Carrier LH680534 Flame Sensor

The Carrier LH680534 Flame Sensor is a critical safety component designed for precise flame rectification in residential and commercial heating units. As a direct OEM replacement flame sensor, this part is engineered to interface seamlessly with the integrated furnace control (IFC) to monitor burner ionization. This specific model serves as the factory-authorized successor to several legacy part numbers, providing a standardized solution for technicians maintaining Carrier HVAC systems. When a furnace experiences short-cycling or fails to sustain a burner ignition sequence after the trial for ignition period, a fouled or degraded sensor is often the culprit. The LH680534 features a high-grade Kanthal sensor rod capable of withstanding extreme thermal cycling, ensuring reliable microamp signal transmission back to the control board. Utilizing this genuine furnace flame sensor replacement ensures the equipment operates within original manufacturer specifications for sequence of operation and combustion safety.

Technical Specifications & Compatibility:

• Direct Replacement for: LH680012, LH680014, LH33WZ515, LH33WZ517, and LH33WZ521.
• Function: Detects burner flame to allow continued gas valve energization and prevent hazardous unburned gas accumulation.
• Material: High-temperature resistant alumina ceramic insulator and durable metal alloy probe.
• Application: Compatible with various Carrier, Bryant, and Payne gas-fired furnaces.

Common Questions for Technicians:

Why is the burner shutting off after only a few seconds?
If the control board does not receive a sufficient microamp signal from the Carrier LH680534 within the safety timing window, it will de-energize the gas valve. Cleaning the sensor may provide a temporary fix, but replacement is recommended if the ceramic insulator is cracked or the metal is severely oxidized.

How do I test this flame sensor?
Set your multimeter to the DC microamp (µA) scale and wire it in series with the flame sensor lead. A healthy LH680534 Flame Sensor typically produces a steady signal between 1.5 to 5.0 microamps, depending on the specific furnace control board requirements.

Does this fit older LH33 series models?
Yes, this unit is the official superseding part for various older versions, including the LH33WZ515 and LH33WZ521, ensuring the correct offset and mounting bracket alignment for a quick furnace repair.

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.