When you are troubleshooting a Raypak pool heater that experiences intermittent ignition or rapid lockout, the Raypak 006535F Flame Sensor is often the first component to inspect. This OEM factory replacement part—also identified by model number HENGHUI ZH-251A—is a critical safety element for flame rectification. It works by sending a microamp signal to the ignition control module once a flame is detected, ensuring the gas valve remains open only during safe combustion. Built with a high-grade ceramic insulator and a durable metallic rod, this flame electrode is engineered to withstand the high-temperature environment of the burner tray. It is specifically designed for Raypak commercial pool heaters, including models 992, 1262, 1532, and 1802. For a reliable repair, always ensure the mounting bracket is securely grounded to the chassis and that the sensor tip is positioned directly in the outer edge of the flame path for optimal thermal conductivity and signal accuracy. Key Benefits: OEM Precision: Genuine replacement flame sensor ensures exact compatibility with Raypak gas heaters, maintaining the original safety specifications. Reliable Flame Sensing: High-performance flame sensing electrode prevents "false positive" or "flame not sensed" error codes. Enhanced Durability: Robust construction stands up to heavy-duty Raypak 1532 and Raypak 1802 heater cycles. Simplified Installation: Standard dual-hole metal bracket provides a perfect fit for faster field service. Common Questions: How do I know if my Raypak flame sensor is bad? If your Raypak heater ignites for a few seconds and then shuts down, it is likely not detecting a flame. Check the flame sensor 006535F for soot buildup or cracks in the porcelain. Often, a "sens" or "flame failure" error on the digital display indicates the module is not receiving the required microamp signal. Can I clean the 006535F flame sensor instead of replacing it? You can temporarily restore function by gently cleaning the rod with a fine emery cloth to remove oxidation. However, if the ceramic insulator is cracked or the metal is heavily pitted, a full flame sensor replacement is necessary to prevent repeated system lockouts. Where is the flame sensor located on Raypak commercial models? The sensor is typically mounted on the burner plate, positioned so the metal rod sits in the path of the flames between the burners and the heat exchanger. It is easily distinguished from the ignitor by its single-wire connection and thinner rod profile. This item is not eligible for free shipping. 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.
