Lennox 73K17 Limit Switch
As an HVAC technician, you know that a failed limit switch is a primary cause for furnace short cycling and overheating. The Lennox 73K17 is a genuine OEM limit switch designed specifically for Lennox, Allied, Armstrong, and Ducane heating units. This SPST normally closed high-limit control features a 7-inch insertion length, making it compatible with various air handlers and furnaces, such as the G23Q5/6 series. It operates as an auto reset limit switch, calibrated to interrupt the electrical circuit when the plenum temperature reaches its 235°F cutout point and automatically closes once it drops back to 205°F.
Replacing a faulty Lennox 73K1701 or 36T01B7 ensures that the system maintains safe operating temperatures, preventing damage to the heat exchanger and avoiding potential fire hazards. This 205-235F limit control is a direct drop-in replacement for part numbers L235-30F and A1131. When diagnosing a furnace that starts then stops, verifying continuity on this switch is a critical step in restoring reliable heating performance for your clients.
Key Benefits- OEM Precision: Specifically engineered for Lennox-manufactured equipment to ensure exact temperature calibration.
- Automatic Reset: Eliminates the need for manual intervention by resetting once temperatures normalize between 205°F and 235°F.
- Broad Compatibility: Replaces common part numbers including 73K1701, 44757, and 36T01B7 across Lennox and Allied brands.
- System Protection: Acts as a critical safety cutoff to prevent overheating during restricted airflow or blower failure.
What are the symptoms of a bad Lennox 73K17 limit switch?
The most common symptoms include the furnace blower running continuously despite no heat, or the furnace cycling off before reaching the thermostat setpoint because the switch is tripping prematurely.
Is the 73K17 an automatic or manual reset switch?
This is an automatic reset switch. If it trips, it will close the circuit on its own once the internal temperature drops to 205°F.
How do I test if this limit switch is defective?
Using a multimeter, check for continuity across the terminals while the switch is cool. If there is no continuity (the circuit is open) at room temperature, the switch is faulty and requires replacement.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Original: $10.30
-65%$10.30
$3.60Lennox 73K17 Limit Switch
As an HVAC technician, you know that a failed limit switch is a primary cause for furnace short cycling and overheating. The Lennox 73K17 is a genuine OEM limit switch designed specifically for Lennox, Allied, Armstrong, and Ducane heating units. This SPST normally closed high-limit control features a 7-inch insertion length, making it compatible with various air handlers and furnaces, such as the G23Q5/6 series. It operates as an auto reset limit switch, calibrated to interrupt the electrical circuit when the plenum temperature reaches its 235°F cutout point and automatically closes once it drops back to 205°F.
Replacing a faulty Lennox 73K1701 or 36T01B7 ensures that the system maintains safe operating temperatures, preventing damage to the heat exchanger and avoiding potential fire hazards. This 205-235F limit control is a direct drop-in replacement for part numbers L235-30F and A1131. When diagnosing a furnace that starts then stops, verifying continuity on this switch is a critical step in restoring reliable heating performance for your clients.
Key Benefits- OEM Precision: Specifically engineered for Lennox-manufactured equipment to ensure exact temperature calibration.
- Automatic Reset: Eliminates the need for manual intervention by resetting once temperatures normalize between 205°F and 235°F.
- Broad Compatibility: Replaces common part numbers including 73K1701, 44757, and 36T01B7 across Lennox and Allied brands.
- System Protection: Acts as a critical safety cutoff to prevent overheating during restricted airflow or blower failure.
What are the symptoms of a bad Lennox 73K17 limit switch?
The most common symptoms include the furnace blower running continuously despite no heat, or the furnace cycling off before reaching the thermostat setpoint because the switch is tripping prematurely.
Is the 73K17 an automatic or manual reset switch?
This is an automatic reset switch. If it trips, it will close the circuit on its own once the internal temperature drops to 205°F.
How do I test if this limit switch is defective?
Using a multimeter, check for continuity across the terminals while the switch is cool. If there is no continuity (the circuit is open) at room temperature, the switch is faulty and requires replacement.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
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Description
As an HVAC technician, you know that a failed limit switch is a primary cause for furnace short cycling and overheating. The Lennox 73K17 is a genuine OEM limit switch designed specifically for Lennox, Allied, Armstrong, and Ducane heating units. This SPST normally closed high-limit control features a 7-inch insertion length, making it compatible with various air handlers and furnaces, such as the G23Q5/6 series. It operates as an auto reset limit switch, calibrated to interrupt the electrical circuit when the plenum temperature reaches its 235°F cutout point and automatically closes once it drops back to 205°F.
Replacing a faulty Lennox 73K1701 or 36T01B7 ensures that the system maintains safe operating temperatures, preventing damage to the heat exchanger and avoiding potential fire hazards. This 205-235F limit control is a direct drop-in replacement for part numbers L235-30F and A1131. When diagnosing a furnace that starts then stops, verifying continuity on this switch is a critical step in restoring reliable heating performance for your clients.
Key Benefits- OEM Precision: Specifically engineered for Lennox-manufactured equipment to ensure exact temperature calibration.
- Automatic Reset: Eliminates the need for manual intervention by resetting once temperatures normalize between 205°F and 235°F.
- Broad Compatibility: Replaces common part numbers including 73K1701, 44757, and 36T01B7 across Lennox and Allied brands.
- System Protection: Acts as a critical safety cutoff to prevent overheating during restricted airflow or blower failure.
What are the symptoms of a bad Lennox 73K17 limit switch?
The most common symptoms include the furnace blower running continuously despite no heat, or the furnace cycling off before reaching the thermostat setpoint because the switch is tripping prematurely.
Is the 73K17 an automatic or manual reset switch?
This is an automatic reset switch. If it trips, it will close the circuit on its own once the internal temperature drops to 205°F.
How do I test if this limit switch is defective?
Using a multimeter, check for continuity across the terminals while the switch is cool. If there is no continuity (the circuit is open) at room temperature, the switch is faulty and requires replacement.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
