Weil McLain 383-500-055 Sensor Kit

Identify and resolve lockout conditions with the Weil McLain 383-500-055 Flue Temp Sensor Kit. Designed for Weil McLain Ultra Series 1 and 2 residential gas boilers, this genuine OEM replacement part is essential for monitoring exhaust gas temperatures and maintaining high-efficiency performance. When a flue temperature sensor fails or provides erratic resistance readings, the boiler control module typically triggers a safety shutdown to prevent heat exchanger damage. This kit includes the NTC thermistor sensor and the necessary grommet for a secure, airtight seal within the stainless steel vent pipe.

As a condensing boiler sensor, the 383-500-055 ensures the system operates within engineered thermal limits, specifically protecting the jacket assembly and internal components from overheating. Field-verified for Ultra-80, 105, 155, and 230 models, this HVAC replacement kit allows technicians to restore reliable modulation and safety sequencing without the need for universal workarounds that can compromise control board logic.

• Precise Thermal Monitoring: High-accuracy thermistor provides real-time flue gas data to the Weil McLain Ultra control board for precise firing rate adjustments.
• OEM Compatibility: Specifically engineered for Ultra Series 1 & 2 boilers, ensuring exact electrical resistance curves and physical fit.
• Safety Compliance: Prevents hazardous operating conditions by enabling the boiler's high-limit safety cut-out protocols when exhaust temperatures exceed thresholds.
• Complete Installation Kit: Includes the 383-500-055 sensor and specialized mounting grommet to maintain the integrity of the sealed combustion system.

Which boiler models are compatible with this sensor?
This kit is designed for Weil McLain Ultra Series 1 and Series 2 gas-fired boilers, covering sizes 80 through 230.

What are the symptoms of a faulty flue temperature sensor?
Common indicators include persistent "Soft Lockout" or "Hard Lockout" codes on the U-Control display, erratic temperature spikes, or the boiler failing to initiate the ignition sequence due to open-circuit errors.

Does this kit include the mounting hardware?
Yes, the 383-500-055 kit includes the NTC sensor and the specific rubber grommet required to seat the probe into the exhaust vent adapter.

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.