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Expansion Circuit Board G1900 - Bubbles Supply

Expansion Circuit Board G1900

Part #: G1900

$194.89
In stock — ships today
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🔒 Secure checkout↩️ 30-day returns✅ 1-year warranty
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1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this circuit board

The Balboa G1900 Expansion Circuit Board is a genuine OEM control pack component designed to expand the functionality of compatible Balboa spa control systems including VS510SZ, EL1000P2, and EL2001 series. This circuit board kit provides additional control capabilities for spas requiring expanded pump, heater, or accessory management beyond the base control system's capacity.

At Bubbles Supply, we guarantee this expansion board is the exact fit for your Balboa control pack, backed by our 1-year warranty and same-day shipping on in-stock items. The G1900 expander integrates seamlessly with your existing control system to deliver reliable performance and enhanced spa functionality. Professional installation is recommended to ensure proper wiring and system integration with your spa's main control board.

Exact part number

G1900

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Also known as / Replaces

This part replaces or is interchangeable with:

  • Balboa G1900 Circuit Board
  • G1900 Expander Board
  • G1900 Expansion 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 accessories not responding to control pack commands
  • Pump or heater channels missing from control system
  • Control pack unable to manage additional equipment beyond base capacity
  • Expansion-dependent features unavailable or unresponsive
  • Spa system throwing fault codes related to auxiliary or expansion board failure

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

Before you buy — quick checklist

  • Confirm your control pack model is one of the supported systems: VS510SZ, EL1000P2, or EL2001 series
  • Check whether your existing control pack already has an expansion board installed — some units ship with one pre-installed
  • Document all current wiring connections before disconnecting anything
  • Verify the G1900 is the correct expansion board revision for your control pack's firmware version
  • Have your spa's wiring diagram on hand before beginning installation

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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