Weil Mclain 383-500-600 Sensor Kit

The Weil McLain 383-500-600 Flue Temperature Sensor Kit is a critical monitoring component designed specifically for Ultra Series 3 and Commercial gas boilers. This OEM replacement kit includes a high-accuracy dual sensor and a fresh sealing grommet to ensure airtight installation in the stainless steel vent pipe. As a veteran technician knows, maintaining precise exhaust thermal data is non-negotiable for boiler safety and efficiency. This sensor detects excessive flue temperatures, providing the necessary feedback to the U-Control module to manage firing rates or trigger a safety shutdown if heat exchanger fouling or incorrect combustion occurs. Designed for a 4-pin Molex connection, it offers a plug-and-play fit for residential models like the EVG 70, 110, and 155, as well as high-capacity Ultra 550 and 750 commercial units. Replacing a faulty sensor prevents nuisance lockouts and protects the venting system from thermal damage.

• Direct OEM Match: Engineered to original factory specifications for precise resistance-to-temperature calibration.
• Comprehensive Kit: Includes the flue sensor and the necessary grommet for a professional moisture-tight seal.
• Broad Compatibility: Fits the full range of Weil McLain Ultra Series 3 and larger commercial boilers.
• Operational Reliability: Essential for preventing high flue temperature lockouts and ensuring optimal heat exchanger performance.

Is this sensor compatible with Series 1 or Series 2 Ultra boilers?
No, this specific kit is configured for Series 3 models with the specific Molex wiring harness. Series 1 and 2 often utilize sensors with different thread pitches or stake-on terminals.

What are the symptoms of a failing flue temperature sensor?
Technicians typically see frequent safety lockouts, "flue sensor open" or "shorted" error codes on the display, or unexpected boiler modulation issues.

Does this kit include the mounting hardware?
The kit includes the sensor and the replacement grommet, which are the primary components required for securing the probe into the vent adapter.

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.