Comprehensive Cross-Reference Guide: Mini Split Inverter Control Board Compatibility and Interchangeability

Introduction
Mini split ductless air conditioning systems have risen to prominence for their flexibility, energy efficiency, and ease of installation, but with this expanded adoption comes significant complexity in servicing and repairs, especially at the circuit board level. The inverter control board (PCB) is the "brain" of the modern mini split system, governing fan speeds, compressor modulation, temperature regulation, error diagnostics, and smart features. However, the proliferation of brands, rebranding practices, and variable system firmware and connectors have made cross-referencing compatible control boards a substantial challenge for technicians, distributors, and end-users alike. Navigating these challenges is essential not only for timely repairs but also to reduce downtime, save on parts inventory costs, and avoid technical incompatibilities that could damage expensive compressors or void warranties.
This report provides a comprehensive, up-to-date cross-reference guide for mini split inverter control boards, with detailed brand/model-part compatibility, part numbers, universal board substitution options, and critical compatibility notes. It draws on a wide spectrum of web-based technical documentation, distributor inventories, manufacturer resources, and the latest service literature, with a robust focus on interoperability, limitations, and best practices. This analysis is paired with a printable markdown-format chart for direct reference in technical environments.

Overview of Mini Split Inverter Control Board Compatibility
An inverter control board in a mini split system acts as a sophisticated digital and power-control module. Its roles include sensing/interpreting room and coil temperatures, modulating the compressor speed via variable frequency drive (VFD), orchestrating indoor and outdoor fan speeds, and interpreting commands from remotes or smart home controllers. The interchangeability of these boards is not universal, but is often possible within product “families” or brands that share OEM roots (e.g., Midea and Carrier systems share PCB similarities due to shared manufacturing facilities).
Common Compatibility Factors
Crucial factors that determine cross-brand and cross-model compatibility include:
• Connector Types and Pinout: Boards must match in the configuration, number, and type of connectors to interface with compressors, sensors, motors, and communication wires. Non-matching connectors may result in incompatibility or require rewiring, which increases risk.
• Firmware and Logic: The embedded logic (often proprietary and model/brand-specific) must support sensor types, fault codes, and operational protocols. Flashing a mismatched firmware, or using a PCB with incompatible logic, may result in unreliable operation or component damage.
• Voltage and Power Ratings: Control and drive circuits must match in voltage, current capacity, and phase for both safety and performance.
• Sensor Types: Thermistors, hall sensors on fan motors, and pressure transducers vary. Firmware must “understand” sensor feedback.
• Compressor and Fan Motor Types: Early inverter systems may use AC motors with externally switched relays, but modern systems employ DC brushless motors and require compatible driver circuits on the main board.
• Optional Features: Not all boards support features like WiFi, swing motor, or electronic expansion valves (EEV). Some may have additional terminals for wired thermostats or multi-zone logic.
Technicians and suppliers must consult comprehensive parts charts, wiring diagrams, and—when in doubt—obtain photographs of OEM parts to visually verify matches.
Universal and Aftermarket Boards
Enterprises like Everwell and others have introduced “universal” inverter control board kits (e.g., Everwell MCRC-002, CRC-001) that claim up to 99.99% compatibility with 220–240V, up to 18,000 BTU mini split systems, offering broad support for common AC and DC fan motors, DC inverters, and capacitor requirements. These boards serve as powerful stopgaps for older or less common brands where OEM PCBs are unavailable, but still require attention to wiring and sensor types, and occasionally replacing indoor fan motors if the original is not DC-compatible.

Daikin Inverter Control Boards: Part Numbers and Cross Reference
Daikin PCB Landscape
Daikin, as a global leader, offers an expansive model lineup and highly specialized OEM inverter PCBs and interface boards. Daikin’s policy strongly favors the use of model-specific replacement boards, often denoted as “P.C.B. Assy” with particular part numbers for each model and series.
Notable Daikin PCB Part Numbers & Replacement Practices
• RKS, FTK/FTXS Series: Common inverter PCBs include:
• EC0530 (e.g., for LMX, RXYMQ series)
• PC0409 series (e.g., VRV and RWEYQ-M systems)
• 4015735 (FAN) 2P383788-14 (FBA/FBQ)
• Main inverter PCB assemblies: 2P309361-2, PC1135-2 (VRV, RXYQ12P7Y1K)
• Residential Wall Mounts:
• PCB for CTXS12HVJU: indoor PCB with part # CTXS12HVJU
• FTK12AXVJU: indoor main PCB (FTK12AXVJU)
• IR Receiver: FTK12AXVJU IR receiver board
• VRV Multi-zone:
• PCB No. 5017869 (EC11091 for VRV City Multi)
• PCB ASSY EC15006-3 (G) 3P467789-1 for commercial outdoor units
• General Daikin PCB sourcing tips:
• Always confirm the exact model tag and revision due to frequent rolling changes in PCB design and firmware.
• Many boards are superseded; manufacturers or major Daikin distributors (Johnstone, Orion Air, Daikin Comfort Parts Finder) can provide current and replacement numbers.
Compatibility Notes
• Cross-Reference Caution: Even boards matching in shape and connector layout may have different logic or firmware; mismatches can cause failure in error reporting, sensor reading, or compressor control.
• Supplier Practices: Daikin boards are rarely shared cross-brand. They should only be interchanged with strictly verified cross-references from official Daikin documentation or distributor databases.
• Aftermarket/Universal Support: Aftermarket universal boards generally do not support Daikin due to proprietary communication and sensor logic differences.

Mitsubishi Inverter Control Boards: Part Numbers and Cross Reference
Mitsubishi PCB and PWB (Printed Wiring Board) Ecosystem
Mitsubishi Electric distinguishes itself with very specific PCB part numbers (commonly E or R series, e.g., E22P26451, R61015293), and categorizes by indoor/outdoor and controller devices. They firmly discourage use of third-party boards for warranty and safety purposes.
Key Mitsubishi PCB Models/Part Numbers

Compatibility Notes
• Mitsubishi Boards Are Highly Model-Specific: Physical fit does not imply logic/connector/sensor compatibility due to custom firmware and configuration memory chips (EEPROM).
• Cross-Brand Interchange Not Supported: Mitsubishi PCBs are rarely, if ever, used in other brands’ systems.
• Firmware Interlocks: EEPROM or data memory on Mitsubishi boards can “lock” the board to the model/serial (security/anti-tamper), especially in City Multi and multi-zone setups.
• Aftermarket/Universal Options: Universal inverter boards (e.g. Everwell) do not support Mitsubishi logic, sensor, or communication protocols.

Fujitsu Inverter Control Boards: Part Numbers and Cross Reference
Fujitsu PCB Structure and Part Numbering
Fujitsu splits its inverter boards across indoor, outdoor (IPM—Inverter Power Module), and main PCB sets, each bearing detailed, model-specific numbers such as 9709681008, 9709682784, and 9709682777. Listings in official Fujitsu part shops (Johnstone, YouNits, Fujitsu General) often indicate obsolete numbers and their superseded equivalents for various models and years.
Example Fujitsu PCB Cross-Reference Table

Compatibility Notes
• Fujitsu is Model Locked: Like Mitsubishi, Fujitsu boards are tightly model-tied, but will often publish direct replacement numbers for superseded PCBs. This makes obtaining correct versions easier, provided the technician can provide the full model number.
• Parts Supplier Requirements: Photos and model tags are often requested prior to sale to ensure correct cross-reference due to the high risk of mismatch.
• Universal Board Support: Universal inverter boards are not compatible due to Fujitsu's proprietary communication and sensor protocols.

Midea Inverter Control Boards: Part Numbers and Cross Reference
OEM & Private Labeling Practices
Midea stands as one of the largest air conditioner OEMs, supplying not only under its own brand but also for Carrier, AirCon, Klimaire, Senville, Pioneer, Blueridge, and many more. Many Midea boards are cross-compatible across label brands, but careful model cross-checking and connector comparison is mandatory.
Example Midea Control Board Part Numbers

Compatibility Notes
• Connector and Voltage Matching: Even if the model numbers are similar, connector types and board revision may differ. Always compare the old board’s photos and consult with the parts supplier.
• Interchange with OEM-Label Brands: Many Midea boards (particularly for 9K, 12K, 18K, 24K BTU) are physically and electrically compatible with units sold as Air-Con, Klimaire, Cooper & Hunter, Senville, and others. When in doubt, obtain both model AND serial numbers for full cross-match.
• Aftermarket Boards: Universal inverter PCB kits (see below) typically list Midea and its “family” brands as compatible, if you check for proper sensor/fan motor match.

Gree Inverter Control Boards: Part Numbers and Cross Reference
Gree’s Multi-Brand Manufacturing
Gree supplies systems under its own name and for several white-label brands (e.g. Tosot, Cooper & Hunter, Blueridge, York, and occasionally Senville and MrCool units). As with Midea, this broadens the cross-compatibility pool.
Gree PCB Example Part Numbers

Compatibility Notes
• White-Label Support: Cross-matching with Tosot, Blueridge, and others is achievable with careful part number and connector verification.
• PCB Matching By Brand: Never rely solely on visual similarity without electrical pinout comparison.
• Universal Board Support: Everwell MCRC-002 and equivalent universal PCB kits claim Gree compatibility for standard single-zone 220–240V models with DC inverter and DC/AC fan support.

LG Inverter Control Boards: Part Numbers and Cross Reference
LG PCB Design and Service Notes
LG mini split inverter boards are tightly integrated and often cross-reference with certain OEM-models privately branded under Comfort Aire, York, and others. LG uses part numbers like EBR64173903 (power/inverter), EBR73093604, and EBR83796503 for inverter control functions.
LG PCB Examples Table

Compatibility Notes
• Strict Model Verification: LG boards share shapes across different capacities, but firmware and sensor/connection logic usually differ. Always extract specific part number and cross-check with supplier or LG service documentation.
• Aftermarket/Universal Fit: Universal kits are rarely recommended due to proprietary LG communication and safety lockouts.

Cooper & Hunter Inverter Control Boards: Part Numbers and Cross Reference
Overview
Cooper & Hunter (C&H) units are often manufactured by Midea or Gree, which facilitates some cross-brand compatibility for PCBs. The company and affiliated distributors offer substantial technical support and product documentation for proper part matching.
Common Cooper & Hunter (CH) PCB Numbers

Compatibility Notes
• Physical/Image Matching: C&H technical support often requests photos or direct model label information to confirm correct PCB publication, due to Midea/Gree model crossover and incremental changes between production runs.
• Manuals: Service and owner’s manuals are public, providing diagnostic flow and connector details for each model series, including error codes and sensor pinouts.
• Universal Boards: Universal PCB kits (e.g., Everwell MCRC-002) are compatible with many C&H systems up to 18k BTU, provided the board supports AC/DC fan logic and electronic expansion valve drive as required.

MrCool Inverter Control Boards: Part Numbers and Cross Reference
MrCool Brand Notes
MrCool sells both DIY and professionally-installed mini split lines. Their control boards are strictly model-specific, with numerous warnings against cross-model or cross-series substitution, even for units of the same capacity. This is because each series' board firmware supports distinct error codes, sensor sets, and—importantly—capacitor integration, which may be discrete or integrated in the PCB depending on the generation.
MrCool Example Part Numbers

Compatibility Notes
• No Cross-Series Interchange: Even across what appears to be similar units (12k/18k DIY vs. Olympus vs. Advantage), boards are not swappable due to different logic, connectors, capacitor integration, and software (smart app) support.
• Supplier Instructions: Always provide the exact model and serial when ordering, even boards that appear physically identical may have changed revision or feature set.
• Universal Boards: Universal PCB kits are not officially supported by MrCool. Use in non-DIY models is risky and will void the warranty.

Everwell Universal Inverter PCB Compatibility and Part Numbers
Everwell Universal PCB Kits
Everwell’s MCRC-002 Universal PC Board Kit is designed for repair scenarios where OEM boards are discontinued, not available, or cost-prohibitive. It’s an all-in-one solution claimed to fit nearly all ductless mini split units up to 18,000 BTU, 220–240V, and supports both AC and DC outdoor fan motors, DC indoor fans, and electronic expansion valve control.
Key Features
• Supports DC and AC fans
• Remote Control Included
• Compressor drive for most common mini split inverters
• Sensor support with broad temperature and mode coverage
• Complete replacement for indoor and outdoor inverter boards
Compatibility Notes
• Intended for single-zone mini splits up to 18k BTU with standard wiring and sensor arrangements. Highly versatile but not guaranteed for every obscure model. Not compatible with large multi-zone or premium “smart” multi-comm boards.
• Take note: If the original indoor fan motor is AC and the new board requires DC, replace the motor with a DC-compatible unit.
Installation Warnings
• Professional installation is required; incorrect capacitor or connector placement may cause board/COU damage.
• Ensure correct phasing (U, V, W) on compressor plug, proper sensor positioning, and correct dial (DC/AC) inverter board setting for control mode.
• Provides LED status for DC/AC detection, as a diagnostic

Aftermarket Universal Mini Split Control Boards (Everwell CRC-001, MCRC-002)
Board Overview
• MCRC-002: Universal inverter board for DC inverter systems (up to 18,000 BTU, 220–240V), includes indoor/outdoor PCBs, capacitor board, sensors, and remote.
• CRC-001: On/off universal board, less common for modern inverters.
• **Compatibility is highest in Midea-family, Gree-family, and other generic brands or white-labeled rebrands. Not compatible with major premium lines (Daikin, Mitsubishi, Fujitsu, LG, Carrier VRF, etc.).

Connector Types and Firmware Notes for Inverter Control Boards
Connector Types
• Power Connectors: Board-voltage input (AC 208–240V or 110–120V), with ground tabs.
• Compressor Output: Three-phase connections (U, V, W) for compressor; pinout must match VFD drive block.
• Sensor Plugs: JST or Molex types, often keyed, for:
• Room temp (NTC thermistor)
• Coil temp (pipe, discharge, or ambient coil sensor)
• Defrost sensors
• DC fan motors (Hall-effect feedback often required)
• Comm Wire: Signal/communication bus (usually low-voltage DC, e.g., 12–30V for remote/indoor-outdoor sync).
• EEV (Electronic Expansion Valve): Outlets for 5 or 6 wire stepper motors.
• Display/IR Receiver: For LED panels and/or remote receiver.
Physical connector mismatch is a top cause of “lookalike” boards failing to function. Always verify pin definitions with original and replacement PCB diagrams or datasheets.
Firmware and Logic Notes
• Newer boards contain pre-flashed microcontroller firmware. Incompatible firmware may ignore required safety cutoffs or fail to recognize sensor faults, leading to compressor/burnout or misdiagnosis.
• Some brands (Daikin, LG, Mitsubishi, Fujitsu) “lock” serial numbers in EEPROM, preventing even electrically compatible boards from working without model-specific programming.
• Universal boards boot with "standard" VFD logic, supporting commonly-available sensor banks and standard error codes, but may not provide proprietary advanced diagnostics.

Cross-Brand Compatibility Notes (Sensors, Fan Motors, Voltage)
Sensors
• Thermistors: Room temp, coil temp; resistance/temperature curves vary between brands. Use kit-included sensors if unsure.
• Fan motors: DC/AC. Board and motor must match logic and voltage. Universal kits often require replacing an AC indoor fan motor with a compliant DC version.
• Pressure sensors: More common on large, multi-zone, or high-end units—usually proprietary.
Voltage
• Single-zone mini splits: North America—predominantly 208–240V, European/Asian—220–240V, some smaller units at 110–120V.
• Incorrect voltage rating may cause immediate failure (burnt components).
• For universal boards, double-check supplied voltage matches original unit spec. Professional installation is mandatory.

Cross-Reference Table: Mini Split Inverter Control Boards
Below is a printable and editable markdown cross-reference table for major brands/models and compatible replacement or universal inverter boards, with key part numbers and essential compatibility notes.

Table Analysis
The above table enables quick matching of most major-brand mini split models with required inverter control board part numbers, highlighting where cross-brand or universal options are possible and—crucially—where substitution is not safe or supported. It is imperative to reference the outdoor and indoor model tags, provide photos where feasible, and, for multi-zone/large systems, consult manufacturer support, as cross-matching in those categories is exceedingly rare.

Detailed Explanatory Notes on Table Entries
Daikin: Every Daikin board must be matched by the full model and revision; cross-reference databases (like OrionAirSales, Johnstone Supply, Daikin Comfort) are the only reliable sources. Changing a PCB to another series or model—even if dimensionally identical—may disable communication, fan, or error logic, and risk expensive compressor damage.
Mitsubishi: Each inverter board is model, year, and zone-type specific (multi/single zone, ducted, wall). EEPROM and control memory may “lock” newly installed boards or prevent proper multi-zone operation. Always source boards from an authorized Mitsubishi distributor, using full model and board part#.
Fujitsu: Published cross-references make it easier to find superseded or improved board numbers, but never use a “similar” PCB without cross-verification. Sensor/connector/safety arrangements are not standardized across product generations.
Midea & Rebranded Units: The most “friendly” for board interchange, provided you stick to the Midea “family” (e.g., AirCon, Klimaire, Senville, Cooper & Hunter, Senville, Pioneer, Blueridge). If voltage, connector, and sensor logic match, a universal board like Everwell MCRC-002 will typically suffice. When in doubt, a visual inspection and consultation with your supplier are vital..
Gree & Affiliates: Gree-based models can often use universal PCB kits for replacement, as long as the installation manual’s wiring and sensor configuration are carefully checked.
MrCool: DO NOT mix DIY and non-DIY (Olympus/Advantage) PCB subassemblies, as each relies on unique logic and quick-connect/smart feature support.
Everwell MCRC-002: The universal “go-to” board for dead/inaccessible PCBs in generic/white-label/single zone units up to 18,000 BTU. Its value is highest when the OEM board is EOL or cost prohibitive, provided you perform proper motor and sensor matching.

Best Practices for Mini Split Board Cross-Referencing and Replacement
1. Always Obtain the Full Model Tag: Both outdoor and indoor unit model and serial numbers.
2. Photograph the Original Board (both sides): Share with the distributor or reference supplier’s online image libraries.
3. Compare Connectors Visually and Electrically: Use wiring diagrams or installation manuals (manufacturer support and sources like ManualsLib, or company/D-I-Y manuals).
4. Ask for Direct Cross-Reference: Review the manufacturer or distributor’s online cross lists before purchasing a “compatible” board.
5. For Universal Boards:
• Confirm voltage, sensor, and fan motor types.
• Replace non-DC fan motors with included compatible DC versions if required.
6. Install Only If Fully Confident: Professional installation is recommended to avoid mis-phasing, reversed connectors, or miswired sensors, which may cause component burnouts.
7. Test Board Before Full Assembly: Try all modes, check fan speed modulation, and monitor compressor and suction/discharge pressures on service instruments.

Limitations, Pitfalls, and Warnings
• NEVER Substitute a Control Board on Premium Brands (Daikin, Mitsubishi, Fujitsu, LG, Carrier VRF) with a Universal or Even Similar OEM Board Without Full Technical Verification.
• Error Codes and Sensor Protocols are Proprietary: A “functioning” control board that ignores high-pressure or low-temperature data may endanger the compressor, or cause catastrophic failure.
• Firmware Is Not Always Updatable: Many OEM boards use OTP (One-Time Programmable) flash memory; mismatched firmware often cannot be reflashed by the end user.
• “Lookalike” Boards May Differ Internally: Identical dimension and even connector layout can mask a different circuit layout or microcontroller inside.
• International vs. North American Models: Even the same brand/model number may differ in voltage, wiring, or firmware revision based on where it is sold (Europe, Asia, North America).
• For Multi-Zone and Advanced Controls: Never substitute outside of strict OEM guidelines.
• Warranty Risk: Any non-OEM board installation almost always voids warranty.

Conclusion: The Future of Mini Split Inverter Control Board Cross-Referencing
The increasing modularity and digitalization of mini split inverter boards has made them more efficient—but conversely, much more specialized. For generic, mainstream single-zone systems (~18k BTU, 220–240V) from Midea/Gree/OEM lines, universal replacement boards such as Everwell’s MCRC-002 have revolutionized field repair. However, for premium or proprietary brands, strict model-to-board matching remains the only safe and reliable path.
As mini split adoption continues to grow, service techs and facility managers must remain vigilant—consulting part numbers, double-checking connector and sensor matches, and noting the limits of even widely advertised “universal” solutions. It is equally critical to share accurate information—model tags, part numbers, serials, images—with suppliers before purchase. As universal and “smart” boards evolve, we can expect growing compatibility for mainstream systems, but high-end and multi-zone systems will likely remain closed to general interchange for the foreseeable future.
For fast reference, print or save the included compatibility chart, and when uncertainty arises, defer to OEM guidance over expedience.

This report integrates insights from a matrix of distributor inventories, OEM manufacturer listings, technical documentation, and universal board specification sheets to equip the HVAC professional or advanced DIYer with the deepest, latest knowledge for efficient, reliable, and safe inverter board replacement in mini split systems.

624762R Nordyne Inverter Board

624762R Nordyne Inverter BoardÂ

special order from factory Email colemanhvacparts@gmail.com