
The Robertshaw/Lennox 18G89 Flame Sensor is an essential component in the safe and efficient operation of your gas furnace. This flame sensor is designed to detect the presence of a flame and send a signal to the furnace's control board to continue the gas flow. If the flame is not detected, the furnace will shut off for safety reasons.
The 18G89 Flame Sensor is made of a ceramic material with a sensing element coated in a material that glows red when a flame is present. The sensor is roughly the size of a thermocouple and is secured in place with two screws. The sensor has a resistance of approximately 100 ohms when a flame is present and infinite resistance when no flame is detected.
The sensor is designed to withstand high temperatures, making it ideal for use in gas furnaces. It is also designed to be self-diagnostic, meaning it can indicate to the control board if it is not functioning correctly. The sensor has three color-coded wires that connect to the furnace's control board: red, white, and green. The red wire is the power wire, the white wire is the signal wire, and the green wire is the ground wire.
Installing the 18G89 Flame Sensor is a relatively simple process, but it is crucial that it is installed correctly to ensure the safe and efficient operation of your furnace. If you are not confident in your ability to install the sensor yourself, it is recommended that you hire a professional HVAC technician to do it for you.
The Robertshaw/Lennox 18G89 Flame Sensor is a high-quality, reliable component that is essential for the safe and efficient operation of your gas furnace. With its self-diagnostic capabilities and ability to withstand high temperatures, you can trust that this sensor will provide you with peace of mind and reliable performance for years to come.
Pros and Cons of Buying a Robertshaw/Lennox 18G89 Flame Sensor for Your Furnace
The Robertshaw/Lennox 18G89 flame sensor is a critical component in maintaining the safe and efficient operation of your furnace. Replacing a faulty flame sensor with a new one can help prevent potential issues. In this analysis, we will discuss the advantages and disadvantages of purchasing a Robertshaw/Lennox 18G89 flame sensor.
Pros:1. Enhanced safety: A faulty flame sensor can result in the furnace continuing to operate without a proper ignition, potentially leading to carbon monoxide leaks or other hazardous situations. By replacing the sensor, you ensure the safety of your home and family.
2. Improved furnace performance: A new flame sensor helps maintain proper ignition, ensuring the furnace functions at its best. This results in consistent heating, energy savings, and a more comfortable living environment.
3. Cost-effective: Replacing a faulty flame sensor is generally more cost-effective than purchasing a new furnace. The price of a single flame sensor is relatively low compared to the expense of a new heating system.
4. Easy to install: Installing a new flame sensor is a straightforward process, usually only requiring a few tools and minimal technical expertise.
Cons:1. Potential for false positives: Sometimes, a new flame sensor may incorrectly detect the absence of a flame, causing the furnace to shut off. This can be resolved by cleaning the sensor or adjusting the furnace settings.
2. Short lifespan: Flame sensors typically have a lifespan of around 1,000 to 5,000 hours of operation. This means they may need to be replaced more frequently than other furnace components.
3. Limited availability: Some homeowners may have difficulty finding a replacement flame sensor locally, potentially requiring an online purchase or a special order from a HVAC supplier.
Conclusion:While there are some disadvantages to purchasing a Robertshaw/Lennox 18G89 flame sensor, the benefits far outweigh the drawbacks. The enhanced safety, improved furnace performance, cost-effectiveness, and ease of installation make it a worthwhile investment for any homeowner with a faulty flame sensor.
Recommendation:If you suspect that your furnace's flame sensor needs replacement, consider purchasing a new Robertshaw/Lennox 18G89 flame sensor. The pros outweigh the cons, and the investment will ensure the safe and efficient operation of your furnace. You can purchase the sensor from a trusted HVAC supplier or online retailer. Remember to follow the installation instructions carefully to ensure proper functioning.
Details:
Note: actual colors of the item may be slightly different from photos due to camera, lighting's, and monitors.
specifications maxohvac:
- brand: Robertshaw/lennox
- mpn: 18g89
- battery included: No
- depth: 1.000
- type: Hvac Parts Heating And Cooling Parts
- features: Flame Sensor, Compatible With Brand Lennox, Product Type Flame Se
- country of origin: Mx
returns maxohvac:
- paid by: seller
- time: 30 days
- method: money back
- policy: returns accepted
seller maxohvac:
- # reviews: 4219
- city: heber springs, arkansas
- rating: 100.0%
payments maxohvac:
- credit card: mastercard
- other
- wallet: apple-pay
offer maxohvac:
- availability: in stock
- in stock #: 5
- sold #: 6
- options: ship-to-home
- started: march 24, 2026
- prices: $5.00–$350.00
- item condition:
- New
- New – Open box
- Used
- Open box
- Unspecified
general maxohvac:
- category: Business & Industrial > Hvac Refrigeration
shipping maxohvac:
- carrier: usps
- class: standard
- type: calculated
- transit: 3-8 days
- service: usps ground advantage
Also Viewed:
- 10-681: FURNACE SENSOR CARRIER, Robertshaw
- 100-0031-01: CONTROL, Robershaw
- 7C1-C6F-019: VALVE, Lennox
- 780-715U: FURNACE HVAC CONTROL BOARD, Lennox Robertshaw