Sold todayVariable-speed
Pentair WhisperFlo VST
The variable-speed WhisperFlo: a drop-in for an existing WhisperFlo, sized for pools that needed up to a 2 HP pump.
2.6 THP · 115/208-230V · variable-speed
What we repair on the Pentair WhisperFlo VST
A permanent-magnet motor run by an electronic drive — no start capacitor to replace. When one fails we read the drive's own fault before touching a part.
- Drive or keypad showing a fault, or the display dark — diagnosed against the manufacturer's fault list
- Not answering the automation or app — communication wiring and settings
- Speeds and schedules set wrong — reprogrammed for this pool, so it runs slow and quiet most of the day
- Leaking at the shaft seal (water under the motor) — a new mechanical seal before the bearings rust
- Air in the basket and losing prime — lid o-ring, basket, drain plugs, suction-side unions
- Loud grinding or screeching — worn motor bearings
- Low flow — impeller clogged or worn, diffuser gasket, basket
- Cracked strainer housing, lid or basket
From Pentair's manual
- Shaft seal 071734S (ozone/salt-resistant 071732S); seal plate kit 350202.
- Drive faults show as a two-character code on the display, e.g. 19 = motor start failure (can mean a locked rotor), 0F = supply under 99 V.
The facts, from Pentair
- Type
- Variable-speed
- For
- In-ground pools
- Ratings
- 2.6 THP
- Voltage
- 115/208-230V
- Maximum flow
- — not stated by the manufacturer
- Controls
- On-board keypad: 3 speeds plus override, 24-hour clock
- RS-485 and digital inputs through wiring kit 356324Z
- Drop-in replacement for an existing Pentair WhisperFlo
- Permanent-magnet TEFC motor, 450–3450 RPM
- 2 × 2-inch ports
- ENERGY STAR certified
| Model number | What it is |
|---|---|
| 011533 | WhisperFlo VST, 2.6 THP |
Where these facts come from
Checked against Pentair's own pages on 2026-09-23. Manufacturers change their lineups — if something here no longer matches, the manufacturer's page is right and we will fix ours.