Brands & error codes
Hydro-Quip hot tub error codes
Hydro-Quip controls (the CS/ES 6200, 6230 and 9700 series and their relatives) don't spell out much on the display. Most problems show up as three flashing dots under the temperature. Here's what Hydro-Quip's own documents say they mean.
Three flashing dots: what Hydro-Quip says
Three flashing dots below the time or temperature mean the control has detected a system error, and the heater won't run while it's showing. Hydro-Quip's 9700 troubleshooting guide lists three possible causes:
| What you see | What it means |
|---|---|
| 3 flashing dots with the pump running | The pump has started but the pressure (flow) switch hasn't closed. The usual reasons are low water, a dirty filter, a closed valve, an airlock after a refill or debris in the plumbing. If all of those check out, the switch itself may need adjusting. |
| 3 flashing dots with the pump off | The pressure or flow switch reads as closed even though no pump is running. That's a switch or adjustment problem for a technician. |
| 3 flashing dots plus the High-Limit Tripped light | An overheat was detected. Hydro-Quip says it isn't safe to get in the spa until this is corrected. |
The CS6200 / CS6230 error table in a spa maker's manual describes the same pattern. It adds that if the dots show with the temperature reading 115°F or higher, an over-temperature has happened and service is needed.
Overheat and temperature sensor errors
| Condition | What Hydro-Quip's guide says |
|---|---|
| Water over 112°F at the temperature sensor | The heater shuts off and the pumps, blower and other outputs are disabled until the water drops below 110°F. |
| Over 119°F at the high-limit sensor (on the heater) | The heater shuts off; the pumps and blower keep running. Power has to be switched off and back on to reset this error. |
| Display stuck at 32°F or 122°F | The temperature sensor has failed (the CS6200 / CS6230 table says a constant 32°F or 125°F). That's a sensor job for a tech. |
Don't keep resetting an overheat. Stay out of the water, take the cover off to let it cool, and if it trips again, get it looked at. Hydro-Quip's guide points to a blocked filter, a closed valve, a sensor out of place, the circuit board or long filter cycles in hot weather, and sorting out which one is technician work.
Spa running every couple of hours in cold weather?
That's normally Smart Winter Mode, not a fault. Hydro-Quip's guide says that when the onboard sensor reads below 59°F, the system runs any pump that hasn't run in the last 2 hours for about a minute to keep the plumbing from freezing, and it does this for 24 hours. The filter-cycle icon flashes while it's happening. In Hydro-Quip's words, the spa may seem to have "a mind of its own" in cold weather, and that's a safety feature.
More on cold-weather care in how to winterize a hot tub.
What you can safely check
- Water level: make sure it's filled to the level your spa maker recommends.
- Filter: with the power off, take the filter out, then run the spa without it for a short test. Hydro-Quip says that if the dots go away, the filter needs a proper cleaning, even if it doesn't look dirty, because oils and lotions clog it. Put it back once you're done.
- Valves: check that the shutoff valves are fully open.
- Just refilled? Air may be trapped in the pump. See clearing an airlock after a refill.
Stop there. Adjusting the pressure switch, jumpering it, testing sensors, changing fuses or working on the circuit board means opening the control box, and that's a job for a qualified spa tech. On a quick video call, a tech can look at the lights on the control box faceplate with you (Hydro-Quip calls them VDS indicators) and tell you whether it's the filter, the pressure switch, a sensor or the board before you buy anything.
Common questions
What do three flashing dots mean on a Hydro-Quip hot tub?
Three flashing dots mean the control has detected an error and the heater won't run. With the pump on, it usually means the pressure switch hasn't closed because of low water, a dirty filter, a closed valve or an airlock. With the pump off, the switch reads closed when it shouldn't. If the High-Limit Tripped light is also on, it's an overheat, so stay out of the water.
How do I reset a Hydro-Quip hot tub after an overheat?
Hydro-Quip's guide says power has to be turned off and back on to reset a high-limit error. Let the water cool first, with the cover off. If it trips again, don't keep resetting it. Have the flow, the sensors and the control checked.
Why does my Hydro-Quip spa turn on by itself in winter?
That's Smart Winter Mode. When the onboard sensor reads below 59°F, the system runs any pump that hasn't run in 2 hours for about a minute to keep the plumbing from freezing. It's a safety feature, not a fault.
My Hydro-Quip spa shows 32°F all the time. What's wrong?
A steady 32°F (or 122°F to 125°F) reading that doesn't match the real water temperature points to a failed temperature sensor, according to Hydro-Quip's documents. That's a sensor replacement for a technician.
Related guides
Hot tub not heating
Jets run but the water stays cold. Usually it's flow, not the heater.
Read the guideHot tub overheating
Water too hot or an OH-type code. Stay out of the water and check it.
Read the guideAirlock after a refill
Just drained and refilled, and now no jets or no heat? Prime the pumps.
Read the guideBalboa error codes
HFL, LF, dr, OHH, OHS, sensor and GFCI messages, from Balboa's own guides.
Read the guideSources
- Hydro-Quip, The 9700 Series spa controls system troubleshooting guide: 3 flashing dots, pressure switch, over-temperature, temperature sensor and freeze protection (Hydro-Quip document; copy hosted by SpaCare)
- Premium Leisure Products spa owner's manual (part 7619): error identification for Hydro-Quip CS6200 / CS6230 controls
Brand names belong to their owners. Hot Tub Helpline isn't affiliated with or endorsed by any manufacturer. Steps and codes vary by model and year, so always check your own owner's manual.