Pentair IntelliFlo Priming Failure
The priming failure alarm is one of the most common issues on Pentair IntelliFlo variable speed pumps. This alarm indicates the pump couldn't establish proper water flow within the configured priming duration.
If the pump cannot prime within five attempts, it generates a permanent alarm that must be manually reset by pressing the Reset button.
What Causes Priming Failure?
Air Leaks in Suction Line
The most common cause of priming failure is air entering the suction side of the system. Air can enter through:
- Cracked or loose pump lid
- Worn lid o-ring
- Loose union connections
- Cracked suction piping
- Worn valve stem o-rings
- Loose pipe fittings
Insufficient Water
- Pool water level below skimmer
- Suction lines not full of water
- Empty pump strainer pot
- Closed suction valves
Clogged Components
- Clogged pump strainer basket
- Debris in impeller
- Blocked skimmer basket
- Dirty or clogged filter
Step-by-Step Troubleshooting
Step 1: Check Water Level
Ensure pool water level is at least halfway up the skimmer opening. If low, add water before attempting to prime.
Step 2: Inspect Pump Lid and O-Ring
- Turn off power to the pump
- Remove pump lid
- Inspect o-ring for cracks, flat spots, or debris
- Clean and lubricate o-ring with silicone lubricant
- Check lid for cracks
- Reinstall and ensure proper seal
Step 3: Fill Pump with Water
- Open pump lid
- Fill strainer pot completely with water
- Replace lid quickly
- Start pump immediately
Step 4: Check Suction Valves
Verify all suction side valves are fully open. A partially closed valve can prevent proper priming.
Step 5: Inspect for Air Leaks
While pump is running, look for:
- Air bubbles in pump basket
- Water spraying from fittings
- Wet spots on suction piping
Step 6: Adjust Priming Settings
If the pump comes out of priming mode too early or with air still visible:
- Press Menu button
- Navigate to Priming
- Adjust Priming Range (default is 5)
- Higher number = longer priming time
- Increase Max Priming Duration if needed (default is 11 minutes)
Priming Menu Settings
| Setting | Default | Range |
|---|---|---|
| Priming Enable/Disable | Enabled | Enabled/Disabled |
| Priming Speed | 3450 RPM | 2400-3450 RPM |
| Max Priming Duration | 11 minutes | 1-30 minutes |
| Priming Range | 5 | 1-10 |
| Priming Delay | 20 seconds | 1 sec - 10 min |
| Loss of Prime | Enabled | Enabled/Disabled |
When to Replace Components
- Lid O-ring: If cracked, flattened, or doesn't seal after lubrication
- Pump Lid: If cracked or warped
- Mechanical Seal: If pump is leaking between motor and volute
- Suction Piping: If cracks are found in underground or exposed pipes
Preventing Future Priming Issues
- Maintain proper water level
- Regularly inspect and lubricate o-rings
- Keep strainer basket clean
- Check for air leaks during routine service visits
- Enable "Loss of Prime" feature for automatic recovery