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MrCool Smart HVAC Controller Enhanced WiFi Kit for Ductless Split System PN: WMK-19

Brand WiFi Controller
MRCOOL® PART NUMBER WMK-19
Regular price $64.89
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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.
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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.

MrCool WMK-19 Smart HVAC Controller — Enhanced WiFi Kit | Works with Alexa & Google

Take total control of your MrCool ductless mini-split heat pump with the MrCool WMK-19 Smart HVAC Controller (Enhanced WiFi Kit). From anywhere in the world, adjust modes, set temperatures, and manage schedules right from your smartphone for a comfortable, energy-efficient home—whether you’re at work, traveling, or relaxing on the couch.

Seamlessly integrates with Alexa, Google Assistant, the SmartHVAC app, and the MrCool app for simple voice and mobile control. Perfect for DIYers and smart-home enthusiasts, WMK-19 adds powerful automation and insights to your MrCool system.

Key Features

  • Global Control: Full mini-split access from anywhere with internet.
  • Weekly Scheduling: Program temps by day/time for comfort & savings.
  • Filter Maintenance Reminders: Stay on top of filter care for efficiency.
  • Geo-Fencing: Auto-adjusts based on your proximity to save energy.
  • Zone Control: Manage multiple indoor units from a single interface.
  • Usage Statistics: Track consumption trends to optimize settings.
  • Action Timeline: Review recent commands for smarter fine-tuning.
  • Smart-Home Ready: Works with Alexa, Google Assistant, SmartHVAC app, and MrCool app.

Technical Specifications

  • Model: WMK-19 (Smart HVAC Controller, Enhanced WiFi)
  • Compatibility: MrCool ductless mini-split air conditioners & heat pumps*
  • Apps: MrCool app & SmartHVAC app (iOS/Android)
  • Voice Assistants: Amazon Alexa & Google Assistant
  • Connectivity: Wi-Fi (2.4 GHz)
  • Control Modes: Cool, Heat, Dry, Fan, Auto (model-dependent)
  • Scheduling: 7-day / weekly program
  • In the Box: WMK-19 controller, communication cable (if applicable), setup guide

*Check your indoor unit model for WMK-19 compatibility before purchase.

💡 Pro Tip: Most MrCool ductless mini-split air handlers already include the WMK-19 Smart Controller in the box. It’s a true plug-and-play WiFi adapter—just connect it to your indoor unit to enable app-based control through the MrCool or SmartHVAC app. No additional wiring or setup tools are required—simply plug it in and pair it to your network for instant smart-home integration.
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Confirmed Fitment

No confirmed fitment models have been added yet. Verify compatibility before ordering.

Part Details

BrandWiFi Controller
MRCOOL® Part NumberWMK-19

Common Symptoms

No common symptom information has been added for this part type yet.

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.

No Q&A content has been added for this replacement part yet.

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.