL (High Limit): The high-limit sensor is closed. This tends to occur since it lacks sufficient water or there is an obstruction to the flow.
Sundance Spas Codes
- FL (Flow Error): Experiencing difficulties with water flow? You may want to investigate the filters and possibly investigate the circulation pump as well
- OHH (Overheat): It is too hot, so stop the power and allow the tub to cool off.
- EC (Economy Mode): The hot tub heats when it is filtering the water. Neither a fault code nor anything like that. It is nothing but a saving.
Similar Reading: Most error codes display on the panel. If it’s unresponsive, see our control panel troubleshooting guide.
The Best Codes of Hot Tubs
The most typical codes of hot tubs and their interpretations are listed below with their corresponding troubleshooting:
| Code | Meaning | Brand Examples | Fix Suggestions |
| PR | Priming Mode | Most brands | Run jets, release air from plumbing |
| LF | Low Flow | Jacuzzi, Master Spa | Clean the filter and ensure good water level |
| EC | Economy Mode | Most brands | Switch to Standard Mode if faster heating is needed |
| OHH | Overheat | Sundance, Cal Spas | Power off, remove cover, cool naturally |
| FLO | Flow Error | Jacuzzi, Bullfrog | Check circulation pump and filters |
| DR | Dry Heater | Caldera, Sundance | Check water level; top up if low |
Codes of Freeze Protection: PRR vs PRH
In wintertime, the hot tub might have the codes such as PRR or PRH that indicate Freeze Protection Modes.
- PRR (Pump Running to Prevent Freeze): Your tub runs pumps every so often to keep the water warm.
- PRH (Heater Active to Freeze Prevent): A heat element aids in ensuring that the water does not freeze.
These are safety characteristics, not defects. Unless these codes appear during warm weather, it may imply that the sensor is faulty or the control board is faulty.
Learning NEC Hot Tub Codes
A standard, the NEC-National Electrical Code, purports to provide electrical safety. Possibly, the tripping of the breakers or grounding errors may only be linked with NEC compliance when using your hot tub.
Make sure that the GFCI breaker is installed properly.
Keep an eye on cord-end GFCIs or loose electrical connections.
Provided that you have error messages as a result of a power cut or sudden shutoff, you may be required to:
- Rest the GFCI breaker
- Check fuses and wiring
- Continuity test and corrosion damage test
Similar Reading: Some error codes indicate total power loss. Diagnose with our electrical guide.
DIY Troubleshooting and Making a Professional Call
DIY Fixes:
- Clean/replace filters
- Circulation pump bleed air
- Water levels: Check water levels
- Toggle heating modes (EC, Standard, Sleep)
- Reset the breaker or topside panel
How to Call a Technician:
- Short in the heater element
- Blown inside fuse
- Failure of control board
- Worn or rusted wiring
- Continuity testing does not work
Even when there is no other alternative except to call in a qualified hot tub technician, it is dangerous to attempt to fix the electrical problems without the expertise.
Preventive Maintenance: Don’t Get Trouble Codes in the Future
To maintain your hot tub in a smooth-flowing and error-free condition:
- Clean filters to avoid low-flow or FLO errors.
- Check water chemistry—water can be too imbalanced and hurt sensors
- Check the control board to see whether it is damaged by moisture
- Electrical parts that are not wet are used regularly
- Cover spa when it is cold to prevent freeze codes
FAQs
What Should I do when my Hot Tub Shows an Error code like PR or LF?
Most often these are related to minute problems such as air in the plumbing (PR) or low water flow (LF). Check filters and water levels, and run jets to clear before calling a technician.
Are Codes like EC or PRR Signs of a Problem with my Hot Tub?
No, EC and PRR are normal operational modes. It represents energy-saving or winter protection functions, not faults.
When is it Necessary to call a Professional for a Hot Tub Error Code?
In case you have checked the filters, levels of water, and reset the panel but without success, and in case electrical problems such as shorts or blown fuses are suspected, then call a qualified technician.
How Can I Prevent Error Codes from Appearing in the First Place?
Clean filters regularly, keep water chemistry balanced, and check for moisture or wear on the control board to avoid problems and keep your spa running error-free.
What does it Mean if my Hot Tub Overheats or shows OHH or OH?
“OHH” or “OH” means that the temperature of the water is very high. Turn off the power, take off the cover, and let it cool down, and then restart to prevent any harm.
Conclusion
Error codes on a hot tub like PR, LF, EC, and OHH are not to panic about, but rather your spa is attempting to be of assistance. Become familiar with the meaning of these hot tub trouble codes and what to do in response, and you will be able to eke years more life out of your spa and enjoy thoroughly stress-free relaxation—year-round.
In case the issue continues occurring or appears to be electrical, you need to discuss it with a certified hot tub specialist.
