🔌 Balboa EL2001 Mach 3 Spa Circuit Board — G1223 (53974-05) — Multi-Pump 240V ML-Series Control System

Trusted circuit board replacement for reliable EL2001 Mach 3 spa control and performance.

⚠️ IMPORTANT — PLEASE READ BEFORE ORDERING

• This board does NOT control audio or video devices. If your spa has a stereo system connected through the control pack, this board will not operate it.
• Identify your board by chip number before ordering. The EL2001 Mach 3 board carries chip numbers in the EL2001M3R2 series (e.g., EL2001M3R2C, EL2001M3R2E). Do not order based on appearance alone.
• Replacing a Mach 2.1 board? You will need to move the circuit board standoffs inside the control enclosure — standoff positions differ between Mach 2.1 and Mach 3.
• Circuit boards are non-returnable. Contact Parts4Tubs to confirm your chip number and compatibility before placing your order.
• Not for use in a metal enclosure box. Designed for Balboa plastic spa pack enclosures only.
• Newer board revisions include a Plug’n’click heater adapter (PN 25696). When installing on a spa with an older screw-terminal heater connection, adapter PN 25263 is required and the copper heater strap must be removed.

📋 Product Overview

The Balboa EL2001 Mach 3 circuit board (OEM Part Number 53974-05, Current MPN G1223, Chip EL2001M3R2E) is a genuine Balboa Water Group OEM PCB for the EL2001 ML-series control system. It is the Mach 3 generation of the EL2001 platform and is built on the same PCB hardware (22896 Rev B) as the EL2000 Mach 3 — with one key factory configuration difference: the W15 jumper wire is positioned at J98, enabling the X-B expander board configuration for blower operation with a two-speed Pump 2.

The EL2001 Mach 3 board controls a two-speed primary pump, a second pump (1-speed or 2-speed), a dedicated circulation pump, blower, ozone generator, and spa lighting — all configured through dual DIP switchbanks (A and B). It is compatible with Balboa ML700 and ML900 digital topside panels. Optional expander boards (X-B, X-P, X-P632, X-P231) allow additional pump and equipment outputs.

The EL2001 has been used across a wide range of hot tub brands including Master Spas and Bullfrog Spas. This board replaces all earlier EL2001 Mach 1, Mach 2, and Mach 2.1 circuit boards (subject to standoff position verification when replacing Mach 2.1 boards).

💫 Key Features

✅ Genuine Balboa Water Group OEM PCB — current-production G1223, Chip EL2001M3R2E, PCB PN 22896 Rev B
✅ EL2001 Mach 3 Generation — replaces all earlier EL2001 Mach 1, Mach 2, and Mach 2.1 boards
✅ Two-Speed Pump 1 Control — 240V main jet pump, high and low speed
✅ Pump 2 Output — 240V, configurable 1-speed (default/YCAH) or 2-speed via DIP switch B1/B2
✅ Blower Output — 240V, 1-speed, enabled via DIP B3; when Pump 2 is 2-speed, requires X-B expander (PN 53310) with W15 at J98
✅ Circulation Pump Output — 240V, separate relay, with four programmable filtration modes (A9/A10)
✅ Ozone Generator Output — 120V or 240V field-selectable via W13 wire at J9
✅ Spa Light Output — 12V or 120V selectable via J37 jumper and W9 wire
✅ 5.5kW Heater Support — 240V flow-through heater at full output
✅ Expander Board Support — X-B, X-P, X-P632, X-P231 for additional pump and equipment outputs
✅ Dual DIP Switchbanks — Switchbank A (12 positions) and Switchbank B (6 positions) for full configuration
✅ Persistent Memory (A12) — stores all user preferences, filter settings, and set temperature without a battery
✅ Real Time Clock (RTC) Support — J91 jumper enables/disables time-keeping for time-capable ML panels
✅ Dolphin Remote Compatible — Full-Feature and Spa-Only Dolphin Remote module support (J20)
✅ M7 Technology — no pressure switch or external sensors required; sensors integrated into heater assembly
✅ 1-Year Manufacturer Warranty — backed by Balboa Water Group
✅ Made in the USA — Balboa Instruments, Inc.

⚠️ AV/Stereo NOT supported — this board does not control audio or video devices.

🔧 Technical Specifications

Specification	Value
Current Balboa MPN	G1223
OEM Part Number	53974-05
Previous Part Number Revisions	53974, 53974-01, 53974-02, 53974-03, 53974-04
Chip Number (current)	EL2001M3R2E
Chip Numbers Also Replaced	EL2001M3R2A, EL2001M3R2B, EL2001M3R2C, EL2001M3R2D, HS2000R2B, MS5000R1A, SPAE15R1A, BF05R2A, MQKUR2E
PCB Part Number	22896 Rev B
System PN	53882-05
System Model	E2P-EL2001M3-YCAH
Software Version	32
Board Model	EL2001 Mach 3 (M3)
Key Factory Difference vs EL2000	W15 jumper at J98 (EL2001) vs EL2000 configuration — enables X-B blower expander with 2-speed P2
Input Voltage	240VAC / 60Hz
Service Required	48A, Class A GFCI-protected, 4-wire (Hot, Hot, Neutral, Ground)
Max Breaker Rating	60A
Heater Output	5.5kW @ 240VAC
Pump 1 Output	240V, 2-Speed
Pump 2 Output	240V, 1-Speed default (YCAH); configurable 2-Speed via DIP B1/B2
Blower Output	240V, 1-Speed; with 2-speed P2, X-B expander (PN 53310) required
Circ Pump Output	240V, 1-Speed, separate relay (DIP A9/A10)
Ozone Output	120V or 240V field-selectable at J9 via W13
Spa Light Output	12V or 120V selectable at J12 via J37 and W9
AV / Stereo Output	NOT SUPPORTED — this board does not control audio or video devices
DIP Switches	Switchbank A: 12 positions (A1–A12); Switchbank B: 6 positions (B1–B6)
Fuse (F5/F6)	Class G 30A (two fuses)
Fuse (logic)	0.3A 250V
Fuse (F10A)	10A 250V
Additional Fuse	3A 250V
TB1 Torque	27–30 in. lbs.
Wire Type	Copper conductors only
Enclosure	Plastic Balboa spa pack ONLY — NOT for metal enclosure
Heater Connection (new boards)	Plug’n’click — adapter PN 25263 required for older heater; copper strap removal required
Warranty	1 year (manufacturer)

ℹ️ Heater wattage note: 5.5kW at 240VAC. At 120VAC input the heater output is approximately 1/4 of the 240V rated wattage.

ℹ️ US Voltage Note: 240VAC/60Hz US residential service. Do not connect to 50Hz or CE-market power systems.

📋 Compatibility Guide

⚠️ CRITICAL — IDENTIFY BY CHIP NUMBER: The EL2001 Mach 3 chip family is EL2001M3R2x. Do not order based on board appearance — EL2000 and EL2001 boards look identical but have different software and factory jumper configurations.

Compatible Topside Panels (PDF + Horizon Confirmed):

Panel Part Number	Panel Name	Capability	J91 Jumper Setting
52684	ML400	Non-time capable	ON (both pins jumpered)
52649-01	ML700	Time capable	OFF (1 pin only)
52654-01	ML900	Time capable	OFF (1 pin only)

ℹ️ Horizon specifically confirms compatibility with ML700 (58-138-1050) and ML900 (58-138-1052).

Compatible Expander Boards:

Expander PN	Model	Function
53310	X-B	Blower output when P2 is 2-speed; W15 to J98 (factory default for EL2001)
53544	X-P	1-speed Pump 3 when P2 is 1-speed and Blower on J3; W15 to J97
53680	X-P632	2-speed Pump 3 or two 1-speed pumps; connects to Black AC
53681	X-P231	Branch circuit protection for high-amp devices; connects to Black AC
53426	X-O3	Dedicated ozone with X-FOW fiber optic kit (adapter PN 25338)
53933	X-Mount P	Mounting for expander boards in plastic enclosure

Replaces / Cross-Reference Part Numbers:

Part Number	Description
53974-05	This board — EL2001 Mach 3 (current)
53974, 53974-01 through 53974-04	Earlier revisions
G1223	Current Balboa MPN
53414	EL2001 earlier variant
53984	EL2001 variant
54492	EL2001 variant
55013-01	EL2001 variant
54278	EL2001 variant
54491	EL2001 variant
55022-01	EL2001 variant
55066-04	EL2001 control system
56002-04	EL2001 control system
33-53974-K	Hydroquip catalog number
53882-05	System PN using this PCB
600-6292 / 600-6298	OEM system variants
X801095	Master Spas OEM part
X300025	OEM variant
3-60-0097	OEM control system variant
3-70-0808	OEM control system variant
59-138-1022	Previous Horizon distributor PN for this board

🎛️ Board Functions & Controls

Pump Configuration:

Output	Connector	Voltage	Notes
Pump 1	J1 + W1	240V	2-Speed
Pump 2	J5 + W12	240V	1-Speed default (YCAH); B1 ON = 1-Speed, B1 OFF = 2-Speed
Blower	J3 + W2	240V	Via B3 ON; with 2-speed P2, X-B expander required (W15 at J98)
Circ Pump	J2 + W7	120V or 240V	Separate relay; modes via A9/A10
Pump 3	Via X-P or X-P632	240V	Requires expander board

EL2001 Factory Jumper Configuration (W15):

The EL2001 (53974-05) ships with W15 at J98 — this enables the X-B expander board configuration for blower operation when Pump 2 is 2-speed. This is the defining hardware difference from the EL2000 Mach 3 (53834-05), which ships with W15 in a different position.

Circ Pump Behavior (A9/A10 — PDF-CONFIRMED):

A9	A10	Circ Pump Mode
OFF	OFF	No Circ Pump
ON	OFF	24 Hours
OFF	ON	24 Hr with 3°F Shut-Off
ON	ON	Acts like Pump 1 Low (filter cycles, polls)

Heater & Sensor:

Feature	Specification
Heater Output	5.5kW @ 240VAC
Heater Connectors	HTR1 / HTR2
Hi-Limit Sensor	Sensor A (SENS. A)
Temperature Sensor	Sensor B (SENS. B)
Pressure/Flow Input	VAC connector

Additional Outputs:

Output	Connector	Voltage	Notes
Ozone	J9 + W13	120V or 240V	W13: Red AC = 240V; White AC = 120V
Spa Light	J12 + W9 + J37	12V or 120V	J37 pins 1–2 = 120V; pins 2–3 = 12V; W9 must match
Fiber / Color Wheel	J12 or J2	—	Via B4 ON; X-FOW kit may be required
AV / Stereo	NOT SUPPORTED	—	This board does not control audio or video

DIP Switchbank A (A1–A12 — PDF-CONFIRMED):

Switch	OFF Position	ON Position
A1	Test Mode OFF (normal)	Test Mode ON — technician only
A2	Low Amp — heater disabled while any HS pump/blower runs	High Amp — heater runs with HS pump/blower
A3	Filter cycles by start/end times (time-capable panels)	Filter cycles by duration (non-time capable)
A4*	12-hour time display	24-hour time display
A5*	Temperature in Fahrenheit	Temperature in Celsius
A6	15-min timeout (2 hr for P1 Low)	30-min timeout (4 hr for P1 Low)
A7	No Cleanup Cycle	Cleanup Cycle — 30 min after use; P1 Low + Ozone run 1 hr
A8	No ozone suppression	Ozone suppressed 1 hr after pump/blower press
A9	See Circ Pump Table	See Circ Pump Table
A10	See Circ Pump Table	See Circ Pump Table
A11	Non-circ: Ozone with P1 Low; Circ: Ozone with circ pump (P1 2-speed)	Non-circ: Ozone in filter/cleanup only; Circ: Ozone with circ pump (P1 1-speed)
A12	Persistent Memory Retained (normal)	Persistent Memory RESET — use at power-up only

A4 and A5 are defaults applied only when A12 is ON at power-up

DIP Switchbank B (B1–B6 — PDF-CONFIRMED):

Switch	OFF Position	ON Position
B1	Pump 2: 2-Speed	Pump 2: 1-Speed
B2	Pump 2: Disabled	Pump 2: Enabled
B3	Blower: Disabled	Blower: Enabled
B4	Spa Light enabled	Fiber Optic and Color Wheel instead of Spa Light
B5	Pump 3: Disabled	Pump 3: Enabled (Jets 3 replaces Blower on Aux panel)
B6	Normal panel layout	Alternate panel layout (ML900 scrunching / ML550/700 Jets 3 replaces Blower)

Key Jumpers:

Jumper	Function
W15	EL2001-specific: factory set to J98 (X-B expander config). Compare to EL2000 which uses different W15 position.
J37	Spa Light: pins 1–2 = 120VAC; pins 2–3 = 12VAC. W9 must match.
J91	RTC: 1 pin = Enabled (time-capable panels); pins 1–2 jumpered = Disabled
J83 (CFG)	Logic jumper: NOT installed = DIP switches active; installed = configuration locked
W13	Ozone voltage: Red AC = 240V; White AC = 120V
W9	Spa Light voltage on second leg of J12; must match J37

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🛠️ Installation Requirements

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

Pre-Installation Checklist:

• [ ] Confirm chip number is in the EL2001M3R2x family
• [ ] If replacing a Mach 2.1 board — move standoffs inside enclosure to Mach 3 positions before installing
• [ ] Record all DIP switch settings (Switchbank A and B) on existing board before removal
• [ ] Record all jumper positions (J37, J91, W13, W9, W15)
• [ ] Disconnect all power at the GFCI breaker or disconnect box
• [ ] Photograph all wiring and connections before removal
• [ ] Allow capacitors to discharge — wait 5 minutes after power-off
• [ ] Confirm enclosure is plastic — not for metal boxes
• [ ] Check heater connection: if older screw-terminal, adapter PN 25263 required; remove copper strap

Electrical Requirements:

Requirement	Specification
Supply Voltage	240VAC / 60Hz
Service	48A, 4-wire (Hot, Hot, Neutral, Ground)
Circuit Breaker	60A maximum
GFCI Protection	Class A GFCI required — NEC Article 680
Ground & Bonding	Required — NEC Article 680
Dedicated Circuit	Required
Disconnect Box	Within line of sight of spa, at least 5 ft from spa walls (NEC)
Wire Type	Copper conductors ONLY
TB1 Torque	27–30 in. lbs.

Key Board Connectors:

Connector	Function
TB1	Main power (Hot/Black, Hot/Red, Neutral/White, Ground)
J1 + W1	Pump 1 (2-Speed)
J2 + W7	Circ Pump (separate relay)
J3 + W2	Blower (1-speed) or Pump 3
J5 + W12	Pump 2 (1- or 2-speed)
J9 + W13	Ozone (120V or 240V)
J12 + W9	Spa Light (12V or 120V)
J20	Dolphin Remote receiver
J37	Spa Light voltage selector
J70 / J71 / J72	Main topside panel
J83 (CFG)	Logic jumper
J91	Real Time Clock jumper
W15	EL2001 factory position: J98 (X-B expander config)
SENS. A / SENS. B	Hi-limit / temperature sensor inputs
VAC	Pressure/vacuum switch input
EXT. RLY	External relay
2SP PUMP 3	2-speed Pump 3 (via X-P632)
AUX. F	Aux freeze sensor

⚠️ Persistent Memory Reset (REQUIRED after any DIP switch or configuration change):

1. Power down the spa
2. Set A12 ON
3. Power up — wait until “GC” or “CG” appears on panel
4. Set A12 OFF (with non-conductive tool while powered, or power down first)
5. If powered down in step 4, power up again
6. Leave A12 OFF for all subsequent power-ups

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🛡️ Safety Warnings

• ⚠️ ALWAYS disconnect all power before any board work — shock hazard
• ⚠️ Licensed electrician installation required; NEC compliance mandatory
• ⚠️ Class A GFCI required per NEC Article 680
• ⚠️ Equipment grounding and bonding required per NEC Article 680
• ⚠️ Plastic enclosure ONLY — never use in a metal box
• ⚠️ Reset Persistent Memory (A12) after any DIP switch change or new board settings will not take effect
• ⚠️ J37 and W9 must be set to the same voltage for the spa light — mismatch causes incorrect voltage
• ⚠️ If replacing Mach 2.1: move enclosure standoffs BEFORE installing the Mach 3 board
• ⚠️ Newer board revisions use Plug’n’click heater connection — adapter PN 25263 needed for older heater; copper strap must be removed
• ⚠️ Circuit boards are non-returnable — verify chip number before ordering

🔍 Error Codes & Diagnostics

Power-Up Display Sequence:

Display	Meaning
Three-number SSID	Software Version — third number should match system version 32
“GC”	Heater supports 3–6kW range — normal for 240V EL2001 operation
“CG”	Heater in 1–3kW range
Priming mode indicator	Normal startup
CFE + switch/jumper numbers	Configuration Error — invalid DIP/jumper combination

Common EL-Series Error Messages:

Display	Meaning	Action
OH	Overheat	Allow to cool; check hi-limit sensor
FLO / FL	Flow error	Check pump, filter, sensor wiring
SN / SNA / SNB	Sensor failure	Check Sensor A/B connections
PS	Pressure switch fault	Check pressure switch wiring
CFE	Configuration Error	Correct DIP/jumper settings; A12 memory reset

🎯 Ideal Applications

Application	Suitability	Notes
♨️ EL2001 Mach 1 / Mach 2 systems	✅ Replacement	Verify chip is EL2001 series
♨️ EL2001 Mach 2.1 systems	✅ With standoff move	Must reposition standoffs in enclosure
♨️ Master Spas (chip MS5000R1A, PN X801095)	✅ Confirmed	OEM cross-reference confirmed
♨️ Bullfrog Spas (chip BF05R2A)	✅ Confirmed	Cross-reference confirmed
♨️ Hydroquip (33-53974-K)	✅ Confirmed	Same Balboa platform
♨️ ML700 / ML900 panel spas	✅ Primary compatible panels	Horizon-confirmed topside match

This board is NOT suitable for:

• Spas requiring AV/stereo control through the spa pack — this board does not support AV
• Metal enclosure installations
• Mach 2.1 boards installed without moving the enclosure standoffs

❓ Frequently Asked Questions

Q: How do I confirm this is the right board? A: Find the chip number label on your existing board (white sticker, center of board or on relay/transformer). If it reads EL2001M3R2x (e.g., EL2001M3R2C), this is your board. Contact Parts4Tubs for assistance.

Q: What is the difference between the EL2001 and EL2000? A: Both use the same physical PCB (22896 Rev B) and the same software version (32), but the EL2001 ships with W15 jumper at J98 — enabling the X-B expander configuration for blower with two-speed Pump 2. Additionally, the EL2001 does not support AV/stereo control in the YCAH configuration.

Q: I’m replacing a Mach 2.1 board. Will this fit? A: The Mach 3 board replaces the Mach 2.1 functionally, but you must move the circuit board standoffs inside the enclosure before installation — the standoff mounting positions differ between Mach 2.1 and Mach 3 boards.

Q: Can this board control a stereo/audio system? A: No. This board (53974-05, YCAH system configuration) does not control audio or video devices.

Q: Do I need to reset Persistent Memory after changing DIP switches? A: Yes — always. Set A12 ON at power-up, wait for the ready indicator, then set A12 OFF. Without this reset, your new DIP switch settings will not take effect.

Q: What heater does this board support? A: The tech sheet (YCAH) documents 5.5kW @ 240VAC. The board supports heaters in the 3–6kW range at 240V. At 120V, heater output is approximately 1/4 of the 240V rated wattage.

Q: Do I need a licensed electrician? A: Yes. NEC Article 680 and most local codes require a licensed electrician for all hot tub electrical work.

Q: Is this OEM or aftermarket? A: This is a genuine Balboa Water Group OEM board (G1223 / 53974-05).

Q: What warranty is included? A: 1-year manufacturer warranty. Contact Parts4Tubs for full terms.

📥 Downloads & Resources

📄 Balboa EL2001 Mach 3 Hot Sheet 56002-02 — Official PDF — System outputs, expander options, ozone and light wiring for YCAJ system variant

⭐ Why Choose the Balboa EL2001 Mach 3 PCB (G1223)

✅ Genuine OEM Balboa board — G1223 matching original EL2001 Mach 3 hardware
✅ Replaces all earlier EL2001 generations — Mach 1, 2, and 2.1 all covered (standoff check required for 2.1)
✅ Multi-pump capability — P1, P2, Blower, Circ Pump plus expander boards for additional pumps
✅ M7 Technology — no pressure switch needed; sensors in heater assembly
✅ Master Spas and Bullfrog compatibility confirmed — covers a range of popular spa brands
✅ Non-returnable policy — Parts4Tubs verifies chip compatibility BEFORE you order
✅ 1-year manufacturer warranty — Balboa Water Group factory coverage

🤝 Why Buy from Parts4Tubs

✅ Fast US shipping
✅ Expert technical advice from spa specialists
✅ Competitive pricing
✅ Full warranty support
✅ Compatible ML-series panels, expander boards, and heater adapter cables available
✅ Pre-order chip number verification — confirm fit before you buy

🔌 Summary

The Balboa EL2001 Mach 3 PCB (G1223 / 53974-05, Chip EL2001M3R2E) is a genuine OEM replacement for EL2001 ML-series spa systems. Running on 240V/60Hz with a 5.5kW heater, it controls a two-speed Pump 1, second pump, blower, circulation pump, ozone, and spa lighting through dual DIP switchbanks. It does not support AV/stereo. Replacing a Mach 2.1 board requires moving the enclosure standoffs. Compatible with ML700 and ML900 topsides and used across multiple spa brands including Master Spas and Bullfrog. Circuit boards are non-returnable — verify chip number and confirm Mach 3 standoff positions before ordering, and remember any DIP switch change requires a Persistent Memory reset (A12).

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.