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YT Lower Control 6600-519 - Bubbles Supply

YT Lower Control 6600-519

Part #: 6600-519

$2849.58
In stock — ships today
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1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this control pack

The YT Lower Control 6600-519 is a genuine OEM heater control assembly designed for 2015 and newer Dimension One Spas. This lower control unit comes without the heater element, making it perfect for upgrades or replacements where you're keeping your existing heating element. The part effectively resolves common HH and OH error codes that indicate control system issues.

At Bubbles Supply, we guarantee this control assembly will be an exact fit for your Dimension One spa system. Every YT Lower Control ships the same day you order and includes our comprehensive 1-year warranty for complete peace of mind. Before installation, ensure your spa model year is 2015 or later and verify compatibility with your existing heater configuration for optimal performance.

Exact part number

6600-519

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • D1 Lower Control Board
  • Heater Lower Control Assembly
  • YT Lower Control

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:

  • HH error code displayed on topside panel
  • OH error code displayed on topside panel
  • Spa heater not reaching set temperature
  • Heater control system unresponsive
  • Spa shutting down due to overheat fault
  • Inconsistent heating or erratic temperature readings

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

Before you buy — quick checklist

  • Confirm your spa is a 2015 or newer Dimension One model — this part is not compatible with earlier generations
  • This assembly does NOT include the heater element — verify you are reusing or separately sourcing a compatible element
  • Note whether your HH or OH fault clears after a reset; if it returns immediately, the lower control is the likely culprit
  • Check that your existing heater element is in good condition before installing — a failed element can damage a new control
  • Have your spa's model number and serial number on hand to confirm fitment before installation

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

Install difficulty: Medium — Some experience neededTypically 45-90 minutes

What's in the box

  • YT Lower Control assembly (6600-519)
  • Manufacturer documentation

If your order is missing any items listed above, contact hello@bubblessupply.com within 48 hours of delivery.

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.

Customer reviews

AI Fitment Assistant

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

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