⚙️ Cal Spas M1 Super Duplex Circuit Board — ELE09100205 — 2100 / CS5000 Series Spa Control

OEM Cal Spas M1 Super Duplex replacement board for the Cal Spas 2100 and CS5000 control systems.

⚠️ IMPORTANT — PLEASE READ BEFORE ORDERING

• “XL Heater Only” system. This board (ELE09100205) is specifically designed for Cal Spas systems using the Cal Spas XL Heat Exchanger (part F2550-0011, 5.5kW/240V). It is not confirmed as compatible with standard flow-through heater configurations. Verify your heater type from the system label before ordering.
• Identify by chip number and Balboa board number. Your existing board’s white sticker should show a chip number of C2100R1(x) (revisions A through E) or CS5000R1D (or newer letter revision). The Balboa 5-digit board number 52299 will also appear. Confirm both before ordering.
• Filter cycle reduction when replacing C2000R2(x) boards. If your old board had chip numbers C2000R2A, C2000R2B, or C2000R2C, note that the default filter cycle will drop from 4 hours to 2 hours after installing ELE09100205. This is expected behavior — the cycle can be adjusted manually.
• Non-returnable. Cal Spas circuit boards cannot be resold as new to another owner. Confirm compatibility before ordering.
• Do not order by spa model name alone. Identify by chip number and Balboa board number 52299 as described above.

💧 Product Overview

The Cal Spas M1 Super Duplex circuit board (OEM part number ELE09100205, Balboa board number 52299) is a genuine Cal Spas OEM replacement PCB manufactured by Balboa Water Group. It is the standard replacement board for the Cal Spas 2100 series control system and the CS5000 control system — both of which use the Cal Spas XL Heat Exchanger configuration.

This board uses an 8-pin phone-style cable topside connector and a square PCB form factor. It is compatible with the Balboa Sensor Assembly 30337 (BAL30337), the Cal Spas XL Heat Exchanger (F2550-0011, 5.5kW/240V), and the Cal Spas topside panel ELE09200778 (54283-03).

The current production revision ships with chip CS5000R1D. Earlier revisions C2100R1A through C2100R1E are all covered by this same OEM part number.

✨ Key Features

✅ Genuine Cal Spas OEM PCB — manufactured by Balboa Water Group
✅ Board name: M1 Super Duplex Circuit Board
✅ Chip CS5000R1D (current shipping revision) — covers all C2100R1(x) revisions A through E
✅ Balboa Board PN: 52299 — also listed as 52199 / 52299-01 / 52299-02 / 52299-03
✅ 8-pin Phone Style Cable topside connector — standard Cal Spas 2100/CS5000 format
✅ Square PCB form factor — direct physical replacement
✅ Light output jumper — field-selectable 12V (single spa light) or 120V (fiber optic lighting)
✅ Compatible with Cal Spas XL Heat Exchanger — F2550-0011, 5.5kW/240V
✅ Compatible with Balboa Sensor Assembly 30337 — standard Temp/Hi-Limit sensors
✅ Compatible with 220V and 110V transformer configurations — BAL30274-2 (220V) or BAL30274-1 (110V)
✅ Broad chip cross-reference — replaces C2100R1A–R1E, CS5000R1D, C2000R2A–R2C, and others
✅ 30-day limited warranty (Cal Spas policy)

🔩 Technical Specifications

Specification	Value
Cal Spas OEM Part Number	ELE09100205
Alternate Cal Spas Formats	CALELE09100205 / ELE09100205-R1D / CALELE09100205-R1D
Balboa Board PN	52299 (also: 52199 / 52299-01 / 52299-02 / 52299-03)
Board Name	M1 Super Duplex Circuit Board
Chip Number (current shipping)	CS5000R1D (newer revisions may end with any letter)
Chip Numbers Covered	C2100R1A, C2100R1B, C2100R1C, C2100R1D, C2100R1E, CS5000R1D
System	Cal Spas 2100 Series / CS5000 System
Heater Compatibility	Cal Spas XL Heat Exchanger (F2550-0011, 5.5kW/240V) — XL Heater Only
PCB Shape	Square
Topside Connector	Phone Style Cable — 8-pin
Compatible Sensor	Balboa Sensor Assembly 30337 (BAL30337)
Compatible Topside	ELE09200778 (Balboa 54283-03)
Compatible Transformer	BAL30274-2 (220V) or BAL30274-1 (110V) — check wiring diagram
Compatible Pressure Switch Cable	21224
Light Output Jumper	12V (single spa light) or 120V (fiber optic) — field-selectable
Relay Type	Closed relays (new style — hooks same as original)
Input Voltage	Confirm from your spa’s system label or contact Parts4Tubs
Heater kW / Service Amperage	Confirm from your spa’s system label or contact Parts4Tubs
Warranty	30-day limited (Cal Spas policy)
Returns	Non-returnable

⚠️ This board is designed for systems with the Cal Spas XL Heat Exchanger. Do not install in a system with a standard flow-through heater without first verifying compatibility with Parts4Tubs.

🔗 Compatibility Guide

Compatible Cal Spas Systems:

System	Notes
Cal Spas 2100 Series	Primary system — chip C2100R1(x)
Cal Spas CS5000 System	Covered — chip CS5000R1D / CS5000R1(x)

How to Identify Your Existing Board:

1. Open the spa equipment compartment and locate the circuit board
2. Find the white sticker on or near the board
3. Chip number should show C2100R1(x) (R1A through R1E) or CS5000R1D (or newer revision)
4. Balboa 5-digit number should show 52299
5. Confirm both numbers before ordering

Compatible Accessories:

Part Number	Description
BAL30337 (30337)	Balboa Temperature/Hi-Limit Sensor Assembly
ELE09200778 (54283-03)	Cal Spas Topside Control Panel — 6000/6100 / 5100/5200
F2550-0011	Cal Spas XL Heat Exchanger, 5.5kW/240V
21224	Pressure Switch Cable
BAL30274-2	Balboa 220V Transformer
BAL30274-1	Balboa 110V Transformer

Cross-Reference — Boards This Replaces:

Original Part / Chip	Description
C2100R1A, C2100R1B, C2100R1C, C2100R1D, C2100R1E	All C2100R1 revisions — direct replacement
CS5000R1D and newer letter revisions	CS5000 system chip — direct replacement
CS2100R1A, CS2100R1B	CS2100 system variants — direct replacement
52199 / ELE09100090	Cal Spas Control Box model 2100 S DUP 99 (chip C2100R1E)
52704 / Control Box CS5000 DU-CS5000-CCA	CS5000R1(x) — direct replacement
CS5300R1B / ELE09100214 / 53632 / 10-312-3632	CS5300 system — factory-recommended replacement
C2000R2A, C2000R2B, C2000R2C	C2000 system boards — replacement with filter cycle note
ELE09100060 / 50855 / C2000RIC	Older C2000 boards
ELE09100280	Discontinued — replaced by ELE09100205

⚠️ Filter cycle reduction note: When replacing C2000R2(x) boards (C2000R2A, R2B, R2C), the default filter cycle will drop from 4 hours to 2 hours. Adjust the filter cycle setting via the topside panel after installation.

🎛️ Board Functions

Light Output Jumper: Located just to the right of the glass fuse running vertically on the board. This jumper sets the lighting circuit voltage:

• 12V position — for a standard single spa light
• 120V position — for fiber optic lighting systems

Set this jumper to match your spa’s lighting configuration before installing the board.

Relay Design Note: The current production ELE09100205 has closed relays. The mounting hook style is unchanged from the original board — direct physical replacement with no bracket modifications required.

🛠️ Installation Requirements

⚠️ Installation must be performed by a licensed electrician in compliance with NEC and all applicable local codes.

Pre-Installation Checklist:

• [ ] Confirm chip number on existing board (C2100R1A–R1E or CS5000R1D)
• [ ] Confirm Balboa board number 52299 on sticker
• [ ] Confirm your system uses the Cal Spas XL Heat Exchanger (F2550-0011)
• [ ] Note existing DIP switch and jumper settings before removal
• [ ] Check and note current light jumper position (12V or 120V)
• [ ] Confirm voltage configuration from system label (220V or 110V)
• [ ] Disconnect all power at GFCI breaker or disconnect
• [ ] Allow 5 minutes for capacitor discharge after power-off
• [ ] Photograph all wiring connections before removal

Electrical Requirements:

Requirement	Specification
Supply Voltage	Confirm from spa system label
GFCI Protection	Class A GFCI required — NEC Article 680
Ground & Bonding	Required — NEC Article 680
Dedicated Circuit	Required
Disconnect Box	Within line of sight, at least 5 ft from spa
Wire Type	Copper conductors only

⚠️ Always confirm voltage and service amperage from the system label. Do not assume based on spa model name or appearance.

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⚠️ Safety Warnings

• ⚠️ ALWAYS disconnect all power before circuit board work
• ⚠️ Licensed electrician installation required; NEC Article 680 compliance mandatory
• ⚠️ Class A GFCI required; grounding and bonding required per NEC Article 680
• ⚠️ Verify from system label — this board supports both 220V and 110V configurations; wrong voltage selection causes breaker trips or equipment damage
• ⚠️ XL Heater systems only — confirm heater compatibility before installing
• ⚠️ Set light jumper to correct position (12V or 120V) before powering up
• ⚠️ Non-returnable — confirm chip number and board number before ordering
• ⚠️ Do not order based on spa model name or visual similarity alone

❓ Frequently Asked Questions

Q: How do I confirm this is the right board for my Cal Spa? A: Look on your existing circuit board for the white sticker. The chip number should show C2100R1(x) (R1A through R1E) or CS5000R1D. The Balboa 5-digit number should show 52299. Confirm both. If you need help identifying your board, contact Parts4Tubs with a photo of the chip sticker and your spa’s serial number.

Q: What does “M1 Super Duplex” and “XL Heater Only” mean? A: The “M1 Super Duplex” name refers to the Cal Spas/Balboa control system generation this board belongs to — the 2100 series system. “XL Heater Only” indicates this board is specifically configured for Cal Spas systems using the XL Heat Exchanger (F2550-0011, 5.5kW/240V), not a standard flow-through heater. Do not install this board in a system with a different heater type without consulting Parts4Tubs first.

Q: My old board had a C2000R2B chip — will this work? A: Yes, ELE09100205 can replace C2000R2A, C2000R2B, and C2000R2C boards. However, be aware that the default filter cycle will drop from 4 hours to 2 hours after the swap. You can manually adjust the filter cycle back to 4 hours through the topside control panel.

Q: Do I need to change anything on the new board before installing it? A: Yes — check the light jumper (located to the right of the glass fuse) and confirm it is set to the correct position for your spa’s lighting: 12V for a standard single spa light, or 120V for fiber optic lighting. Copy any other DIP switch and jumper settings from your old board.

Q: What sensor does this board use? A: Balboa Sensor Assembly 30337 (BAL30337). This is the standard temp/hi-limit sensor for Cal Spas 2100/CS5000 era systems. If your existing sensors are worn, order the 30337 separately.

Q: Which topside panel is compatible? A: The Cal Spas topside panel ELE09200778 (54283-03) is the confirmed compatible replacement panel. It connects via an 8-pin phone-style plug with a 7ft cable. Note that the ELE09200778 displays an “SF” code instead of a Safety Suction indicator light.

Q: What heater is required? A: The Cal Spas XL Heat Exchanger, part number F2550-0011 (5.5kW/240V). This is a specific Cal Spas heater format that differs from the standard Balboa M7 flow-through heater. Confirm your existing heater matches before ordering the circuit board.

Q: What warranty is included? A: 30-day limited warranty from the date of purchase (Cal Spas policy). This board is non-returnable; exchanges are available under warranty only. Contact Parts4Tubs for full warranty terms.

🏆 Why Choose the Cal Spas M1 Super Duplex (ELE09100205)

✅ Genuine Cal Spas OEM board — Balboa-manufactured, factory-programmed for 2100 / CS5000 systems
✅ Broad chip coverage — C2100R1A through R1E, CS5000R1D, and C2000R2(x) replacement
✅ Field-selectable light voltage — 12V or 120V jumper for single bulb or fiber optic
✅ Compatible with the Cal Spas 30337 sensor assembly and ELE09200778 topside
✅ Compatible XL heater (F2550-0011) and pressure switch cable (21224) available at Parts4Tubs

🤝 Why Buy from Parts4Tubs

✅ Fast US shipping
✅ Expert technical advice from Cal Spas and Balboa specialists
✅ Chip and compatibility verification before ordering
✅ Competitive pricing
✅ Cal Spas XL Heat Exchanger (F2550-0011), sensor 30337, transformer BAL30274-2, and topside ELE09200778 available
✅ Non-returnable boards — Parts4Tubs helps confirm before you order

✨ Summary

The Cal Spas M1 Super Duplex circuit board (ELE09100205, Balboa PN 52299) is a genuine OEM replacement PCB manufactured by Balboa Water Group for the Cal Spas 2100 Series and CS5000 control systems. The board ships with chip CS5000R1D (or newer revision) and covers all C2100R1(x) and C2000R2(x) chip variants. It is designed exclusively for Cal Spas systems using the XL Heat Exchanger (F2550-0011, 5.5kW/240V). The board features an 8-pin phone-style topside connector, a field-selectable light jumper (12V for single bulb, 120V for fiber optic), and is compatible with the BAL30337 sensor assembly and ELE09200778 topside panel. When replacing C2000R2(x) boards, the default filter cycle drops from 4 hours to 2 hours — adjust via the topside panel after installation. Identify by chip number (C2100R1(x) or CS5000R1D) and board number 52299. Non-returnable, with a 30-day Cal Spas 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.