Pentair SuperFlo VS Fault 1A — Power Module Over Current
Fault 1A (also displayed as "IR") on the SuperFlo VS indicates the power module detected excessive current draw. If this fault appears only once, a power cycle may clear it. If it appears repeatedly, there is likely a mechanical problem with the pump's rotating assembly.
What Causes Fault 1A?
Mechanical Obstruction (Most Common — Recurring Fault)
- Debris in impeller: Leaves, hair, or scale buildup restricting rotation
- Seized impeller: Impeller won't rotate freely
- Damaged mechanical seal: Seal failure creating drag on shaft
- Worn bearings: Excessive friction in motor bearings
Electrical Issues
- Low supply voltage causing higher current draw
- Loose or corroded power connections
- Undersized wire gauge for the run length
One-Time Events
- Startup surge on a cold motor
- Power fluctuation from utility
Troubleshooting Steps
Step 1: Power Cycle
- Turn off breaker
- Wait for all keypad LEDs to turn off
- Turn breaker back on and restart
- If fault does not return, monitor for recurrence
Step 2: Check Impeller by Hand
- Turn off breaker — wait for LEDs to go out
- Look through the see-through lid at the impeller
- Try to rotate the impeller by hand (you may be able to feel resistance through the lid)
- The impeller should rotate with moderate resistance — not freely, but not stuck
- If stuck or grinding: disassemble and inspect
Step 3: Disassemble and Clean Impeller
Tools required: 1/4" socket, 3/8" socket, 9/16" open-end wrench, 1/4" Allen key, flat-blade screwdriver
- Turn off power at breaker and verify LEDs are out
- Remove drain plugs and drain pump
- Remove the 4 bolts holding the volute to the rear sub-assembly
- Gently pull the two pump halves apart
- Remove the 3 hex screws holding the diffuser
- Remove the impeller locking screw (left-hand thread — loosens clockwise)
- Insert a 1/4" Allen key through the motor fan cover hole to hold the shaft, then unscrew impeller counter-clockwise
- Clean debris from impeller and volute
- Inspect impeller for cracks or damage — replace if damaged
- Reassemble in reverse order
Step 4: Inspect Mechanical Seal
While disassembled, inspect the mechanical seal:
- Check for water leaking from between motor and volute (indicates seal failure)
- Inspect seal faces for scoring or damage
- Replace if damaged — a failed seal can also cause over current by creating shaft drag
Step 5: Check Supply Voltage
- Measure voltage at motor terminals while running
- Should be within 10% of nominal (115V or 230V depending on installation)
- Low voltage increases current draw — consult electrician if voltage is consistently low
Replacement Parts
| Part | Part Number |
|---|---|
| Impeller (mfg. before 6/10/19) | 355074 |
| Impeller (mfg. after 6/10/19) | C105-238PDCA |
| Mechanical Seal (mfg. before 6/10/19) | 354545S |
| Mechanical Seal (mfg. after 6/10/19) | 17351-0101S |
| Diffuser (mfg. before 6/10/19) | 355618 |
| Diffuser (mfg. after 6/10/19) | 355949 |
| Motor/Drive Assembly | 353132S |