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2-Pump 880NT Circuit Board 6600-390 - Bubbles Supply

2-Pump 880NT Circuit Board 6600-390

Part #: 6600-390

$912.21
In stock — ships today
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1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this spa pump

The 2-Pump 880NT Circuit Board 6600-390 is an OEM replacement heater control board designed for Sundance Spas systems. This genuine circuit board manages dual-pump operation and integrates with Perma Clear water treatment systems, ensuring your spa's heating and filtration work together seamlessly. The 880NT model provides reliable electronic control for your spa's essential functions.

At Bubbles Supply, we guarantee this circuit board delivers an exact fit for your Sundance spa system. Every order ships same-day and comes backed by our comprehensive 1-year warranty for complete peace of mind. This OEM part restores factory performance and reliability to keep your spa running smoothly. Always verify your existing board's part number matches 6600-390 before installation to ensure proper compatibility with your spa's electrical system.

Exact part number

6600-390

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • 6600-390 PCB
  • 880NT control board
  • 880NT heater board
  • Sundance 2-pump board

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

Common symptoms this part fixes

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

  • Spa not heating
  • High heat (HH) error code on topside display
  • Overheat (OH) error code on topside display
  • One or both pumps not responding to controls
  • Spa heats intermittently or cycles off unexpectedly
  • Perma Clear water treatment system not cycling properly

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

Before you buy — quick checklist

  • Confirm the part number printed on your existing board is 6600-390 — do not substitute by appearance alone
  • Verify your spa is an 880NT model, not a similar 880-series variant with a different board revision
  • Check that your spa uses a 2-pump configuration — single-pump 880NT systems use a different board
  • Inspect the board for obvious damage (burnt components, melted connectors) to rule out upstream electrical faults before replacing
  • Document or photograph all wiring harness connections before disconnecting anything

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

Install difficulty: Hard — Technician recommendedTypically 60-120 minutes

Warranty

1 year 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.

Customer reviews

AI Fitment Assistant

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

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