Parts to Your Door 54209 Flue Sensor Peerless PF-210 PF-399

Product Description

The PARTS TO YOUR DOOR 54209 is a 12K flue sensor designed as a direct replacement component for Peerless PF-series boilers. Flue sensors monitor exhaust gas temperature in the flue pathway, providing the control system with the data it needs to verify safe combustion and proper venting. This sensor is installed by licensed HVAC technicians and plumbers servicing hydronic heating systems. The 12K designation refers to the thermistor resistance rating, which the boiler control board uses to read temperature accurately. Using the correct resistance rating is critical to proper control operation and system safety.

This flue sensor is intended for use in Peerless PF-series gas boilers used in residential and light commercial hydronic heating applications. It is positioned in the flue outlet of the boiler to monitor exhaust temperature during operation. Replacement is typically required when a sensor fails out-of-specification, triggering a fault code on the boiler control board, or during a scheduled maintenance interval. Proper sensor function supports accurate high-limit and venting diagnostics within the boiler control logic.

Key Features

• 12K thermistor rating matches OEM resistance specification for accurate temperature reading
• Direct replacement for the original Peerless flue sensor in PF-210 and PF-399 boilers
• Interfaces with the boiler control board for flue temperature monitoring and fault detection
• Designed for the flue sensing position in PF-series hydronic gas boilers

Compatibility

Compatible with Peerless PF-210 and PF-399 gas boilers as a direct flue sensor replacement.

Installation Notes

Installation should be performed by a licensed HVAC technician or plumber qualified to service gas boiler systems. Before replacing the flue sensor, shut down the boiler, set the thermostat to its lowest setting, and allow the system to cool completely before handling any flue components. Consult the boiler manufacturer service manual for sensor location and wiring terminal identification. Work on gas appliances must comply with applicable local codes and the International Fuel Gas Code (IFGC).

Technical Specifications

• Type: Flue Sensor
• Thermistor Rating: 12K

Standard Information

• Brand: PARTS TO YOUR DOOR
• Manufacturer Part Number: 54209