Hot Tub Error Codes: FLO, OH, DR and More
An error code tells you what the control system detected, not always what's broken. Here's what the most common codes usually mean, what you can safely check yourself, and when to call. Code names vary by brand and control system, so check your owner's manual too.
Common codes and what they usually mean
| Code | What it usually means | First thing to check |
|---|---|---|
| FLO / FL / FLC | The system isn't detecting enough water flow | Clean or remove the filter, check water level, bleed air locks |
| DR / Dry / dy | Possible low water or air in the heater | Check water level; bleed air after a refill |
| OH / OHH / HL | Water or heater temperature is too high | Remove the cover to let heat escape; check filter and flow |
| ICE / IC | Freeze protection has activated | Usually normal in cold weather; make sure the tub has power and water is circulating |
| SNA / SNB / SN / Sensor | A temperature sensor isn't reading correctly | Usually needs a technician |
| Blank screen or "---" | No communication between panel and control board | Check power and GFCI; otherwise call |
Why flow codes matter
Flow codes are the most common we see, especially at rental properties after heavy weekend use. Dirty filters restrict flow, and a heater that runs on low flow can overheat and fail. If a flow code keeps coming back after the filter is cleaned, something else is restricting water: a stuck valve, a failing pump, a pressure switch or a flow switch.
When to call
- The code returns after you clean the filter and top off the water
- You see a sensor code or a blank panel
- The GFCI or breaker trips
- It's freezing outside and the tub isn't heating or circulating
When you call, tell us the brand, the exact code shown and what the tub is doing. A photo of the panel and the equipment label helps us arrive with the right parts.
Areas we serve: Tannersville · Mount Pocono · Stroudsburg · Lake Harmony · Albrightsville · Tobyhanna
Need a hot tub technician?
Call with your spa brand, any error code on the panel and what the tub is doing. We'll confirm availability for your address and give you a straight answer on cost.
Call (570) 707-7668