Pentair Intelliflo Pump Drive (VS Model)| 356878Z
Pentair
SKU: 356878Z
Pentair 356878Z Variable Speed Motor Drive Assembly (Drive Kit, No Keypad)
The Pentair 356878Z is an OEM replacement variable-speed drive (VFD/drive module) used on select Pentair IntelliFlo-family pumps. This drive assembly controls motor speed, communication, and pump operating modes. It is commonly sold as a drive kit/drive assembly without the keypad (keypad/cover are typically purchased separately if needed).
Common Applications
- Pentair IntelliFlo / IntelliPro variable-speed pump models that use the “VS / 2VST / i1 / i2” style drive
- Pentair IntelliFloXF variable-speed pump power end assemblies using the VS/2VST-style drive
- Used as the replacement when the drive fails but the motor and wet end are still serviceable
What It Fixes
- Error codes related to drive electronics (varies by model)
- Pump will not start, will not hold speed, or speed is erratic
- Loss of control/communication (when wiring, power, and keypad are confirmed good)
- Overheating/drive fan issues (when tied to the drive module rather than airflow obstructions)
What’s Included / Not Included
- Included: Drive assembly (electronics module)
- Not included (commonly): Keypad and keypad cover (often sold as a separate kit)
- Not included: Motor, seal plate, wet end components
Compatibility Notes (Important)
- This part number is associated with “VS / 2VST” style drives on IntelliFlo-family pumps.
- Some pump families use different drive part numbers (for example, VSF models often use a different drive).
- Match by pump model/HP/kW rating and your pump’s parts diagram (or the drive label) before ordering.
Installation Notes
- Turn off power at the breaker and verify power is off before opening the drive.
- Take photos of wiring connections and communication leads before removal.
- Inspect the motor cable/connector and bonding/grounding for heat damage or corrosion.
- After installation, confirm the pump is properly bonded/grounded and the drive cover seals are intact to protect electronics.
- If a keypad is reused, confirm it is compatible with the pump/drive revision and that the keypad gasket is seated.
Related Products (Aqua Pool Supply)
- Pentair Keypad Assembly Kit (Search)
- Pentair Keypad Cover (Search)
- Pentair Drive Hardware / Fasteners (Search)
- IntelliFlo Seal Plate O-Ring / Wet End Seals (Search)
Maintenance Tips
- Keep the equipment pad ventilated—drive electronics run hotter when airflow is restricted or exposed to direct sun in tight enclosures.
- Maintain stable line voltage and correct bonding/grounding; electrical issues can shorten drive life.
- Use a proper surge protector rated for pool equipment where applicable, especially in lightning-prone areas.
- If the pump is leaking, fix wet-end leaks promptly—moisture and corrosion are common contributors to drive and keypad failures.
Questions about returns? View our return policy.
Hours Of Operation:
Monday - Friday: 7:00 am to 5:00 pm Phoenix Time
Saturday: 8:00 am to 2:00 pm
Sunday: Closed
- We do not ship on Saturday or Sunday.
- Orders totaling more than $300 will require signature confirmation upon delivery.
- We process and prepare orders for shipment within 1 business day. Please note that many other pool supply retailers require 3–5 days of handling time before shipping.
- Orders placed after 1:00 pm Phoenix Time may not be eligible for same-day shipment.
- Expedited shipping options are available at checkout.
Return Policy:
- Products that are received damaged will receive a refund in store credit.
- Most products are eligible for return within 30 days of receipt, except where noted below.
- To initiate a return, please complete an RMA form prior to sending your item back.
- Original shipping costs are non-refundable and will be deducted from the return credit.
- Items returned missing accessories or original packaging, or that are not in the same condition as received, may be subject to a restocking fee of up to 100% depending on the condition of the item upon return.
- Some returns will be charged an automatic 15% restocking fee.
- We are unable to issue refunds for items that have been damaged or rendered inoperable due to installer error.
- Please complete the return form to receive your RMA number and return shipping label.
- Chemical products are not eligible for return under any circumstances.
- The Pentair Colorsync 618031 is not eligible for return.
- Pool cleaners are not eligible for return.
- Opened seals and o-rings are not eligible for return.
- Capacitors are not eligible for return.
- Plastic popup tools are not eligible for return.
- Automation components and circuit boards are not eligible for return.
- If a light is returned due to a reported malfunction and is found to be fully operational upon testing, return shipping costs and a restocking fee will be deducted from the refund.
- Orders refused at the time of delivery will be subject to the original shipping costs being deducted from the refund.
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