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Balboa 50770 Circuit Board 9120R1(x) Alt Replacement, (Std Panel)

Balboa 50770 Circuit Board 9120R1(x) Alt Replacement, (Std Panel)
Balboa 50770 Circuit Board 9120R1(x) Alt Replacement, (Std Panel)
Balboa 50770 Circuit Board 9120R1(x) Alt Replacement, (Std Panel)
Balboa 50770 Circuit Board 9120R1(x) Alt Replacement, (Std Panel)

  • Manufactured by: Balboa Water Group, Inc.
  • Part Number: 50770
  • Chip Number: 9120R1(x)

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Item Number: 22-3507-B

  • Description
  • Details
  • Reviews

The Balboa 50770 9120R1(x) circuit board is discontinued but we have options.

Option 1: Scroll down to RELATED PRODUCTS for other replacement options.

Option 2: Get your circuit board repaired.  Please contact us before sending items in for repair.

Option 3: Contact us to inquire about a new retro-fit system control box replacement.

The Balboa 50770 9120R1(x) circuit boards are also found in hot tubs made by Caldera Spas, Watkins Manufacturing Corp. and possibly others.
Cross Reference Verification
Serial Numbers:
  • 50770
  • BAL50770

Chip Numbers:
  • 9120R1A
  • 9120R1B
  • 9120R1C
  • 9120R1D
  • 9120R1E
Additional Cross Ref., Compatibility & Installation
This package deal includes an alternate replacement circuit board and a compatible topside control panel.
The old (original) topside control panel is outdated and not compatible.

This replacement package is only for systems with a 7 button (Standard) topside control panel.

Tip: if the existing topside control panel has 8 buttons, see Related Products below for the Deluxe topside package.

Note: Standard and Deluxe topside control panels are not interchangable and not upgradable to one another.

ATTENTION: Make sure the new Standard control panel will fit.
Control panel size: 7-1/4" x 3-1/8"

Please note: The new control panel has a button labeled "Aux" which is used for a jet pump or an air blower or an auxilary device.

ATTENTION: Some of these hot tub systems have an optional auxiliary topside control panel that is also outdated and not compatible with this alternate replacement circuit board.
If you have an optional auxiliary topside control panel, please contact us to inquire if a compatible one is available.
Tip: When replacing a hot tub circuit board, testing the heater and replacing it (if bad), is recommended before installing or applying voltage on a new circuit board.
Note: A continuity test is not a sufficient heater test. Contact us by phone for more details on testing a heater.

Tip: Burned circuit boards or burned heater relays are often due to a loose electrical connection or a bad heater or both.
If all connections are tight and if the heater is good then the heater relays are probably old and worn out.
If a burned relay was powering a pump and all electrical connections are tight then the relay is probably old and worn out or the pump might be bad or going bad or all three.
Replacing the heater and/or pump with a new one is recommended if any of those scenarios apply.

Tip: See RELATED PRODUCTS below for more Balboa 50770 9120R1(x) replacement options.

Unsure of what something on this page means?

Please contact us so we can better assist you.


  • Manufactured by: Balboa Water Group, Inc.
  • Part Number: 50770
  • Part Number: 9120R1(x)
  • Item Number: 22-3507-B


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