Control Board for MRCOOL A‑18‑HP‑WMAH‑230B 18k BTU Ductless Mini Split Wall‑Mounted Air Handler – Part # 17222000028516 – Fast USA Shipping from MRCOOL DIY Direct
Control Board for MRCOOL A‑18‑HP‑WMAH‑230B 18k BTU Ductless Mini Split Wall‑Mounted Air Handler – Part # 17222000028516 – Fast USA Shipping from MRCOOL DIY Direct
Control Board for MRCOOL A‑18‑HP‑WMAH‑230B 18k BTU Ductless Mini Split Wall‑Mounted Air Handler – Part # 17222000028516 – Fast USA Shipping from MRCOOL DIY Direct
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Genuine OEM Replacement Parts

Control Board for MRCOOL A‑18‑HP‑WMAH‑230B 18k BTU Ductless Mini Split Wall‑Mounted Air Handler – Part # 17222000028516 – Fast USA Shipping from MRCOOL DIY Direct

Brand MRCOOL DIY Direct
MRCOOL® PART NUMBER 17222000028516
$183.34
$183.34 $208.26
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✓ Confirmed Fitment

Fits These MRCOOL® Models

  • A-18-HP-WMAH-230B

This part may fit other MRCOOL® models or generations. Always verify your model number before ordering.

!
Compatibility matters. Replacement parts are model-specific. Images may be stock photos, and small visual differences may exist between production batches. Verify your model number, serial number, and existing part before placing an order.
In Stock & Ready to Ship
3 available through our authorized parts inventory network

Not Sure This Is The Correct Part?

Send us your indoor unit model number, serial number, and photos of the existing part before ordering. This helps us verify compatibility and reduce the chance of ordering the wrong replacement part.

Email Fitment HelpCall (417) 291-9921

Upgrade or repair your MRCOOL ductless mini split with confidence! This genuine OEM control board is engineered for seamless compatibility and reliable performance in the A‑18‑HP‑WMAH‑230B 18,000 BTU wall‑mounted air handler, ensuring your system runs smoothly all year long.

🔧 Key Features & Benefits

  • Perfect Fit for A‑18‑HP‑WMAH‑230B: Precision‑engineered replacement board guarantees 100% compatibility with the 18k BTU MRCOOL wall‑mounted indoor unit.

  • Reliable System Control: Manages fan speeds, compressor cycling, temperature sensors, defrost cycles, and safety interlocks to maintain optimal comfort and efficiency.

  • OEM Quality Assurance: Manufactured to MRCOOL’s strict specifications—no generic substitutes—so you get the same high‑quality component originally installed by the factory.

  • Easy DIY Installation: Pre‑configured plug‑and‑play connectors and clear wiring harness labels minimize install time. Ideal for seasoned DIYers and professional HVAC technicians alike.

  • Diagnostics & Service Mode: Built‑in diagnostic LEDs help you quickly identify faults, speeding up troubleshooting and reducing downtime.

  • Durable Design: Protected circuit layout and corrosion‑resistant coatings ensure long life, even in high‑humidity environments.

⚙️ Technical Specifications

  • Part Number: 17222000028516

  • Voltage: 24 VAC control circuit

  • Operating Temperature Range: 32°F to 122°F (0°C to 50°C)

  • Dimensions: 5.5″ × 4.0″ × 1.5″ (approx.)

  • Connector Types: Standard MRCOOL 6‑pin and 8‑pin harness ports

  • Compliance: UL listed, CE certified

✅ Compatibility

  • Indoor Unit Model: A‑18‑HP‑WMAH‑230B (May Be Compatible With Other Models or Brands)

📦 What’s Included

  1. OEM Control Board (Part # 17222000028516)

Note: Images may be stock photos and are for illustrative purposes. Actual board may vary slightly in appearance but will be fully compatible.

🚚 Why Buy from MRCOOL DIY Direct?

  • USA’s Most Trusted HVAC Dealer: Over a decade of specializing in MRCOOL products and support.

  • Fast, Missouri‑Based Shipping: Most orders ship same‑day from our Joplin, MO warehouse.

  • Expert Technical Support: Reach our in‑house HVAC pros by phone or email for installation tips and troubleshooting.

  • Secure Checkout & Warranty: 100% satisfaction guarantee + 1‑year parts warranty backed by MRCOOL DIY Direct.

🛠️ Installation Tips

  1. Power Off: Always disconnect 24 VAC power before servicing.

  2. Document Wiring: Take photos of the existing board connections for reference.

  3. Seating & Grounding: Ensure board sits flush and grounding strap is secured to chassis.

  4. Test Run: After install, cycle system through heat/cool modes and monitor diagnostic LEDs for any error codes.

Don’t let a faulty control board compromise your comfort—order your genuine MRCOOL control board today and get back to reliable, energy‑efficient cooling and heating. Click “Add to Cart” now!

Confirmed Fitment

Known Compatible Models / Series
  • A-18-HP-WMAH-230B
Compatibility Notice This part may fit other MRCOOL® models and generations. Compatibility outside the listed models is not guaranteed without verification.

Part Details

Part CategoryIndoor Air Handler Electronics
Part TypeIndoor Control Board
BrandMRCOOL DIY Direct
MRCOOL® Part Number17222000028516
Also Known As
  • Indoor Control Board
  • Indoor PCB
  • Air Handler Control Board
  • Indoor Main Board
  • Circuit Board
  • Electronic Control Module

Common Symptoms

This replacement part may be needed if your system is experiencing any of the following issues:

  • Indoor unit not powering on
  • Display not functioning
  • Communication errors
  • Unresponsive controls
  • Random shutdowns
  • Error codes
  • Intermittent operation
  • Loss of remote communication

Installation Notes

This replacement part should be installed by a qualified technician or a capable installer familiar with mini split service procedures. Always disconnect power before servicing HVAC equipment.

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FAQMRCOOL DIY Direct

Frequently Asked Questions About HVAC & Mini Split Replacement Parts

Quick answers to common questions about sizing, installation, and choosing the right MRCOOL DIY system.

How Do I Know If This Replacement Part Fits My HVAC System?

The best way to verify compatibility is by checking the model number and serial number of your HVAC system before ordering. Many replacement parts can fit multiple models, generations, or product series, while others are designed for specific units only. Model numbers are typically found on the equipment data plate located on the indoor air handler, outdoor condenser, or inside the service panel. If you are unsure, contact our team with your model number and photos of the existing part for compatibility verification.

Where Can I Find My Mini Split Model Number?

Most mini split model numbers can be found on the manufacturer data label attached to the indoor air handler or outdoor condenser. The label typically includes the model number, serial number, electrical specifications, refrigerant type, and manufacturing information. Providing this information helps ensure you receive the correct replacement part for your system.

Are OEM HVAC Replacement Parts Better Than Aftermarket Parts?

OEM (Original Equipment Manufacturer) replacement parts are designed to meet the exact specifications of the original equipment. Using genuine OEM parts helps ensure proper fitment, reliable operation, and long-term system performance. Aftermarket parts may not always meet the same design standards, which can result in compatibility or performance issues.

Can HVAC Replacement Parts Fit Multiple Models or Generations?

Yes. Many HVAC replacement parts are used across multiple models, capacities, and generations of equipment. However, compatibility can vary based on manufacturing revisions, electrical requirements, control board versions, and system design changes. Always verify compatibility before ordering any replacement component.

What Are the Most Commonly Replaced Mini Split Parts?

Some of the most commonly replaced mini split components include blower motors, cross flow fans, control boards, temperature sensors, remote controls, fan bearings, drain pumps, louvers, and communication modules. Replacing worn or failed components can help restore proper heating, cooling, airflow, and system efficiency.

Can I Replace HVAC Parts Myself?

Some replacement parts can be installed by experienced homeowners, while others should be installed by a qualified HVAC technician. Electrical components, refrigerant-related parts, and advanced control systems may require specialized tools, training, or safety procedures. Always follow manufacturer instructions and local codes when servicing HVAC equipment.

What Can Cause A Mini Split To Stop Heating Or Cooling Properly?

Poor heating or cooling performance can be caused by several issues, including failed blower motors, damaged fan assemblies, faulty sensors, defective control boards, airflow restrictions, dirty filters, refrigerant issues, or communication errors between system components. Proper troubleshooting is recommended before replacing any part.

How Can I Verify The Correct Replacement Part Before Ordering?

To verify compatibility, gather your equipment model number, serial number, and clear photos of the existing component. This information allows our team to compare your system with manufacturer specifications and help identify the correct replacement part for your equipment.

Can Replacement HVAC Parts Be Returned?

Return eligibility varies depending on the type of part and its condition. Electrical components, control boards, special-order items, and installed parts may be subject to specific return restrictions. Please review the current return policy before ordering and contact us with any questions regarding part eligibility.

How Long Do Mini Split Components Typically Last?

The lifespan of HVAC components depends on operating conditions, maintenance, installation quality, and environmental factors. Many motors, fans, sensors, and electronic components can provide years of reliable service when properly maintained. Regular cleaning, inspection, and preventive maintenance can help extend the life of your HVAC system and its replacement parts.