Lennox 18M10 Limit Switch
The Lennox 18M10 Limit Switch is a high-precision safety control designed for critical thermal monitoring in residential and commercial furnaces. This L160-40F limit switch functions as an auto-reset safety device, featuring a fixed opening temperature of 160°F and a closing differential at 40°F. Engineered with a single-pole, double-throw (SPDT) configuration, it offers versatile wiring options for complex heating circuits, ensuring the HVAC high limit remains within safe operational parameters. As a genuine Lennox OEM replacement part, it handles localized temperature spikes by breaking the circuit to the gas valve or ignition control once the threshold is breached, preventing heat exchanger damage. Its compact 2-inch footprint and snap-disc architecture make it a direct furnace limit switch replacement for units requiring the 18M10 or 18M1001 specification. Technicians can rely on its calibrated response for consistent furnace troubleshooting and long-term system protection across various Lennox platforms.
- Precise Safety Cut-out: Automatically opens the circuit at 160°F to prevent overheating and hazardous operation.
- Auto-Reset Technology: Restores circuit continuity once the temperature drops to 40°F, reducing unnecessary manual service calls.
- SPDT Switch Versatility: Provides single-pole, double-throw switching capability for both safety shutoff and diagnostic feedback.
- Direct OEM Fitment: Eliminates installation variances and mounting issues often found with universal aftermarket switches.
Common Questions:
What causes a Lennox 18M10 limit switch to trip?
Usually, a furnace limit switch trips due to restricted airflow caused by a dirty filter, failed blower motor, or blocked return vents. If the switch opens at 160°F, check the static pressure and blower speed first.
Can I use a manual reset switch in place of the 18M10?
No. This is an auto-reset switch (L160-40F). Replacing it with a manual reset style could disrupt the automated safety lifecycle of the furnace control board and Lennox diagnostic routines.
How do I test the Lennox 18M10 for continuity?
Disconnect power and leads, then use a multimeter to check for continuity across the terminals. If the switch is cool (below 160°F) and shows an open circuit, the internal bimetal disc has failed and requires replacement.
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: $24.90
-65%$24.90
$8.71Lennox 18M10 Limit Switch
The Lennox 18M10 Limit Switch is a high-precision safety control designed for critical thermal monitoring in residential and commercial furnaces. This L160-40F limit switch functions as an auto-reset safety device, featuring a fixed opening temperature of 160°F and a closing differential at 40°F. Engineered with a single-pole, double-throw (SPDT) configuration, it offers versatile wiring options for complex heating circuits, ensuring the HVAC high limit remains within safe operational parameters. As a genuine Lennox OEM replacement part, it handles localized temperature spikes by breaking the circuit to the gas valve or ignition control once the threshold is breached, preventing heat exchanger damage. Its compact 2-inch footprint and snap-disc architecture make it a direct furnace limit switch replacement for units requiring the 18M10 or 18M1001 specification. Technicians can rely on its calibrated response for consistent furnace troubleshooting and long-term system protection across various Lennox platforms.
- Precise Safety Cut-out: Automatically opens the circuit at 160°F to prevent overheating and hazardous operation.
- Auto-Reset Technology: Restores circuit continuity once the temperature drops to 40°F, reducing unnecessary manual service calls.
- SPDT Switch Versatility: Provides single-pole, double-throw switching capability for both safety shutoff and diagnostic feedback.
- Direct OEM Fitment: Eliminates installation variances and mounting issues often found with universal aftermarket switches.
Common Questions:
What causes a Lennox 18M10 limit switch to trip?
Usually, a furnace limit switch trips due to restricted airflow caused by a dirty filter, failed blower motor, or blocked return vents. If the switch opens at 160°F, check the static pressure and blower speed first.
Can I use a manual reset switch in place of the 18M10?
No. This is an auto-reset switch (L160-40F). Replacing it with a manual reset style could disrupt the automated safety lifecycle of the furnace control board and Lennox diagnostic routines.
How do I test the Lennox 18M10 for continuity?
Disconnect power and leads, then use a multimeter to check for continuity across the terminals. If the switch is cool (below 160°F) and shows an open circuit, the internal bimetal disc has failed and requires replacement.
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
The Lennox 18M10 Limit Switch is a high-precision safety control designed for critical thermal monitoring in residential and commercial furnaces. This L160-40F limit switch functions as an auto-reset safety device, featuring a fixed opening temperature of 160°F and a closing differential at 40°F. Engineered with a single-pole, double-throw (SPDT) configuration, it offers versatile wiring options for complex heating circuits, ensuring the HVAC high limit remains within safe operational parameters. As a genuine Lennox OEM replacement part, it handles localized temperature spikes by breaking the circuit to the gas valve or ignition control once the threshold is breached, preventing heat exchanger damage. Its compact 2-inch footprint and snap-disc architecture make it a direct furnace limit switch replacement for units requiring the 18M10 or 18M1001 specification. Technicians can rely on its calibrated response for consistent furnace troubleshooting and long-term system protection across various Lennox platforms.
- Precise Safety Cut-out: Automatically opens the circuit at 160°F to prevent overheating and hazardous operation.
- Auto-Reset Technology: Restores circuit continuity once the temperature drops to 40°F, reducing unnecessary manual service calls.
- SPDT Switch Versatility: Provides single-pole, double-throw switching capability for both safety shutoff and diagnostic feedback.
- Direct OEM Fitment: Eliminates installation variances and mounting issues often found with universal aftermarket switches.
Common Questions:
What causes a Lennox 18M10 limit switch to trip?
Usually, a furnace limit switch trips due to restricted airflow caused by a dirty filter, failed blower motor, or blocked return vents. If the switch opens at 160°F, check the static pressure and blower speed first.
Can I use a manual reset switch in place of the 18M10?
No. This is an auto-reset switch (L160-40F). Replacing it with a manual reset style could disrupt the automated safety lifecycle of the furnace control board and Lennox diagnostic routines.
How do I test the Lennox 18M10 for continuity?
Disconnect power and leads, then use a multimeter to check for continuity across the terminals. If the switch is cool (below 160°F) and shows an open circuit, the internal bimetal disc has failed and requires replacement.
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.
