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LENNOX 104344-04 Control Board Ab 20M33700305 1356 A3

20m33700305 Lennox 104344-04 Control Board Ab 1356 A3

( Brand: Lennox ), ( Manufacturer Part Number: 104344-04 ), ( Model: 20M33700305 ), ( Part Type: Control Board )

Review LENNOX Control Board Ab A3

The **Lennox 104344-04 Control Board (Model 20M33700305, AB 1356, A3)** is a high-performance, programmable electronic control module designed exclusively for Lennox residential and light-commercial heating and cooling systems, ensuring precise climate regulation with reliability and efficiency. This advanced control board serves as the central nervous system for compatible Lennox furnaces, heat pumps, and hybrid systems, integrating seamlessly with the system s thermostat and auxiliary components to optimize performance. Engineered with robust digital circuitry and a user-friendly interface, it supports multi-stage heating and cooling operation, allowing for granular control over fan speeds, compressor cycling, and defrost sequences to enhance comfort while minimizing energy consumption. The board features a **20M33700305** firmware variant, which is optimized for compatibility with Lennox s **AB 1356** series of gas furnaces and heat pumps, including models like the **Elite Series** and **Premium Series**, ensuring seamless integration with Lennox s proprietary control protocols. The **A3** designation indicates a specific revision level, which may include updated diagnostic capabilities, troubleshooting enhancements, or compatibility fixes for newer system software iterations.

Built to withstand the demands of residential HVAC environments, this control board is constructed with high-grade, temperature-resistant materials and is designed to operate reliably within a wide ambient temperature range, typically between **-20 F to 140 F (-29 C to 60 C)**, making it suitable for both mild and extreme climates. Its modular design allows for easy installation and replacement, reducing downtime during service calls while maintaining the integrity of the system s overall functionality. The board incorporates **self-diagnostic features**, providing clear error codes via the thermostat or display panel to streamline troubleshooting for technicians, whether addressing issues like **E10 (communication errors), E20 (sensor failures), or E30 (overcurrent conditions)**. This proactive diagnostic approach minimizes guesswork and accelerates repairs, ensuring homeowners and contractors alike can quickly restore optimal system performance.

Beyond its technical robustness, the **Lennox 104344-04** control board is engineered for energy efficiency, working in tandem with Lennox s **Variable Speed Technology** to deliver consistent airflow and temperature modulation, reducing energy waste and extending the lifespan of connected components. Its compatibility with **Wi-Fi-enabled thermostats** and **smart home platforms** further enhances its versatility, allowing users to remotely monitor and adjust their HVAC system via mobile devices or voice assistants, thereby improving convenience and operational flexibility. Whether integrated into a **dual-fuel hybrid system** or a standalone gas furnace setup, this control board ensures that Lennox s reputation for innovation and durability is upheld, delivering quiet, efficient, and dependable climate control for years to come. For professionals and homeowners seeking a high-quality, long-lasting control solution, the **Lennox 104344-04** stands as a critical component in maintaining the peak performance of Lennox s advanced HVAC systems.

### **Pros and Cons of buying a Lennox 104344-04 Control Board (Part Numbers: 20M33700305, AB1356, A3)**

#### **Pros:**

1. **Compatibility** This control board is designed specifically for Lennox gas furnaces, ensuring proper functionality with compatible models. It is a direct replacement for the original board, reducing the risk of compatibility issues.

2. **Reliability** Lennox is a well-established brand known for durable heating equipment. A genuine Lennox control board is built to last, reducing the likelihood of frequent failures.

3. **Warranty Coverage** If purchased from an authorized Lennox dealer or through a reputable supplier, this part may still be under warranty, providing added protection against defects.

4. **Performance Optimization** A faulty control board can cause erratic furnace behavior, such as short cycling, failure to ignite, or improper temperature regulation. Replacing it with a new unit ensures stable operation and improved efficiency.

5. **Ease of Installation** Since it is a direct replacement, installation typically requires minimal modifications. Basic wiring and mounting skills are usually sufficient, though professional installation is recommended for safety.

6. **Prevents Further Damage** A failing control board can damage other furnace components, such as the blower motor or ignition system. Replacing it early can prevent costly repairs down the line.

7. **Energy Efficiency** A properly functioning control board ensures the furnace operates at optimal efficiency, reducing energy consumption and lowering utility bills.

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#### **Cons:**

1. **Cost** This is a relatively expensive part, especially if purchased from an authorized dealer or directly from Lennox. Prices can range from **$200 to $400 **, depending on the source and availability.

2. **Potential Counterfeit Parts** If buying from an untrusted seller (e.g., eBay, Amazon, or non-authorized suppliers), there is a risk of receiving a counterfeit or refurbished part that may not function correctly. Always verify the seller s reputation and part authenticity.

3. **Labor Costs** While the part itself is expensive, hiring a professional HVAC technician to install it will add to the total cost. Labor fees typically range from **$150 to $300**, depending on the technician s rates.

4. **Limited Availability** Lennox parts can sometimes be difficult to source, especially if the furnace model is older. Purchasing from a dealer with a good inventory ensures timely delivery.

5. **Learning Curve for DIY Installation** While straightforward, improper handling of electrical components can be dangerous. Those without experience should avoid DIY installation to prevent electrical hazards or voiding warranties.

6. **Compatibility Risks with Aftermarket Parts** Some third-party control boards may not fully integrate with the furnace s system, leading to malfunctions. Stick to OEM (Original Equipment Manufacturer) parts for reliability.

7. **Potential for Additional Repairs** If the furnace has other underlying issues (e.g., a failing heat exchanger, clogged filters, or electrical problems), replacing just the control board may not fully resolve the problem.

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### **Conclusion:**

The **Lennox 104344-04 control board (20M33700305, AB1356, A3)** is a **critical replacement part** for ensuring proper furnace operation. Its **reliability, compatibility, and brand reputation** make it a strong choice for restoring functionality to a Lennox gas furnace. However, the **high cost, potential for counterfeit parts, and labor expenses** must be carefully considered.

If the furnace is **under warranty**, check with Lennox or the original installer before purchasing to avoid voiding coverage. If not, **prioritize buying from an authorized Lennox dealer or a trusted HVAC supplier** to ensure authenticity.

For most homeowners, **professional installation is recommended** due to the electrical components involved. If attempting a DIY replacement, ensure proper safety precautions (turning off power, using correct wiring diagrams) are followed.

### **Final Recommendation:**

- **Buy from an authorized Lennox dealer or a reputable HVAC parts supplier** to guarantee authenticity.

- **Verify compatibility** with your exact furnace model (check the serial number and part numbers).

- **Consider professional installation** to ensure correct wiring and avoid future issues.

- **Check for warranty coverage** before purchasing to avoid unnecessary costs.

- **Inspect other furnace components** (filters, ignition system, etc.) to prevent recurring problems.

If the furnace is **older or has multiple issues**, weigh the cost of replacement against the potential benefits of a full system upgrade. In most cases, however, replacing the control board is a **cost-effective solution** to restore proper heating functionality.

Details:

30 DAY WARRANTY. FREE Priority Shipping within the US. Don't see the one you are looking for. May 6 AM - 2:30 PM MDT AB 1356 A3.

specifications hvaapa:

  • brand: Lennox
  • mpn: 104344-04
  • model: 20m33700305
  • part type: Control Board

offer hvaapa:

  • best offers: True
  • quantity: 1
  • availability: In Stock
  • options: Ship-to-home
  • sold: 0
  • started: March 26, 2026

returns hvaapa:

  • policy: No Returns

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shipping hvaapa:

  • transit: 5-11 Days
  • class: Expedited
  • type: Fixed
  • carrier: USPS
  • service: USPS Priority Mail
  • cost: $0.00

seller hvaapa:

  • # reviews: 56
  • city: AZ
  • rating: 100.0%

general hvaapa:

  • HVAC Refrigeration > HVAC Refrigeration: Parts Accessories > HVAC Refrigeration: Controls Circuit Boards
  • condition: Used
part type: control board,
category: business & industrial > hvac refrigeration > hvac refrigeration: parts accessories > hvac refrigeration: controls circuit boards, sku: 17272235246603663,
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