69W43 Furnace Flame Sensor - Exact ForLennox, Armstrong & Ducane Furnaces
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$11.99
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CONFIRM THIS PART FITS
Enter appliance or equipment model number to verify compatibility with this part
Replaces Part Numbers
69W43 Furnace Flame Sensor
Key Features
- Sensing rod detects flame presence for furnace operation
- Angled probe design
- Overall width: 4-5/8 in
- Features a 3/16 in male terminal for connection
- Durable construction for long service life
Replaces / Cross-Reference Part Numbers
- 69W43
- 69W4301
- LB-74940B
- LB74940B
- 102431-02
- 790-801A1
Compatibility & Fitment
- Direct replacement for specific furnace models from brands including:
- Armstrong
- Ducane
- Lennox
- Verify compatibility with your furnace model number prior to purchase.
When to Replace
- Furnace starts the ignition sequence but shuts off after a few seconds.
- Furnace control board indicates a flame sensor fault code.
- Visible carbon buildup, corrosion, or damage on the existing sensor rod.
- The ceramic insulator is cracked or broken.
Installation Tips
- Disconnect electrical power to the furnace unit before servicing.
- Avoid touching the metal rod with bare hands; handle by the ceramic base.
- Ensure the sensor is correctly positioned in the pilot or main burner flame.
- Confirm the mounting screw and wire are securely fastened.
-
WIDE COMPATIBILITY
Replaces Part Numbers 69W43, 69W4301, LB-74940B, LB74940B Compatible with specific Furnace of Lennox | Armstrong | Ducane -
FIX FURNACE'S SYMPTOMS
Short cycling | No heat or inconsistent heating | Delayed ignition | Error codes | Dirty flame sensor rod | Cracked ceramic insulator -
EFFECTIVE SOLUTION
Enjoy the great feeling when your furnace works properly like before - BlueStars brings DIY solutions to help you deal with any trouble -
IMPORTANT NOTE
This is a replacement part designed to be compatible with certain appliances. Any brand names mentioned are used solely to indicate compatibility.
LONG-LASTING SOLUTION
Made of high-grade wear-resistant Metal and Ceramics, ensuring durability and resilience against temperature changes
PRECISION FLAME DETECTION
Ensure home's safety by automatically shutting off the furnace whenever no flame is detected inside, preventing gas leaks
6 SIMPLE STEPS TO INSTALL
1. Turn off furnace power, close gas valve, and remove the front panel.
2. Disconnect the wire from the old sensor.
3. Unthread the mounting screw.
4. Slide the old sensor out.
5. Install the new one, secure it into place, and reconnect wire.
6. Reattach the panel, open gas valve and turn power back on.
2. Disconnect the wire from the old sensor.
3. Unthread the mounting screw.
4. Slide the old sensor out.
5. Install the new one, secure it into place, and reconnect wire.
6. Reattach the panel, open gas valve and turn power back on.
Compatible Models
Locate the model number of your appliance or equipment on the manufacturer's label and use it to check compatibility before ordering
Loading compatible models…
Probe Shape
90° angled probe; crook on end approx. 1.31"
Rod Diameter
0.114"
Overall Width / Length
4-11/16" (4.687")
Rod Material
High-temperature flame rod with alumina-ceramic insulator
Rod Max Temperature
2190°F
Ceramic Max Temperature
1000°F
Insulation Max Temperature
250°F
FAQs
Suggestions
Common Model Number Locations
Need help finding your model number? Select your appliance or lawn equipment below for location diagrams
- Above the refrigerant valves on the back of the air conditioner
- On the side of the unit near the run capacitor or electrical lines that go into your home
- On either side of the exterior
- On the back of the unit where the power cord is located
- In the cool air exhaust port
- To the left of the fan opening, on the weather barrier
- Below the control panel
- On either side of the exterior
- Behind the front grill on the frame
- On the door frame
- On the inside of the tub wall
- Behind the control panel
- On the door
- Inside the edge of the unit
- On the back exterior
- On the door
- On the side of hose storage
- Inside the edge of the unit
- On inside of the door
- On the door frame
- On the back exterior of the unit
- On the exterior side of the unit
- Behind the control panel
- On the inside of the door
- On the door frame
- On the exterior side of the unit
- At the top of the unit
- On the inside of the dryer door
- On the door frame
- Under the washer lid
- On either side of the exterior
- On the back exterior of the unit
- On the door frame
- On the exterior side of the unit
- On interior wall
- On the control panel
- On side of door
- On the right-hand side of the vent, under the control panel
- On the interior wall of the microwave (microwave model number only)
- On the door frame
- On the rear panel
- On the exterior back of the unit
- Inside the top part of the vent duct (in down-draft models)
- Underneath a burner
- Underneath a knob
- Underneath the cooktop (lift-up style)
- Bottom of cooktop
- On an exterior wall
- On an inside wall
- On the door frame
- On the right-hand side of the vent, under the control panel
- On the interior wall of the microwave (microwave model number only)
- On the door frame
- On the rear panel
- Behind the control panel
- Under the front surface unit
- On the door frame
- Interior side panel
- On the exterior of the unit
- On the inside of the lower storage compartment wall
- On top the hood
- Behind the filter
- Under the hood
- On the inside of the door
- On the exterior back of the unit
- Inside on the rear wall
- On the exterior side of the unit
- On door jamb
- On rear of frame
- Behind front panel
- On ceiling of refrigerator
- On interior wall
- On the inside of the door
- Behind crisper drawer
- Behind kickplate
- On ceiling of refrigerator
- On interior wall
- On door frame
- Behind crisper drawer
- Behind kickplate
- On ceiling of freezer
- On interior wall
- On the inside of the door
- Behind kickplate
- On the exterior side of the unit
- On inside of the door
- On the door frame
- On the back exterior of the unit
- On the front exterior of the unit
- On the control panel
- Inside the lid
- Under the lid on the frame
- On the exterior of the unit
- At the top of the unit
- On the inside of the dryer door
- On the door frame
- Under the washer lid
- On either side of the exterior
- On the top center of heater
- On the exterior of the unit
- On the starter housing
- On the side of the housing, behind the top handle
- On the side of the motor housing
- Near the rear grip
- On the top or sides of the engine housing
- On the gas tank
- On the recoil housing
- On the handle bars
- On top of the engine cover
- Near discharge chute, often behind chute flaps
- On rear of the deck, behind the engine
- Dash panel
- Back of mower/rear bumper
- Underside of the seat
- Lower side of hood, near engine
- Frame (beneath the seat, footrest)
- Mower deck
- Underside of the seat
- Frame beneath or near the seat
- Back of mower/rear bumper
- Lower left side between gas tank and mower deck
- Under the foot plate
- On the rear of the blower
- Inside of vacuum canister
- Side of the motor housing
- On the rear base of the vacuum
- On the bottom of the belly of the vacuum
- On the frame near the engine
- On the side of the auger housing
- On the lower rear of the snow blower between wheels
- On the side of the motor housing
- On the shaft
Select an appliance to see where its model number is located.
