Lennox 98G47 Roll Out Switch

As an experienced tech, you know that a tripped rollout switch is never the root cause—it’s the symptom of a serious combustion or induction failure. The Lennox 98G47 is a critical thermal fuse rollout switch calibrated to 171 degrees Fahrenheit. This OEM furnace safety part is engineered to monitor the burner vestibule and instantly interrupt the heating circuit if it detects a flame rollout or excessive heat buildup, typically caused by a cracked heat exchanger or a blocked flue. Unlike manual reset switches, this 171F rollout switch is a thermal cutoff fuse; once it reaches its limit, the internal link melts to ensure the system remains in a hard lockout until the underlying airflow or combustion issue is diagnosed and remediated by a professional.

The 98G47 features a 10 amp, 250V rating and is an authentic Lennox replacement part for diverse applications including Lennox GCS16, GCS24, and GHP16 series units. Its spst open-on-rise action provides immediate protection against fire hazards and carbon monoxide leakage into the structure. When you see a furnace diagnostic code for an open rollout circuit, verify your heat exchanger integrity and inducer performance before swapping in this 98G47 thermal fuse. This part is essential for maintaining the HVAC safety lockout sequence and ensuring the gas furnace operates within its UL-rated thermal parameters.

• Precision Thermal Calibration: Fixed 171°F trip point ensures rapid response to abnormal heat conditions in the burner compartment.
• OEM Compatibility: Exact drop-in replacement for Lennox burner rollout switches in commercial and residential furnace models.
• Enhanced System Safety: Critical thermal cutoff functionality prevents continuous operation during dangerous flame rollout events.
• High Electrical Rating: Rated for up to 10 Amps at 250 Volts, making it robust enough for heavy-duty HVAC control circuits.
• Standardized Integration: Compact 4-inch insertion design allows for straightforward mounting in existing Lennox burner assemblies.

• Can I reset the Lennox 98G47 switch? No, this is a thermal fuse (one-time use) and does not have a manual reset button. If the circuit is open, the part must be replaced after the primary safety issue is resolved.
• What causes this switch to trip? Common causes include a soot-clogged heat exchanger, a failing inducer motor, or obstructed vent piping causing flames to "roll out" toward the burners.
• How do I test the 98G47? Using a multimeter set to continuity (ohms), check across the two terminals. If the meter shows "OL" or no continuity, the internal fuse has blown and the part needs 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.