Lennox 98G46 Limit Switch
The Lennox 98G46 Limit Switch is a critical safety component designed for precise thermal management in high-efficiency HVAC systems. This OEM 140F Limit Control functions as a primary high-limit safety, featuring an auto-reset mechanism that triggers at specific temperature thresholds to prevent heat exchanger damage. Formally rated for a 100-140F range, this SPDT limit switch accurately monitors internal plenum temperatures, interrupting the burner circuit if the 140°F "open" setpoint is reached while maintaining the blower operation to dissipate residual heat. Once the temperature drops back to the 100°F "close" differential, the switch resets, allowing the ignition sequence to resume. Engineered for Lennox furnace compatibility across multiple GCS and merit series units, this 98G4601 replacement part ensures the system operates within manufacturer-specified safety parameters. For veteran techs, this part is a drop-in solution for resolving E250 fault codes or intermittent "open limit" errors caused by restricted airflow or thermal fatigue in older controls.
Key Benefits for HVAC Professionals- Precision Thermal Calibration: Fixed 140°F opening point with a 40-degree differential for consistent furnace safety limit performance.
- Universal OEM Compatibility: Verified replacement for Lennox 98G4601 and compatible with dozens of commercial and residential models.
- Robust SPDT Construction: Durable automatic reset limit switch housing designed to withstand high-cycle thermal stress without drift.
- Plug-and-Play Integration: Standard terminal configuration for fast field installation during emergency service calls.
What causes a Lennox 98G46 to trip prematurely?
Frequent tripping is often a symptom of restricted system airflow. Check for a clogged air filter, dirty evaporator coils, or undersized ductwork causing high static pressure and elevated plenum temperatures.
Can I test this switch with a multimeter?
Yes. At room temperature, the switch should show continuity (0 ohms). If it remains open at ambient temperature, the internal bi-metal disc has likely failed or reached its end-of-life and requires replacement.
Is this an "Open on Rise" or "Close on Rise" control?
This is an Open on Rise safety switch. The electrical contacts are normally closed to allow operation and will snap open when the temperature exceeds 140°F.
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: $30.05
-65%$30.05
$10.52Lennox 98G46 Limit Switch
The Lennox 98G46 Limit Switch is a critical safety component designed for precise thermal management in high-efficiency HVAC systems. This OEM 140F Limit Control functions as a primary high-limit safety, featuring an auto-reset mechanism that triggers at specific temperature thresholds to prevent heat exchanger damage. Formally rated for a 100-140F range, this SPDT limit switch accurately monitors internal plenum temperatures, interrupting the burner circuit if the 140°F "open" setpoint is reached while maintaining the blower operation to dissipate residual heat. Once the temperature drops back to the 100°F "close" differential, the switch resets, allowing the ignition sequence to resume. Engineered for Lennox furnace compatibility across multiple GCS and merit series units, this 98G4601 replacement part ensures the system operates within manufacturer-specified safety parameters. For veteran techs, this part is a drop-in solution for resolving E250 fault codes or intermittent "open limit" errors caused by restricted airflow or thermal fatigue in older controls.
Key Benefits for HVAC Professionals- Precision Thermal Calibration: Fixed 140°F opening point with a 40-degree differential for consistent furnace safety limit performance.
- Universal OEM Compatibility: Verified replacement for Lennox 98G4601 and compatible with dozens of commercial and residential models.
- Robust SPDT Construction: Durable automatic reset limit switch housing designed to withstand high-cycle thermal stress without drift.
- Plug-and-Play Integration: Standard terminal configuration for fast field installation during emergency service calls.
What causes a Lennox 98G46 to trip prematurely?
Frequent tripping is often a symptom of restricted system airflow. Check for a clogged air filter, dirty evaporator coils, or undersized ductwork causing high static pressure and elevated plenum temperatures.
Can I test this switch with a multimeter?
Yes. At room temperature, the switch should show continuity (0 ohms). If it remains open at ambient temperature, the internal bi-metal disc has likely failed or reached its end-of-life and requires replacement.
Is this an "Open on Rise" or "Close on Rise" control?
This is an Open on Rise safety switch. The electrical contacts are normally closed to allow operation and will snap open when the temperature exceeds 140°F.
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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Product Information
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Description
The Lennox 98G46 Limit Switch is a critical safety component designed for precise thermal management in high-efficiency HVAC systems. This OEM 140F Limit Control functions as a primary high-limit safety, featuring an auto-reset mechanism that triggers at specific temperature thresholds to prevent heat exchanger damage. Formally rated for a 100-140F range, this SPDT limit switch accurately monitors internal plenum temperatures, interrupting the burner circuit if the 140°F "open" setpoint is reached while maintaining the blower operation to dissipate residual heat. Once the temperature drops back to the 100°F "close" differential, the switch resets, allowing the ignition sequence to resume. Engineered for Lennox furnace compatibility across multiple GCS and merit series units, this 98G4601 replacement part ensures the system operates within manufacturer-specified safety parameters. For veteran techs, this part is a drop-in solution for resolving E250 fault codes or intermittent "open limit" errors caused by restricted airflow or thermal fatigue in older controls.
Key Benefits for HVAC Professionals- Precision Thermal Calibration: Fixed 140°F opening point with a 40-degree differential for consistent furnace safety limit performance.
- Universal OEM Compatibility: Verified replacement for Lennox 98G4601 and compatible with dozens of commercial and residential models.
- Robust SPDT Construction: Durable automatic reset limit switch housing designed to withstand high-cycle thermal stress without drift.
- Plug-and-Play Integration: Standard terminal configuration for fast field installation during emergency service calls.
What causes a Lennox 98G46 to trip prematurely?
Frequent tripping is often a symptom of restricted system airflow. Check for a clogged air filter, dirty evaporator coils, or undersized ductwork causing high static pressure and elevated plenum temperatures.
Can I test this switch with a multimeter?
Yes. At room temperature, the switch should show continuity (0 ohms). If it remains open at ambient temperature, the internal bi-metal disc has likely failed or reached its end-of-life and requires replacement.
Is this an "Open on Rise" or "Close on Rise" control?
This is an Open on Rise safety switch. The electrical contacts are normally closed to allow operation and will snap open when the temperature exceeds 140°F.
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.
