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J-300 1-Pump Circuit Board 6600-786 - Bubbles Supply

J-300 1-Pump Circuit Board 6600-786

Part #: 6600-786

$1628.55
In stock — ships today
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🔒 Secure checkout↩️ 30-day returns✅ 1-year warranty
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Fits these systems

Jacuzzi

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1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

Before you buy — quick checklist

  • Confirm your spa is a J-300 series model — check the equipment bay label or owner's manual
  • Verify your system is a single-pump configuration, not a 2-pump setup (a different board is required for 2-pump systems)
  • Match the part number 6600-786 exactly to the label on your existing board before ordering
  • Inspect wiring harness connectors for damage or corrosion — a bad board swap won't fix connector-level faults
  • Rule out a tripped GFCI or blown fuse as the root cause before replacing the board

Reading the checklist now prevents 90% of returns. Worth the 60 seconds.

Exact part number

6600-786

Save this for ordering or warranty claims

Common symptoms this part fixes

If your spa is showing any of these signs, this part is likely your fix:

  • Spa completely unresponsive — no display, no function
  • Pump fails to start despite correct settings
  • Heater not activating or maintaining temperature
  • Error codes appearing on topside control panel
  • Spa cycling on and off erratically
  • Topside panel unresponsive or displaying blank screen

Not sure if this is your problem? Try our diagnostic centre or .

About this spa pump

The J-300 1-Pump Circuit Board 6600-786 is the genuine OEM control board designed for Jacuzzi J-300 series spas equipped with single-pump systems. This authentic Jacuzzi replacement part manages your spa's essential functions including pump operation, heating cycles, and system diagnostics to keep your hot tub running smoothly.

Built to exact factory specifications, this circuit board delivers the reliable performance your Jacuzzi spa demands. At Bubbles Supply, we guarantee an exact fit for your J-300 series spa and back every purchase with our comprehensive 1-year warranty. Orders ship the same day for minimal downtime. Installation requires basic electrical knowledge and should be performed with power disconnected - always verify your current board's part number matches 6600-786 before ordering to ensure proper compatibility.

Also known as / Replaces

This part replaces or is interchangeable with:

  • 6600-786 circuit board
  • J-300 control board
  • J-300 main board
  • J-300 PCB

Looking for an older part number? Check our supersession lookup tool

Install difficulty: Hard — Technician recommendedTypically 60-90 minutes

Warranty

1 year manufacturer warranty against defects

Covers manufacturing defects. Does not cover improper installation, normal wear, or accidental damage.

Warranty claims: warranty@bubblessupply.com

Perfect Fit Guarantee

Ordered with our help and the part doesn't fit? Contact us before installation. We'll resolve it with an exchange, replacement recommendation, or return approval.

Learn about our Perfect Fit Guarantee →

Shipping

We ship across the US and Canada. US orders ship from our US warehouse to US customers; Canadian orders ship from our Canadian warehouse to Canadian customers — no cross-border shipping, no surprise duties. In-stock orders placed before 3pm CT ship same day. Standard shipping $9.95 flat rate. Free shipping on orders over $200. Express options available at checkout.

Returns

30-day hassle-free returns on unused parts in original packaging. Contact us before returning to receive your RMA number.

Frequently asked questions

Check the Compatibility section above to confirm fitment for your spa brand and model. If your model is not listed, use our fitment selector at /pages/find-my-part or ask our parts AI for a personalized recommendation.

In-stock orders placed before 3pm CT ship the same day. You will receive tracking information by email as soon as your order ships.

We accept returns within 30 days of delivery for unused items in original packaging. Email returns@bubblessupply.com with your order number to start a return. Installed electrical parts cannot be returned for safety reasons.

Yes, all new parts come with a 1-year warranty against manufacturing defects. Warranty does not cover damage from improper installation or normal wear and tear.

AI Fitment Assistant

Tell us your spa model and we will confirm this part fits before you buy.

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