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MS8000 Control Pack X300020 - Bubbles Supply

MS8000 Control Pack X300020

Part #: X300020

$3142.23
In stock — ships today
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Also replaces

X300020
1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this control pack

The MS8000 Control Pack X300020 is a genuine OEM heater control system designed for Master Spa hot tubs. This essential component manages your spa's heating functions and replaces failed control packs that may be displaying HH (high limit) or OH (overheat) error codes on your topside display.

Built to Master Spa's exact specifications, this control pack delivers reliable temperature management and system protection for years of worry-free operation. At Bubbles Supply, we guarantee this is the exact fit for your spa with our precise part matching, plus you'll get same-day shipping and full 1-year warranty coverage. Professional installation is recommended to ensure proper electrical connections and system calibration—always verify your existing control pack's part number before ordering to confirm compatibility.

Exact part number

X300020

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • heater controller
  • hot tub control pack
  • MS8000 control pack
  • spa heater control pack
  • X300020

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 on topside display
  • OH (overheat) error code on topside display
  • Spa heats to incorrect temperature or not at all
  • Heater fails to cycle on or shut off properly
  • Control pack not responding to thermostat input
  • Spa repeatedly trips high-limit sensor

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 control pack matches X300020 before ordering
  • Verify your spa model is in the Master Spa MS8000 series
  • Check whether the HH or OH error clears after resetting — if it returns immediately, the control pack is a likely culprit
  • Inspect the high-limit sensor and flow switch before replacing the control pack — a failed sensor can mimic a bad control pack
  • Take photos of all existing wiring connections before disconnecting anything

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

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.

Customer reviews

AI Fitment Assistant

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

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