Lennox 38M69 Limit Switch
The Lennox 38M69 Limit Switch is a high-limit safety component engineered for precision temperature monitoring in commercial and residential HVAC systems. This SPST (Single Pole Single Throw) switch functions as a critical safety barrier, designed to break the electrical circuit and shut down the heating element if temperatures exceed safe operational parameters. Featuring a fixed 240F out (open) and 210F in (close) thermal profile, this bimetal disc limit switch ensures your furnace or air handler operates within its designed heat range, preventing heat exchanger damage and potential fire hazards. Identifying a Lennox 38M69 substitution or direct replacement is essential when your unit experienced short cycling or fails to initiate the ignition sequence due to a tripped safety circuit. Built to OEM specifications, this stilt-mount control provides the reliable thermal protection required by veteran contractors to restore system integrity and maintain air-side safety standards.
Key Benefits
- Safety Compliance: Prevents system overheating with a hardware-level high-limit cutout at 240°F.
- Automatic Reset: Features a 210°F reset point, allowing the system to resume normal operation once the plenum has cooled to a safe temperature.
- Direct Fit: Designed as a genuine Lennox replacement part (38M6901) for seamless installation in compatible furnace models.
- Reliable Switching: Utilizing SPST contacts, it offers a simplified and robust electrical path for 24V control circuits.
Common Questions
- What causes this limit switch to trip frequently? Excessive heat buildup is usually caused by restricted airflow, such as a clogged furnace filter, a failing blower motor, or blocked return air registers.
- How do I test the 38M69 for continuity? Using a multimeter set to the Ohms (Ω) setting, check for continuity across the terminals while the switch is at room temperature; it should show a closed circuit (0 ohms).
- Is this switch compatible with other HVAC brands? While designed specifically for Lennox and Allied Air equipment, it can be used in any application requiring a 240-30F secondary limit, provided the mounting footprint matches.
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: $12.33
-65%$12.33
$4.32Lennox 38M69 Limit Switch
The Lennox 38M69 Limit Switch is a high-limit safety component engineered for precision temperature monitoring in commercial and residential HVAC systems. This SPST (Single Pole Single Throw) switch functions as a critical safety barrier, designed to break the electrical circuit and shut down the heating element if temperatures exceed safe operational parameters. Featuring a fixed 240F out (open) and 210F in (close) thermal profile, this bimetal disc limit switch ensures your furnace or air handler operates within its designed heat range, preventing heat exchanger damage and potential fire hazards. Identifying a Lennox 38M69 substitution or direct replacement is essential when your unit experienced short cycling or fails to initiate the ignition sequence due to a tripped safety circuit. Built to OEM specifications, this stilt-mount control provides the reliable thermal protection required by veteran contractors to restore system integrity and maintain air-side safety standards.
Key Benefits
- Safety Compliance: Prevents system overheating with a hardware-level high-limit cutout at 240°F.
- Automatic Reset: Features a 210°F reset point, allowing the system to resume normal operation once the plenum has cooled to a safe temperature.
- Direct Fit: Designed as a genuine Lennox replacement part (38M6901) for seamless installation in compatible furnace models.
- Reliable Switching: Utilizing SPST contacts, it offers a simplified and robust electrical path for 24V control circuits.
Common Questions
- What causes this limit switch to trip frequently? Excessive heat buildup is usually caused by restricted airflow, such as a clogged furnace filter, a failing blower motor, or blocked return air registers.
- How do I test the 38M69 for continuity? Using a multimeter set to the Ohms (Ω) setting, check for continuity across the terminals while the switch is at room temperature; it should show a closed circuit (0 ohms).
- Is this switch compatible with other HVAC brands? While designed specifically for Lennox and Allied Air equipment, it can be used in any application requiring a 240-30F secondary limit, provided the mounting footprint matches.
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.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Lennox 38M69 Limit Switch is a high-limit safety component engineered for precision temperature monitoring in commercial and residential HVAC systems. This SPST (Single Pole Single Throw) switch functions as a critical safety barrier, designed to break the electrical circuit and shut down the heating element if temperatures exceed safe operational parameters. Featuring a fixed 240F out (open) and 210F in (close) thermal profile, this bimetal disc limit switch ensures your furnace or air handler operates within its designed heat range, preventing heat exchanger damage and potential fire hazards. Identifying a Lennox 38M69 substitution or direct replacement is essential when your unit experienced short cycling or fails to initiate the ignition sequence due to a tripped safety circuit. Built to OEM specifications, this stilt-mount control provides the reliable thermal protection required by veteran contractors to restore system integrity and maintain air-side safety standards.
Key Benefits
- Safety Compliance: Prevents system overheating with a hardware-level high-limit cutout at 240°F.
- Automatic Reset: Features a 210°F reset point, allowing the system to resume normal operation once the plenum has cooled to a safe temperature.
- Direct Fit: Designed as a genuine Lennox replacement part (38M6901) for seamless installation in compatible furnace models.
- Reliable Switching: Utilizing SPST contacts, it offers a simplified and robust electrical path for 24V control circuits.
Common Questions
- What causes this limit switch to trip frequently? Excessive heat buildup is usually caused by restricted airflow, such as a clogged furnace filter, a failing blower motor, or blocked return air registers.
- How do I test the 38M69 for continuity? Using a multimeter set to the Ohms (Ω) setting, check for continuity across the terminals while the switch is at room temperature; it should show a closed circuit (0 ohms).
- Is this switch compatible with other HVAC brands? While designed specifically for Lennox and Allied Air equipment, it can be used in any application requiring a 240-30F secondary limit, provided the mounting footprint matches.
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.
