ARGUS 857MN10 Boiler Control Circuit Board Dunkirk 20125917 11RJ20 ARGUS850MN DKVLT-100

( Brand: Argus ), ( Manufacturer Part Number: 857MN10 ), ( Model: 20125917 ), ( Type: Burner Control ), ( Voltage: 110 V )

Review ARGUS Boiler Control Circuit Board Off Dunkirk

The **Argus 857MN10 11RJ20 Boiler Control Circuit Board**, designed for compatibility with the **Argus 850MN Dunkirk series** and the **DKVLT-100** control system, represents a sophisticated and high-performance component engineered for modern heating and domestic hot water applications. This precision-manufactured circuit board serves as the central nervous system of the boiler, orchestrating seamless operation, energy efficiency, and fault diagnostics with unparalleled reliability. Built to meet stringent industry standards, the board integrates advanced microcontroller technology and robust analog/digital signal processing to ensure optimal performance across a wide range of operating conditions. Its modular design allows for easy integration with the boiler s primary control unit, facilitating intuitive programming, user interface interactions, and real-time monitoring of critical parameters such as combustion efficiency, water temperature, and pressure levels. The **11RJ20** designation indicates a specific variant tailored for high-capacity heating systems, offering enhanced control over the boiler s ignition, modulation, and safety protocols, including overheat protection, flame failure detection, and pressure regulation. Compatible with the **DKVLT-100** display and control interface, this circuit board enables operators to access detailed diagnostics, adjust setpoints, and troubleshoot issues with minimal downtime. Constructed from high-grade, flame-retardant materials and featuring a durable PCB layout with reinforced solder joints, it is engineered to withstand the thermal and electrical stresses of continuous operation in demanding environments. Whether installed in residential, commercial, or industrial settings, this circuit board ensures precise temperature control, energy savings, and extended equipment lifespan, making it an indispensable component for maintaining peak performance in modern heating systems.

### **Pros and Cons of buying a Argus 857MN10 (11RJ20) Boiler Control Circuit Board (Compatible with Argus 850MN Dunkirk DKVLT-100)**

1. **Direct Compatibility** The circuit board is specifically designed for the Argus 857MN10 and is compatible with the Argus 850MN Dunkirk DKVLT-100 model, reducing the risk of functionality issues when installed.

2. **Reliability and Performance** Argus is a well-known brand in boiler control systems, and their components are generally built to last, provided they are of good quality. A properly functioning control board ensures stable boiler operation, reducing the likelihood of frequent breakdowns.

3. **Ease of Installation** Since it is a direct replacement part, installation should be straightforward for a qualified technician. The wiring and connections should align with the original board, minimizing the need for extensive modifications.

4. **Cost-Effective Long-Term Solution** Replacing a faulty control board is often more economical than repairing an irreparably damaged unit. It can extend the lifespan of the boiler, delaying the need for a full replacement.

5. **Accessibility of Parts** Argus components are relatively easy to source, especially for older models, due to their widespread use in commercial and residential heating systems.

6. **Potential Warranty Coverage** If the boiler is still under warranty (or if the control board itself has a warranty), this purchase could be fully or partially covered, reducing out-of-pocket expenses.

7. **Improved Safety** A malfunctioning control board can lead to unsafe operating conditions, such as improper gas flow or overheating. Replacing it ensures the boiler operates within safe parameters.

---

1. **Age and Obsolescence** The Argus 850MN Dunkirk series is an older model, and some components may be harder to find as demand declines. This could lead to longer wait times or higher costs if the board is discontinued.

2. **Quality Variability** Depending on the seller, the replacement board may be a refurbished, used, or counterfeit part. Low-quality boards can fail prematurely, leading to additional repairs or replacements.

3. **Technician Dependency** If the installation is not done correctly, it could cause further damage to the boiler or create electrical issues. A skilled technician is required to ensure proper diagnostics and installation.

4. **Cost of Replacement** While replacing a control board is cheaper than buying a new boiler, the part itself may still be expensive, especially if sourced from a reputable supplier. Labor costs for installation can also add up.

5. **Potential Software/Firmware Issues** Older control boards may lack updates or compatibility with newer diagnostic tools, making troubleshooting more difficult if problems arise post-installation.

6. **Risk of Incompatibility** Even if the board is labeled as compatible, slight variations in wiring or pinouts between models could cause issues. Thorough testing is required after installation.

7. **Environmental and Regulatory Concerns** If the boiler is outdated, it may not meet current energy efficiency or emissions standards. Replacing the control board alone won t improve efficiency considering a full upgrade may be necessary for compliance.

---

Buying the Argus 857MN10 (11RJ20) control circuit board for the Argus 850MN Dunkirk DKVLT-100 is a **practical and cost-effective solution** for restoring functionality to a failing boiler, provided the board is genuine and installed correctly. The direct compatibility and reliability of Argus components make it a strong choice for those who need a quick fix without a full boiler replacement.

However, the **age of the boiler model** and the **risk of sourcing low-quality or obsolete parts** are significant drawbacks. If the boiler is otherwise in poor condition or the control board fails repeatedly, it may be more economical in the long run to invest in a newer, more efficient model.

- **If the boiler is otherwise functional and the control board is the only failing component**, proceed with purchasing the **genuine Argus 857MN10 (11RJ20) board** from a trusted supplier (preferably the manufacturer or an authorized dealer). Verify the board s authenticity and ensure it matches the exact part number.

- **Hire a certified HVAC technician** to diagnose the issue first and confirm that the control board is indeed the problem. This prevents unnecessary expenses on the wrong part.

- **Consider the boiler s age and efficiency**. If the boiler is over 15-20 years old or has frequent issues, weigh the cost of repairs against the potential savings of upgrading to a modern, energy-efficient model.

- **Explore refurbished or remanufactured options** if purchasing new is prohibitively expensive, but be cautious of hidden defects.

- **Check for warranties or extended service plans** that may cover the replacement, reducing financial risk.

Ultimately, this replacement is **worth it for short-term reliability** but should be part of a broader assessment of the boiler s long-term viability.

Details:

Contact with questions, See pictures for details, Tested and works well, Came off of a Dunkirk on demand boiler model DKVLT-100 questions details well.

part #: 857mn10 price

• $159.99

specifications hvaapa:

• brand: Argus
• mpn: 857mn10
• model: 20125917
• type: Burner Control
• voltage: 110 V

seller hvaapa:

• rating: 100.0%
• # reviews: 310
• city: Canandaigua, New York

payments hvaapa:

• wallet: Apple-pay
• other
• money order
• credit card: Diners-club

returns hvaapa:

• time: 30 Days
• policy: Returns Accepted
• paid by: Buyer
• method: Money back

shipping hvaapa:

• class: Expedited
• carrier: USPS
• cost: $0.00
• transit: 3-9 Days
• type: Calculated
• service: USPS Priority Mail

general hvaapa:

• HVAC Refrigeration > HVAC Refrigeration: Parts Accessories > HVAC Refrigeration: Controls Circuit Boards
• condition: Used

offer hvaapa:

• sold: 0
• quantity: 1
• best offers: True
• started: February 2, 2026
• options: Ship-to-home
• availability: In Stock

Argus 857MN10 Is Similar To:

• Rheem Argus Ap14023-6 Argus794-r1 846mn10 7rh90 Boiler Control Board (43.1% similar) ARGUS794-R1 846MN10 7RH90 AP14023-6 boiler control board...(February 27th, 2026)