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54122

M2 M3 Circuit Board 54122

Part #: 54122

$304.74
In stock — ships today
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Also replaces

54122
1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this circuit board

This Balboa M2/M3 circuit board (part #54122) is the control brain for spas equipped with Balboa M2 or M3 control systems in both Deluxe and Serial Standard configurations. The board features an 8-pin phone cable connection and manages your spa's essential functions including heating, filtration, and pump operations.

Engineered to Balboa's exacting OEM specifications, this replacement circuit board delivers reliable performance you can count on. At Bubbles Supply, we guarantee an exact fit for your system and back every board with our comprehensive 1-year warranty. Orders ship the same day to get your spa running fast. Before installation, ensure your spa is completely powered down and verify the 8-pin phone cable connection matches your existing setup for seamless compatibility.

Exact part number

54122

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • 54122
  • Balboa 54122 PCB
  • Balboa M2 board
  • Balboa M3 board
  • M2 Deluxe circuit board
  • M2/M3 control board
  • M3 Serial Standard circuit 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 displays error codes and will not recover
  • Heater not activating despite correct water temperature readings
  • Pumps not responding to topside control commands
  • Filtration cycle not running on schedule
  • Spa completely unresponsive — no display, no functions
  • Topside panel shows correct inputs but spa does not execute commands

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

Before you buy — quick checklist

  • Confirm your control pack is a Balboa M2 or M3 system — check the label on the existing board or control box
  • Verify your configuration is Deluxe or Serial Standard, as this board supports both
  • Locate and inspect the 8-pin phone cable connector on your current board — confirm it matches before ordering
  • Rule out topside panel failure before replacing the circuit board; a faulty topside can mimic board failure
  • Check for visible burn marks, corrosion, or damaged traces on the existing board to confirm PCB failure rather than a power supply issue
  • Document or photograph all wiring 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 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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