Pool pumps
Pentair IntelliFlo alarms and warnings, explained
The IntelliFlo VS+SVRS and the newer IntelliFlo3 VSF report alarms and warnings by name, and Pentair's manuals say what each one means. Priming Failure and the limit warnings usually come down to water, air or settings you can check yourself. Over Current, voltage alarms, Internal Error and repeated Overheat or SVRS alarms are for a technician.
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An IntelliFlo doesn't show numbered codes. It names the problem: Priming Failure, Overheat, Over Current. That's helpful, but the name alone doesn't tell you whether it's something you can sort out in five minutes or a drive that needs a technician. Pentair's manuals do, and this guide goes through every alarm and warning in two of them.
Which IntelliFlo do you have?
This guide covers two families, and they report problems differently:
- IntelliFlo VS+SVRS (and the IntelliPro VS+SVRS) has a control panel on the pump with alarm lights. All the buttons stop working until you acknowledge the alarm with Reset, and Reset only clears it once the fault itself has gone (Pentair IntelliFlo VS+SVRS guide, p. 27).
- IntelliFlo3 VSF (and the IntelliPro3 VSF) shows its codes in the Pentair Home app, on an automation system or on an optional touchscreen. The ON/STOP light blinks red for an alarm, and the pump stops until it's resolved. It blinks green or yellow for a warning (Pentair IntelliFlo3 VSF guide, p. 11).
Older IntelliFlo models and the XF and VF pumps have their own manuals, and their messages can differ. If yours isn't one of these two, check the manual for your model before acting on anything here.
Safety first
Pentair says to disconnect power at the circuit breaker, and disconnect the communication cable, before servicing the pump, and not to adjust or service it without consulting your dealer or a qualified pool technician (Pentair IntelliFlo VS+SVRS guide, p. 27). Everything we suggest checking below can be done by looking, without opening the pump or the drive. If the pump has been running without water, let it cool before you open the strainer lid.
The codes at a glance
| Alarm or warning | Model | What Pentair says it means | Who |
|---|---|---|---|
| Priming Failure | Both | The pump didn't prime in time. Often no water in the strainer basket | Check first |
| Overheat | Both | The drive or motor is too hot, so the pump slows down | Check first; technician if it repeats |
| Drive is Derating (warning) | IntelliFlo3 | Slowing down to stop the drive overheating | Check first |
| Derating Alarm – Exceeded & Cut Off | IntelliFlo3 | Couldn't slow down enough, so it stopped | Technician if it repeats |
| Over Current | Both | The motor is working too hard, or has an electrical problem | Technician |
| Power Out/OFF | VS+SVRS | Supply voltage too low | Technician or electrician |
| Over Voltage | Both | Supply voltage too high (VS+SVRS: or water spinning the pump) | Technician or electrician |
| Under Voltage | IntelliFlo3 | Supply voltage too low | Technician or electrician |
| Internal Error / Internal Fault | Both | A fault inside the drive's software or hardware | Restart once, then technician |
| SVRS Alarm | VS+SVRS | The pump detected a possible suction entrapment and shut off | Check first; technician if it repeats |
| Speed Limit / Pressure Limit / Flow Limit (warnings) | IntelliFlo3 | Running at a limit set in the pump's settings | Settings |
| Thermal Mode | Both | Freeze protection running, based on the drive's temperature | Information |
| Weak Wi-Fi Connection / Offline | IntelliFlo3 | Connection to the app or cloud | Information |
Sources: Pentair IntelliFlo VS+SVRS guide, p. 27; Pentair IntelliFlo3 VSF guide, p. 11.
Priming Failure
On the VS+SVRS, if the pump isn't primed within the Max Priming Time set in its priming menu, it stops and shows a Priming Alarm for 10 minutes, then tries again. After five failed attempts it sets a permanent alarm that has to be reset by hand (Pentair IntelliFlo VS+SVRS guide, p. 27). On the IntelliFlo3, Pentair says a priming failure "can be caused by lack of water in the volute strainer basket" (Pentair IntelliFlo3 VSF guide, p. 11).
What you can check:
- The pool's water level, about halfway up the skimmer opening.
- That the skimmer and pump baskets are empty and the valves on the suction side are open.
- The strainer lid and its O-ring: clean, seated and locked down.
- Air bubbles coming into the strainer basket while it runs, which point to an air leak on the suction side.
If the pump still won't hold its prime, the leak is usually somewhere you can't see from the pad. See pool pump losing prime and pump running but no water flow.
Overheat and derating
On the VS+SVRS, Overheat means the drive is above 130°F, and the pump slowly reduces speed until it cools (Pentair IntelliFlo VS+SVRS guide, p. 27). On the IntelliFlo3, Pentair says the motor has detected an abnormally high internal temperature, caused by a blocked cooling fan inlet or outlet or by "excessively high ambient air temperature". The pump slows down to protect itself, and shows Drive is Derating while it does. If it can't slow down enough, it stops and shows Derating Alarm – Exceeded & Cut Off, then restarts on its own once it has cooled (Pentair IntelliFlo3 VSF guide, p. 11).
That makes it a summer alarm in the East Valley. Pentair's own care instructions are the fix for most of them: shade the motor from the sun, keep any enclosure well ventilated with cross ventilation, and leave at least three inches clear behind the motor fan (Pentair IntelliFlo VS+SVRS guide, p. 24). Clear leaves, dust and anything stored against the pump.
If it keeps overheating in shade with clear vents, it's no longer about the weather. Pentair's troubleshooting chart for a motor that runs too hot lists checking the voltage and checking for an impeller that is rubbing (Pentair IntelliFlo VS+SVRS guide, p. 28). That's work for a technician. See pool pump keeps shutting off.
Over Current
On the VS+SVRS this means the drive is overloaded or the motor has an electrical problem. The drive restarts 20 seconds after the condition clears (Pentair IntelliFlo VS+SVRS guide, p. 27). On the IntelliFlo3, Pentair says the load on the motor has increased "due to debris, part interference, temperature issues, age of parts, or supplied voltage", and the fix it gives is to inspect the rotating parts, which means taking the pump apart (Pentair IntelliFlo3 VSF guide, p. 11).
The one thing to check yourself is that the strainer basket isn't packed with debris. Beyond that, an Over Current alarm needs the pump opened and the supply measured. See variable-speed pump repair.
Voltage alarms: Power Out/OFF, Over Voltage, Under Voltage
These are about the electricity reaching the pump, not the pump itself:
- Power Out/OFF (VS+SVRS): the incoming voltage is too low, and the drive faults to protect itself. It saves its settings as it shuts down, and if power comes back during the roughly 20 seconds that takes, it won't restart until it has finished (Pentair IntelliFlo VS+SVRS guide, p. 27).
- Over Voltage: on the VS+SVRS, either the supply voltage is too high, or water from somewhere else is spinning the pump and generating voltage inside the drive. It restarts 20 seconds after the condition clears (Pentair IntelliFlo VS+SVRS guide, p. 27).
- Over Voltage and Under Voltage (IntelliFlo3): the supply is outside the proper range, and the alarm clears by itself when it returns to normal (Pentair IntelliFlo3 VSF guide, p. 11).
A one-off during a storm or an outage is the supply. If it keeps happening, the voltage needs measuring. Pentair's chart says to check it at the motor terminals and at the panel while the pump runs, to look for loose connections, and to bring in an electrician if line voltage is below 90% or above 110% of the rated voltage (Pentair IntelliFlo VS+SVRS guide, p. 28).
Internal Error and Internal Fault
On the VS+SVRS, Internal Error means the motor control software has hit an error: clear the alarm and restart the pump, and if it comes back, Pentair says to contact its technical service (Pentair IntelliFlo VS+SVRS guide, p. 27). On the IntelliFlo3, Internal Fault can be one of several hardware or software errors in the drive: disconnect power, reconnect after one minute, and if it remains, contact a qualified pool professional (Pentair IntelliFlo3 VSF guide, p. 11).
One restart is reasonable. An internal fault that keeps returning is the drive, and whether to replace the drive or the pump is a real decision. See repair or replace your pool pump.
SVRS Alarm
SVRS is the safety vacuum release system. The alarm means the drive detected something that looks like a suction entrapment, and shut the pump off at once (Pentair IntelliFlo VS+SVRS guide, p. 27). Treat it as the safety device it is: find out why it tripped before running the pump again, and never disable it.
Pentair's troubleshooting chart lists the usual causes (Pentair IntelliFlo VS+SVRS guide, p. 28):
- A blocked suction or discharge, including the pump and skimmer baskets.
- Flow too high or changing too quickly, or too much vacuum on the suction side.
- Air in the system, or priming not enabled.
- A suction-side pool cleaner, which changes flow in ways the pump reads as an event.
- A dirty filter, which raises system pressure and makes a real event harder to tell from normal running. See filter pressure too high.
- Repeated alarms with no blockage can come from in-floor cleaning systems, check or bypass valves opening, or speed changes. Pentair's remedies include changing the ramp speed or raising the minimum speed.
Clearing baskets and cleaning the filter are yours to do. Measuring suction vacuum, changing the ramp and minimum speeds, and sorting out valves and in-floor systems are a technician's job.
Warnings and information (IntelliFlo3)
These don't stop the pump:
- Speed Limit, Pressure Limit, Flow Limit: the pump is running at a limit set in its own settings to reach the speed or flow you've asked for. Pentair notes the pressure it monitors is total dynamic head, so it won't match your filter gauge. If Speed Limit shows with the limit already at 100%, the pump may not be able to reach the flow you've asked for (Pentair IntelliFlo3 VSF guide, p. 11).
- Thermal Mode: freeze protection, controlled by the drive's internal temperature rather than the water's. Pentair says it shouldn't be relied on as the only freeze protection for the whole system (Pentair IntelliFlo3 VSF guide, p. 11). The VS+SVRS has a Thermal Mode too, which is disabled when the pump is connected to an automation system (Pentair IntelliFlo VS+SVRS guide, p. 27).
- Weak Wi-Fi Connection and Offline: the app can't reach the pump. Pentair lists a power outage at the pump or router, or a weak signal (Pentair IntelliFlo3 VSF guide, p. 11). If the pump runs but your automation or schedule has stopped controlling it, see pool automation repair.
When to call
Call when the alarm is Over Current, a voltage alarm that keeps coming back, an Internal Error or Internal Fault that survives a restart, Overheat in the shade with clear vents, or an SVRS alarm with no blockage you can find. We read the alarm against Pentair's manual for your model, measure the supply, and check the drive, motor and wet end before anyone talks about a new pump.
If you don't know what's wrong, a diagnostic is $120, and it's credited toward your repair if you go ahead. Start from variable-speed pump repair, or answer a few questions in the Pool Problem Finder. A photo of the display or the app screen, and of the pump's label, helps.
Sources
Every Pentair statement above links to this list. Page numbers are the printed page numbers in each document.
- Pentair, IntelliFlo VS+SVRS and IntelliPro VS+SVRS Variable Speed Pump Installation and User's Guide, P/N 356916 Rev. D (11/6/23).
- Pentair, User's Guide: IntelliFlo3 VSF and IntelliPro3 VSF Variable Speed and Flow Pumps, P/N 356088 Rev. C (5/30/23).
Pentair, IntelliFlo, IntelliFlo3, IntelliPro and IntelliPro3 are trademarks of Pentair. They are named here only to identify equipment.