Balboa 53421 Circuit Board SPAC20R1(x) Alt Replacement, Spa Crest

Balboa 53421 Circuit Board SPAC20R1(x) Alt Replacement, Spa Crest
  • Manufactured by: Balboa Water Group, Inc.
  • Part Number: 53421
  • Chip Number: SPAC20R1(x)

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Item Number: 22-1588

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The Balboa 53421 SPAC20R1(x) circuit board is discontinued but we have options.

Option 1: Get your circuit board repaired.  Please contact us before sending items in for repair.

Option 2: Contact us to inquire about a new retro-fit system control box replacement.

The Balboa 53421 SPAC20R1(x) circuit boards are also found in hot tubs made by Spa Crest Inc. and possibly others.
Cross Reference Verification
Serial Numbers:
  • 53421
  • BAL53421
  • 53421-01

Chip Numbers:
  • SPAC20R1A
  • SPAC20R1B
  • SPAC20R1C
  • SPAC20R1D
  • SPAC20R1E
  • SPAC20R1F
Additional Cross Ref., Compatibility & Installation
ATTENTION: Control panel (topside) must have 8 buttons.
Do NOT place this order if your topside control panel doesn't have 8 buttons.
Instead give us a call.

Additional Install Instructions:
Do the following before applying power.
Set J50 jumper pin sleeve on one pin.

Set all other jumper pins, dip switches and wires the same as they are on the original (old) circuit board.

Sometimes after changing jumper pin sleeves and dip switches, the memory backup needs to be reset.
To reset the memory backup, locate J43 jumper pin and set the sleeve on both pins.
Upon powering up the memory backup will then reset itself and set the current settings into the memory backup.
After applying power, if the hot tub is working the way you are expecting it to work, then simpy turn the power off, set J43 on one pin and apply power again.
System Control Box Serial Numbers
Tip: The system control box is usually located below the hot tub and the circuit board mounts inside of it.

The Balboa 53421 SPAC20R1(x) circuit board can be found in the following hot tub system control boxes (but not limited to).

System Control Box Serial Numbers:
  • 53006-03
  • 53007-02
  • 53007HC2
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.
See RELATED PRODUCTS below for heater replacements.

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: Items shown in RELATED PRODUCTS below have also been found in hot tub systems with Balboa 53421 SPAC20R1(x) circuit boards.

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: 53421
  • Part Number: SPAC20R1(x)
  • Item Number: 22-1588

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