Heat Controller R68GF0004 Flame Sensor

The Heat Controller R68GF0004 Flame Sensor is a critical OEM safety component engineered for precise flame rectification in Mortex G18D series gas furnaces. As a veteran technician knows, a fouled or oxidized sensor is the primary culprit behind modern furnace short cycling. This furnace flame sensor replacement features a high-grade stainless steel rod designed to withstand extreme combustion temperatures while maintaining the sensitive microamp signal required by the integrated furnace control board. When your system undergoes a furnace ignition failure, replacing the sensor ensures the flame rectification process functions correctly, preventing the gas valve from closing prematurely after the initial light-off.

Built for durability in high-demand residential and mobile home applications, the R68GF0004 provides a reliable alternative to generic HVAC replacement parts. It is specifically designed to sense the presence of a blue burner flame and signal the control module to stay energized. Using a genuine Mortex flame sensor ensures the mounting geometry and electrical terminal match factory specifications, eliminating the need for field modifications and reducing callbacks for furnace repair professionals.

• Universal G18D Compatibility: Direct-fit for Mortex and Heat Controller G18D series units, ensuring immediate restoration of the safety circuit.
• Optimized Flame Detection: High-conductivity flame sensor rod prevents nuisance lockouts and ensures stable microamp readings.
• Enhanced System Safety: Immediately shuts down the gas valve if no flame is detected, preventing dangerous fuel accumulation.
• Reliable OEM Construction: Durable ceramic insulator prevents electrical leakage to the ground, even in high-moisture environments.

• How do I know if my R68GF0004 is bad? If your furnace ignites but shuts down within 5 to 10 seconds, the HVAC flame sensor is likely not sending a return signal to the board.
• Can I clean a flame sensor instead of replacing it? While cleaning a furnace flame sensor with steel wool can temporarily remove carbon buildup, oxidation eventually pits the metal, making a full replacement the only professional long-term fix.
• Where is the flame sensor located in a Mortex furnace? It is typically mounted on the burner assembly opposite the hot surface igniter, positioned so the probe sits directly in the path of the furthest burner flame.

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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.