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

1. Turn off breaker
2. Wait for all keypad LEDs to turn off
3. Turn breaker back on and restart
4. If fault does not return, monitor for recurrence

Step 2: Check Impeller by Hand

1. Turn off breaker — wait for LEDs to go out
2. Look through the see-through lid at the impeller
3. Try to rotate the impeller by hand (you may be able to feel resistance through the lid)
4. The impeller should rotate with moderate resistance — not freely, but not stuck
5. 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

1. Turn off power at breaker and verify LEDs are out
2. Remove drain plugs and drain pump
3. Remove the 4 bolts holding the volute to the rear sub-assembly
4. Gently pull the two pump halves apart
5. Remove the 3 hex screws holding the diffuser
6. Remove the impeller locking screw (left-hand thread — loosens clockwise)
7. Insert a 1/4" Allen key through the motor fan cover hole to hold the shaft, then unscrew impeller counter-clockwise
8. Clean debris from impeller and volute
9. Inspect impeller for cracks or damage — replace if damaged
10. 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

1. Measure voltage at motor terminals while running
2. Should be within 10% of nominal (115V or 230V depending on installation)
3. 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

Related Guides

• SuperFlo VS Troubleshooting Guide
• Pump Won't Start