🛠️ Jacuzzi® 6600-101 J-300 LCD Series Spa Circuit Board (3-Pump, for J-380 / J-385 Models, 2002–2006)

The current OEM replacement circuit board for 2002–2006 Jacuzzi® J-300 LCD Series J-380 and J-385 3-Pump hot tubs, shipping with EPROM Rev 9.70B — the specific chip configuration that enables 3-pump control on the J-300 LCD platform.

📋 Product Overview

The Jacuzzi® 6600-101 is the current OEM main circuit board for Jacuzzi® J-300 LCD Series J-380 and J-385 hot tubs manufactured between 2002 and 2006 in the North American 60 Hz market. This board controls the spa’s three jet pumps, heater, ozonator, spa lighting (including footwell and waterfall accent lights), and topside communication through a 10-button LCD control panel (2600-323, which replaced the earlier 2600-303 in July 2005).

A critical distinguishing feature of the 6600-101 is its EPROM Rev 9.70B chip. Per the official Jacuzzi® Partners “North America 60 Hz Circuit Board History” documentation: “The 6600-092 and 6600-101 boards are identical with the exception of their Eprom chip.” The 6600-092 (EPROM 9.50B) configures the same physical PCB for Sundance® 850 LCD 2-pump 2-speed P1 operation; the 6600-101 (EPROM 9.70B) configures it for Jacuzzi® J-380/J-385 3-pump operation. This EPROM is what determines which board is correct for your spa — always verify your existing chip revision before ordering.

The 6600-101 uses a ribbon cable connection to the topside and pairs with Jacuzzi®-specific companion parts: temperature sensor 6600-167, hi-limit sensor 6600-168, flow switch 6560-860, and the J-300 Series LCD topside 2600-323. Some distributor listings describe this board as “Pro-Tec LCD” configuration.

⚠️ This board is specifically for 2002–2006 Jacuzzi® J-380 and J-385 3-pump models. It is NOT a universal J-300 Series board — other J-300 LCD Series models (J-350/355, J-360/365, J-370/375) use different boards (typically 6600-092 → current 6600-730 for 2-speed P1 configurations). It is also NOT for post-2006 J-300 LED Series models, which use entirely different boards. ⚠️ Verify your EPROM chip revision before ordering. If your existing board has a 9.50B chip, you need the 6600-092 → current 6600-730 (for Sundance® 850 LCD 2-pump). If your chip is 9.70B, the 6600-101 is correct. ⚠️ This board is NOT a Jacuzzi® J-485 3-pump J-400 Series board. Despite the similar “J-385” naming, J-485 is a J-400 Series spa and uses a different J-400 Series 3-pump board.

✨ Key Features

• ✅ Current OEM Jacuzzi® replacement part – factory-new with EPROM Rev 9.70B pre-installed
• ✅ Dedicated 3-pump control – for Jacuzzi® J-380 and J-385 models (2002–2006)
• ✅ EPROM Rev 9.70B – specific chip configuration for 3-pump J-300 LCD logic
• ✅ Ribbon cable topside connection – compatible with 2600-323 (and replaced 2600-303) LCD topside panel
• ✅ Same physical PCB as 6600-092 – only the EPROM differs (9.70B vs 9.50B)
• ✅ LCD topside communication – for 10-button 2600-323 control panel
• ✅ Supports J-300 LCD platform accent lighting – footwell light 6560-420 and waterfall light 6560-422
• ✅ Designed for North American 60 Hz market
• ✅ Covered by manufacturer’s limited warranty

🔧 Technical Specifications

Specification	Value
OEM Part Number	6600-101
Also Listed As	SD6600-101
Platform	Jacuzzi® J-300 LCD Series (60 Hz North American)
Spa Configuration	3-Pump
EPROM Chip	Rev 9.70B
Same-PCB Counterpart	6600-092 (EPROM Rev 9.50B, for Sundance® 850 LCD 2-pump 2-speed P1 — now replaced by current 6600-730)
Model Coverage	Jacuzzi® J-380 and J-385 only
Production Years Covered	2002–2006
Topside Connection	Ribbon cable (male + female 10-pin connectors)
Compatible Topside	2600-323 (2002–2006 J-300 LCD, 10-button, replaced 2600-303 in July 2005)
Temperature Sensor	6600-167 (J-300/J-400 LCD Temp Sensor, Box End connectors)
Hi-Limit Sensor	6600-168 (LCD Hi-Limit Sensor with Box Ends)
Flow Switch	6560-860 (J-300 LCD Series)
Footwell Light	6560-420 (supports J-300 LCD Series 2002–2006 and J-300 LED 2005–2006)
Waterfall Light	6560-422
Distributor Description	Pro-Tec LCD, 3-Pump, Ribbon Cable
Non-Returnable	✅ Yes — final sale
Warranty	Manufacturer’s limited warranty

📌 Electrical supply voltage is spa-model-specific. Jacuzzi® J-380 and J-385 spas typically ship configured for 240 V / 60 Hz service in the US market, but your spa’s specific electrical configuration is listed on the data plate inside the equipment bay. Always verify against your data plate before connecting power. No universal voltage/amperage rating is published for the bare 6600-101 PCB by the manufacturer — the configuration depends on the specific spa model’s installed heater, pumps, and service supply.

🔗 Compatibility Guide

Covered Jacuzzi® J-300 LCD Series Models

Model	Years	Pump Configuration
♨️ Jacuzzi® J-380	2002 – 2006	3-Pump LCD
♨️ Jacuzzi® J-385	2002 – 2006	3-Pump LCD

📌 Model-year note: The 6600-101 covers the entire 2002–2006 production run of the J-380 and J-385. Within this range, the topside panel transitioned from 2600-303 to the current 2600-323 in July 2005 — both topside revisions are compatible with the 6600-101 board.

Compatible Topside Panels

Topside PN	Years	Description
2600-323	07/2005 – 2006 (current replacement)	10-button LCD panel — Select, Cycle, Display, Mode, Screen Invert, Temp+ / Temp–, Light/Dimmer, Pump #1, Pump #2. Two ribbon cables with 10-pin male and female connectors. Used across 2002–2006 J-350/355, J-360/365, J-370/375, and J-380/385
2600-303	2002 – 07/2005	Original topside for 2002–07/2005 J-380/J-385 — replaced by 2600-323 in July 2005
2600-324	Remote / Auxiliary LCD panel	Compatible secondary / remote panel for J-370/375 and J-380/385 (plugs into the male connector on 2600-323)

📌 3-pump control via 2-pump topside button layout: The 2600-323 topside has two jet-pump buttons (Pump #1 and Pump #2), but the 6600-101 board (with EPROM 9.70B) is configured to drive three pumps. This follows the same convention used on Sundance® Maxxus® 3-pump spas, where the Pump 2 button operates both Pump 2 AND Pump 3 simultaneously on the 3-pump variant boards.

Companion Components (Matching Parts)

Component	Part Number	Notes
Temperature Sensor	6600-167	2002+ J-300 LCD / J-400 LCD temp sensor, Box End connectors
Hi-Limit Sensor	6600-168	LCD Hi-Limit Sensor with Box Ends, 2002+ J-300 LCD Series
Flow Switch	6560-860	J-300 LCD Series with box-end connectors
Footwell Light	6560-420	J-300 LCD Series 2002–2006 (and J-300 LED Series 2005–2006) with phone-jack connector
Waterfall Light	6560-422	J-300 LCD Series accent light
Pump 2 Relay	T92S7A22-240	240V Pump 2 relay for J-380/J-385 (Zettler current replacement for discontinued Potter-Brumfield relay)

Same-PCB / Different-EPROM Relationship

Per the official Jacuzzi® Partners North America 60 Hz Circuit Board History documentation: “The 6600-092 and 6600-101 boards are identical with the exception of their Eprom chip.”

Board	EPROM	Configuration
6600-101 (this board)	Rev 9.70B	Jacuzzi® J-300 LCD 3-Pump for J-380 / J-385
6600-092	Rev 9.50B	Sundance® 850 LCD 2-Pump 2-Speed P1 (discontinued; current replacement is 6600-730)

🚨 Critical: Because these two boards look physically identical, misidentifying which EPROM you need is the single biggest ordering error risk. Verify your existing chip’s printed revision (9.70B vs 9.50B) before ordering. A 6600-101 with 9.70B will NOT run a Sundance® 850 LCD 2-pump 2-speed spa correctly, and a 6600-092 / 6600-730 with 9.50B will NOT run a Jacuzzi® J-380/J-385 3-pump spa correctly.

NOT Compatible — Use a Different Board

Your spa	Correct Replacement
❌ Jacuzzi® J-350/355, J-360/365, J-370/375 (2002–2006, 2-pump J-300 LCD)	Different J-300 LCD board (6600-092 predecessor → current 6600-730 for 2-speed P1)
❌ Jacuzzi® J-310, J-315, J-320, J-325, J-330 (J-300 LED Series, 2-pump or convertible)	6600-042/089/289 → current 6600-722 (J-200/J-300 LED 1-pump, LX-15 family)
❌ Post-2006 Jacuzzi® J-300 LED Series	6600-297 (2014–2015 J-300 LED 2-pump) or 6600-296 (1-pump) — AND 2016+ models use 6600-784 / 6600-786 / 6600-420 / 6600-412 by year
❌ Jacuzzi® J-400 Series (J-460, J-465, J-470, J-480) 2006–Mid 12/2009 2-pump	6600-728 (2 × 1-speed P1) or 6600-730 (2-speed P1)
❌ Jacuzzi® J-485 3-pump (J-400 Series)	Different J-400 Series 3-pump board — contact Parts4Tubs
❌ Sundance® 850 LCD 2-Pump 2-Speed P1	6600-730 (covers the 6600-092 9.50B EPROM variant)
❌ Sundance® 880 LCD 2 × 1-Speed pumps	6600-728
❌ Sundance® 880 NT 2-Pump (2008+)	6600-390
❌ Sundance® 880 NT Maxxus® / Aspen® 3-Pump	6600-392
❌ Sundance® 850 NT Maxxus® 3-Pump (2002–2004)	6600-094

🎛️ Board Functions & Controls

Controlled Outputs

Output	Function
Pump 1	Primary jet pump
Pump 2	Secondary jet pump (shares Pump 2 button on 2600-323 topside with Pump 3)
Pump 3	Third jet pump (activated via Pump 2 button on 2600-323 topside in 3-pump configuration)
Heater	J-300 LCD flow-through heater (per spa’s factory configuration)
Ozonator	Supported (per spa’s factory configuration)
Spa Lighting	Via 6560-420 footwell light and 6560-422 waterfall light accent circuits
Topside Interface	2600-323 (10-button LCD) or predecessor 2600-303 via ribbon cable

Topside Button Mapping (2600-323)

The 2600-323 topside provides the following user controls for the 6600-101 board:

Button	Function
Select	Menu / mode selection
Cycle	Cycle through options or settings
Display	Display mode toggle
Mode	Operating mode selection
Screen Invert	Invert LCD screen orientation (for various spa positions)
Temp + / Temp −	Raise / lower temperature setpoint
Light / Dimmer	Spa light on/off and dimmer control
Pump #1	Primary jet pump control
Pump #2	Secondary jet pump control (controls both Pump 2 AND Pump 3 on 3-pump 6600-101 configuration)

🛠️ Installation Requirements

⚠️ IMPORTANT: Hot tub circuit board installation must be performed by a licensed electrician in compliance with NEC (National Electrical Code) Article 680 and all local codes. A permit may be required in your jurisdiction.

Pre-Installation Checklist

• [ ] Confirm your spa is a Jacuzzi® J-380 or J-385 manufactured between 2002 and 2006
• [ ] Confirm your spa has a 3-pump configuration
• [ ] Verify your existing EPROM chip is Rev 9.70B (not 9.50B) — if 9.50B, you need the 6600-092 → 6600-730 instead
• [ ] Note your existing topside panel (2600-303 for 2002–07/2005 or 2600-323 for 07/2005–2006)
• [ ] Disconnect all power at the main breaker and the external GFCI disconnect box
• [ ] Wait at least 5 minutes for capacitors to fully discharge
• [ ] Photograph every wire, harness, and ribbon-cable connector position before removing the old board
• [ ] Inspect the temperature sensor (6600-167), hi-limit sensor (6600-168), and flow switch (6560-860) — replace if aged
• [ ] Inspect the Pump 2 relay (T92S7A22-240) — a common wear point on 3-pump J-380/J-385 spas
• [ ] Confirm the footwell light (6560-420) and waterfall light (6560-422) connectors are intact

Electrical Requirements (US)

Requirement	Specification
Supply Voltage	Per spa data plate (typically 240 V / 60 Hz for US J-380 / J-385 models)
Frequency	60 Hz (US standard)
GFCI Protection	Required (NEC Article 680)
Ground / Bonding	Mandatory equipment grounding and bonding per NEC Article 680
Dedicated Circuit	Required
Disconnect Box	Required within line of sight of spa (per NEC)
Wire Gauge	Per spa data plate and NEC ampacity tables

💡 Installation tip: The 6600-101 uses a ribbon cable topside connection. Before removing the existing ribbon cable from the old board, note the orientation of the cable (male connector goes to remote/auxiliary topside 2600-324 if present; female connector plugs onto the circuit board). A reversed ribbon cable will not damage the board but will cause the topside to not communicate properly.

⚠️ Safety Warnings

Electrical Safety

• ⚠️ ALWAYS disconnect power at both the main breaker and the exterior GFCI disconnect box before any work
• ⚠️ Licensed electrician only — NEC Article 680 and most US local codes require it
• ⚠️ Verify GFCI protection is installed and tested
• ⚠️ Equipment grounding and bonding must comply with NEC Article 680
• ⚠️ Never operate the spa with the electrical compartment cover removed

EPROM Verification Safety

• ⚠️ Verify your existing chip is Rev 9.70B before ordering the 6600-101. Installing a 9.70B board (6600-101) on a 9.50B spa (Sundance® 850 LCD 2-pump) will cause incorrect pump control behavior — and vice versa.
• ⚠️ Do NOT attempt to swap just the EPROM chip between a 6600-092 and 6600-101. While the PCBs are physically identical, Jacuzzi® / Sundance® sells these as complete boards only — the EPROMs are not individually available as consumer service parts.

Platform / Configuration Safety

• ⚠️ Do NOT install the 6600-101 on a 2-pump J-300 LCD spa (J-350/355/360/365/370/375) — use the appropriate 2-pump board instead
• ⚠️ Do NOT install the 6600-101 on a J-300 LED Series spa (post-2006) — the LED Series uses entirely different boards
• ⚠️ Do NOT install the 6600-101 on a J-400 Series spa — J-400 Series uses different boards (6600-728 / 6600-730 for 2-pump, separate 3-pump J-400 board for J-485)
• ⚠️ Do NOT pair this board with any topside other than the 2600-323 or 2600-303 — other topsides use incompatible communication protocols

Water & Electrical Safety

• ⚠️ Ensure no water ingress into the control box during installation
• ⚠️ Inspect all gaskets and seals; replace if damaged
• ⚠️ Never touch any electrical component with wet hands

Post-Installation

• ⚠️ Verify the topside panel displays correctly on first power-up
• ⚠️ Confirm all three jet pumps operate correctly (Pump 1 button → Pump 1 runs; Pump 2 button → Pump 2 AND Pump 3 run together)
• ⚠️ Verify the heater cycles properly
• ⚠️ Test the hi-limit function and GFCI trip before allowing bathers in the spa
• ⚠️ Monitor for fault codes during the first 24 hours of operation

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🔍 Error Codes & Troubleshooting

Common Jacuzzi® J-300 LCD Platform Codes

Code	Meaning	Basic Troubleshooting
FLO	Pressure / flow switch fault	Clean filter; check plumbing blockages; inspect flow switch 6560-860
OH / OHH	Overheating detected	Allow water to cool; verify circulation flow; check temperature sensor 6600-167
Sn	Sensor malfunction	Check hi-limit sensor 6600-168 and temperature sensor 6600-167 connections; replace if out of spec
HFL	Heater flow / sensor discrepancy	Clean filter; verify circ flow; inspect temperature sensors
ICE	Freeze-risk condition detected	Verify heater function; raise setpoint; check ambient temperature
Cool	Water temperature significantly below setpoint	Verify heater operation; confirm heater breaker
Pump 2 or Pump 3 not responding	Pump 2 relay (T92S7A22-240) failed, or pump wiring issue	Test Pump 2 relay; verify pump wiring continuity

⚠️ Fault code behavior may vary based on specific J-380 / J-385 year and topside firmware revision. Consult your spa’s owner’s manual for model-specific diagnostics.

🎯 Ideal Applications

Application	Suitability	Notes
♨️ 2002–2006 Jacuzzi® J-380 replacing an aged 6600-101	✅ Direct OEM replacement	Current revision with EPROM Rev 9.70B
♨️ 2002–2006 Jacuzzi® J-385 replacing an aged 6600-101	✅ Direct OEM replacement	Current revision with EPROM Rev 9.70B
🛁 Jacuzzi® J-350/355, J-360/365, J-370/375 (2-pump J-300 LCD)	❌ Not compatible	Use 6600-092 → current 6600-730 for 2-speed P1 variants
🛁 Sundance® 850 LCD 2-pump 2-speed P1	❌ Not compatible	Use 6600-730 (covers the 6600-092 / EPROM 9.50B variant)
🛁 Post-2006 J-300 LED Series	❌ Not compatible	Use 6600-297 (2014–2015 2-pump) / 6600-296 (1-pump) / 6600-784 or 6600-420 (later years)
🛁 Jacuzzi® J-400 Series 3-pump (J-485)	❌ Not compatible	Different J-400 Series 3-pump board — contact Parts4Tubs

🤔 Frequently Asked Questions

Q: My spa is a 2004 Jacuzzi® J-385. Is this the right board? A: Yes — provided your existing chip is Rev 9.70B. The 6600-101 is the current OEM replacement for 2002–2006 Jacuzzi® J-380 and J-385 3-pump J-300 LCD Series spas, shipping with the correct EPROM Rev 9.70B chip.

Q: How do I know if my board needs the 6600-101 (9.70B EPROM) or the 6600-092 / 6600-730 (9.50B EPROM)? A: Look at the software chip label on your existing board. These two boards are physically identical — the only difference is the EPROM chip:

• EPROM Rev 9.70B = 6600-101 (Jacuzzi® J-380/J-385 3-pump J-300 LCD)
• EPROM Rev 9.50B = 6600-092 → current 6600-730 (Sundance® 850 LCD 2-pump 2-speed P1)

You can also identify by your spa brand and pump count: Jacuzzi® J-380/J-385 3-pump = 6600-101; Sundance® 850 LCD 2-pump = 6600-730.

Q: Can I install a 6600-101 on a Sundance® spa, or a 6600-730 on my Jacuzzi® J-385? A: No. Even though the PCBs are physically identical, the EPROMs configure entirely different pump logic. A 9.70B EPROM on a 2-pump spa will not operate the pumps correctly, and a 9.50B EPROM on a 3-pump spa will not control Pump 3. Always match the EPROM to the spa’s original configuration.

Q: Does my 2600-303 topside need to be replaced when I install the 6600-101? A: Not necessarily. The 2600-303 (original 2002–07/2005 topside) and the 2600-323 (current 07/2005–2006 topside) are both compatible with the 6600-101. If your existing 2600-303 is functional, retain it. If it is damaged or unresponsive, replace it with the current 2600-323 (which is the factory replacement for the 2600-303).

Q: My topside only has a Pump 1 and Pump 2 button — how does the board control 3 pumps? A: On the 6600-101 3-pump configuration, the Pump 2 button controls both Pump 2 AND Pump 3 simultaneously. This is the same convention used on Sundance® Maxxus® 3-pump spas with the 6600-860 topside (per Sundance® documentation for the Maxxus® 2005–2008 models: “Pump 2 button operates both pumps 2 and 3”). The EPROM 9.70B chip on the 6600-101 handles this pump-button multiplexing internally.

Q: What temperature and hi-limit sensors does this board use? A: The 6600-101 uses Jacuzzi® J-300 LCD Series sensors with Box End connectors:

• Temperature sensor: 6600-167 (also compatible with J-400 LCD Series)
• Hi-limit sensor: 6600-168
• Flow switch: 6560-860

These are distinct from the Sundance®/Jacuzzi® 4-pin Balboa Water Group sensors used on the LX-15 / Sweetwater platform (6600-720 / 6600-726).

Q: My spa has accent lighting (footwell and waterfall). Does the 6600-101 control those? A: Yes. The 6600-101 drives the 6560-420 footwell light (with phone-jack connector) and the 6560-422 waterfall light accent circuits that are standard on J-380 and J-385 spas.

Q: Is the 6600-101 still a current OEM part, or has it been discontinued? A: The 6600-101 is still a current active OEM Jacuzzi® part for 2002–2006 J-380/J-385 3-pump applications. Unlike the 6600-092 (which has been consolidated into the current 6600-730 for Sundance® 850 LCD 2-pump applications), the 6600-101 has NOT been consolidated — it remains its own current OEM part number because the 9.70B EPROM 3-pump configuration is specific to Jacuzzi® J-380/J-385 and is not interchangeable with the current 6600-730 board.

Q: My spa is a J-485. Is the 6600-101 the right board? A: No. Despite the similar naming, the J-485 is a Jacuzzi® J-400 Series 3-pump spa — a completely different platform from the J-300 LCD Series. The 6600-101 does NOT work on J-485. Contact Parts4Tubs with your J-485 year and existing board part number for the correct J-400 Series 3-pump board.

Q: My existing board has a “9.50B” chip label but my spa is a Jacuzzi® 3-pump. What’s going on? A: This is unusual and suggests one of a few possibilities:

1. Your spa may have been incorrectly repaired at some point with a 6600-092 (Sundance® 850 LCD 2-pump) board, which would prevent Pump 3 from operating correctly.
2. You may have a J-350/355/360/365/370/375 (2-pump J-300 LCD) rather than a J-380/J-385.
3. The chip label may be worn or mis-read.

Contact Parts4Tubs with clear photos of your spa’s model identification plate, your existing board label, and your chip label to confirm the correct current replacement before ordering.

Q: Do I need a licensed electrician to install this? A: Yes. NEC Article 680 and most US local jurisdictions require a licensed electrician for all hot tub electrical work, and a permit may be required.

Q: Is this an OEM or aftermarket board? A: The 6600-101 is the genuine OEM Jacuzzi® replacement board, factory-new with EPROM Rev 9.70B pre-installed.

✅ Why Choose the 6600-101

• ✅ Genuine OEM Jacuzzi® replacement – factory-new with EPROM Rev 9.70B pre-installed
• ✅ Specifically configured for 3-pump J-300 LCD Series operation on J-380 and J-385 models
• ✅ Current active OEM part number — not discontinued or consolidated
• ✅ Direct-fit mounting – same PCB footprint as the original 6600-101 and the physically identical 6600-092
• ✅ Drives full J-380/J-385 feature set — 3 jet pumps, heater, ozonator, accent lighting (footwell and waterfall)
• ✅ Compatible with both original 2600-303 and current 2600-323 LCD topside panels
• ✅ Backed by the Jacuzzi® manufacturer’s limited warranty

🇺🇸 Why Buy From Parts4Tubs

• ✅ Fast US shipping
• ✅ Expert EPROM disambiguation help — the #1 ordering error on this board is confusing the 6600-101 (9.70B / Jacuzzi® 3-pump) with the physically identical 6600-092 (9.50B / Sundance® 2-pump). Send us a photo of your existing chip label and we’ll confirm which board is correct before you order.
• ✅ Platform-history expertise across the full Jacuzzi® J-300 Series lineage — LCD Series (2002–2006 → 6600-101 / 6600-092), LED Series 2-pump (2014–2015 → 6600-297), LED Series 1-pump (→ 6600-296), and post-2016 platforms (6600-784 / 6600-786 / 6600-420 / 6600-412)
• ✅ Competitive pricing on current OEM boards
• ✅ Full manufacturer warranty support
• ✅ Matching companion parts in stock — 2600-323 topside, 6600-167 temperature sensor, 6600-168 hi-limit sensor, 6560-860 flow switch, 6560-420 footwell light, 6560-422 waterfall light, T92S7A22-240 Pump 2 relay, and related J-380/J-385 service parts

⭐ Summary

The Jacuzzi® 6600-101 is the current OEM replacement circuit board for 2002–2006 Jacuzzi® J-300 LCD Series J-380 and J-385 3-pump hot tubs in the North American 60 Hz market, shipping with EPROM Rev 9.70B pre-installed. The board is physically identical to the 6600-092 (Sundance® 850 LCD 2-pump 2-speed P1, EPROM Rev 9.50B — now replaced by the current 6600-730) with the only difference being the EPROM chip’s pump configuration logic. Pairs with the Jacuzzi® 2600-323 10-button LCD topside panel (or the predecessor 2600-303) via ribbon cable, plus companion parts: 6600-167 temperature sensor, 6600-168 hi-limit sensor, 6560-860 flow switch, 6560-420 footwell light, and 6560-422 waterfall light. The 2600-323 topside’s Pump 2 button operates both Pump 2 and Pump 3 simultaneously in the 3-pump configuration. Not compatible with other J-300 LCD 2-pump models (J-350/355/360/365/370/375), post-2006 J-300 LED Series, J-400 Series (including J-485 3-pump), Sundance® 850/880 LCD, Sundance® 880 NT, or LX-15 / Sweetwater platforms. Verify EPROM Rev 9.70B before ordering. Non-returnable; manufacturer’s limited warranty.

Finding and identifying a replacement Hot Tub Circuit Board (PCB)

If you are looking to replace a failed PCB on your Hot Tub’s spa pack, then quite often identifying the part that you need can be the hardest thing.

Firstly, you are looking for a model number on the actual circuit board itself. Having the model or serial of your hot tub is not going to help at this point, you need to find the number on the PCB itself.

Now, with certain brands of PCB, the number of the replacement PCB that you need is not going to match identically the one you are replacing. Why is that I hear you ask?

Well, normally, it is an updated version. This means that it might have updated firmware on the PCB or be a later revision. Normally, this means that the part number would be slightly different. This is usually indicated with a “12345678 -x” at the end of that part number where x indicated a firmware revision.

In some cases, there will be some following letters on the part number of the circuit board, “12345678 -x MAS” this can indicate that the PCB was used for an OEM meaning it was produced for a certain hot tub manufacturer and the letters identify the manufacturer.

This means if you source an original PCB, it will not have the letters, but will in most cases work just fine.

It can be confusing I know!

What if you can’t find a model number?

If you can’t find a model number on the PCB itself, then you need to look for a model number on the spa pack. Normally, there is a sticker on the outside of the spa pack that tells you the current ratings and input voltages etc and this will have a model number.

In general, most spa packs in the USA are manufactured by Balboa, Hydro-Quip, ACC or Gecko. I know I am generalising here, but if you have a spa pack that has the brand of your hot tub on, it will be an OEM so the key is identifying who made the original box.

From there, you can normally find an original PCB that you will be able to switch out.

For example, the Balboa VS (value series) is a very popular spa pack that has been used by multiple hot tub manufacturers under their own brand names. Whatever they have called it, strip it back and it is still a Balboa VS.

Visual Inspection

One of the most important things you can do when you are looking for a replacement is to visually inspect the PCB that you have versus the picture online of the replacement you are considering. They need to look the same even if there are the differences in firmware revisions or OEM part numbers, you should be visually replacing a PCB that looks like the one you have.

Configuring a replacement Hot Tub Circuit Board (PCB)

When you get a new PCB, you are more than likely going to need to configure it. Most PCBs have a number of different modes and setups that the can operate in. For this, you will need to manual or spec sheet to guide you.

For things like DIP switches, most of the time you can copy the settings from your original circuit board. You are looking for things like setting the voltage as a lot of PCBs can be configured to run on both 115V and 230V.

You may need to move jumpers or even wires to configure voltages – the key here is that you read the schematic and don’t expect the PCB to just work out of the box – it usually doesn’t.

Troubleshooting a Hot Tub Circuit Board (PCB)

Here are some common things you will see when you replace a PCB on a hot tub.

You press the buttons on the topside control and they don’t control the right parts (pumps or blower etc) – this is a mode configuration thing and you will either need to change some DIP switches on the PCB or an internal or low level programming mode on the topside control. Check the manual for how to do this.

You turn on the hot tub and it trips the breaker – it is not common for a new PCB to fail out of the box (I have not seen one yet!) However, a common mistake is that the voltage has not been set correctly. If it is set for 115V and then you try and turn it on, the current draw will be a lot more (twice) than expected and the breaker will trip.

To check this, unplug all of your kit – heater, pumps, blower and then turn on the PCB. If it trips with nothing plugged in, usually the voltage is incorrectly set and what is happening is that live current is being sent to the ground – because you have 4 wires into the PCB rather than 3. Current on the ground loop causes the trip. Check the settings to make sure it is configures for 230V.

It might not trip until you physically turn on a pump or a blower. As mentioned, if the pack is set to 115V and your pump is meant for 230V, it will draw twice the current at half the voltage and trip your breaker. Check the manual for info on how to set the voltage.