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Balboa 53426 Extension Relay Circuit Board

  • Manufactured by: Balboa Water Group, Inc.
  • Part Number: 53426
  • Chip Number: Extension Relay

$52.86

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Item Number: 22-1081

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The Balboa 53426 extension relay circuit boards are also found in hot tubs made by Leisure Bay Hot Tubs, Coast Spas, Hydro-Quip, Inc., Viking Spas and possibly others.
Please Note: The numbers on the new circuit board you receive may be different and the components may look slightly different but it will still connect the same and it is a fully compatible OEM replacement .
Cross Reference Verification
Tip: Locate the serial number on the old circuit board being replaced.
Tip: The serial number is on a sticker on the old circuit board (not the box).
Tip: The serial number is shown on the sticker preceded by S/N or P/N (part number).
Tip: The image above shows an example of a serial number sticker (click image to enlarge it).

Verify the serial number on the old circuit board being replaced is in this list.

Serial Numbers:
  • 53426
  • BAL53426
  • 3-60-0099
Additional Cross Ref., Compatibility & Installation
If a wiring diagram is shipped with this new circuit board (or emailed) then it shall override your existing wiring diagram.

Otherwise, set wires and/or jumper pins and/or dip switches on the new circuit board to match how they are on the existing circuit board (assuming the old circuit board is already set correctly as per the original wiring diagram on the existing control box).
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.

Please note: System control box serial numbers cannot identify a circuit board.
Please note: Do not use this section for confirmation of making the correct purchase.

The Balboa 53426 extension relay circuit board can be found in the following hot tub system control boxes (but not limited to).

System Control Box Serial Numbers:
  • 53755
  • 53787
  • 53889 (Balboa VS511SZ)
  • 54384
  • 54384-01
  • 54384-02
  • 54384-03
  • 54384-04 (Balboa VS511SZ)
  • 55053
  • 55053-01
  • 55053-02
  • 55053-03 (Balboa VS511SZ)
  • 54382
  • 54382-01
  • 54382-02
  • 54382-03
  • 54382-04
  • 54382-05 (Balboa VS511Z)
  • 53912 (X-FLOW Kit) 54311
  • 55029
  • 55029-01
  • 55029-02
  • 55029-03
  • 55029-04
  • 55029-05
  • 55885
  • 55885-01
  • 55885-S
  • 55885-S1
  • 55885-T
  • 55885-T1
  • 55885-T2
  • 53352
  • 53352-01
  • 55352-02 (Leisure Bay LB501S)
  • 53408
  • 53408-01
  • 53408-02 (Leisure Bay LB500S)
  • 53408
  • 53408-01
  • 53408-02 (Leisure Bay LB500S1)
  • 54350 (Viking Spas VKV500)
  • 54380 (Viking Spa VKV502)
  • 54382
  • 54382-01
  • 54382-02
  • 54382-03
  • 54382-04
  • 54382-05 (Coast Spas VS511Z)
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.

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: 53426
  • Part Number: Extension Relay
  • Item Number: 22-1081


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