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Furnace & HVAC Sensors

Furnace & HVAC Sensors

Shop furnace and HVAC replacement sensors for residential, commercial, and industrial heating and cooling systems. Furnace Part Source carries temperature sensors, immersion sensors, humidity sensors, flow sensors, and safety probes from Honeywell, Siemens, Veris Industries, MAMAC Systems, System Sensor, and other leading brands.

Use the product list below to find the correct sensor by part number, sensor type, or equipment model. Always confirm resistance value, output signal, mounting style, and equipment model before ordering to help avoid compatibility issues.

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    Trane SEN0233 Flame Sensor

    Trane

    MSRP: $79.91
    Now: $61.75
    Flame Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements      
    MSRP: $79.91
    Now: $61.75
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    Trane SEN0205 Temperature Sensor; Set Of 2

    Trane

    MSRP: $660.07
    Now: $510.05
    Temperature Sensor; Set Of 2   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $660.07
    Now: $510.05
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    Trane SEN0204 90/250f 1/4"x5" Temperature Sensor

    Trane

    MSRP: $60.79
    Now: $46.97
    90/250f 1/4"x5" Temperature Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $60.79
    Now: $46.97
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    Trane SEN0182 9.75k Ohm Ambient Sensor Assmbly

    Trane

    MSRP: $107.50
    Now: $83.07
    9.75k Ohm Ambient Sensor Assmbly   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements      
    MSRP: $107.50
    Now: $83.07
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    Trane SEN0073 Flame Sensor

    Trane

    MSRP: $176.75
    Now: $136.58
    Flame Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $176.75
    Now: $136.58
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    MSRP: $176.75
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    Trane SEN0007 Flame Sensor

    Trane

    MSRP: $183.66
    Now: $141.92
    Flame Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $183.66
    Now: $141.92
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    MSRP: $183.66
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    Trane RES0171 Thermistor Ambient Sensor

    Trane

    MSRP: $22.49
    Now: $17.38
    Thermistor Ambient Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements      
    MSRP: $22.49
    Now: $17.38
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    Honeywell C7027A1049 Minipeeper Ultraviolet Flame Detector, Used for Coal, Gas and Oil Fired Burners

    Honeywell

    MSRP: $491.80
    Now: $380.03
    Honeywell C7027A1049 Minipeeper Ultraviolet Flame Detector Used for Coal, Gas and Oil Fired Burners
    MSRP: $491.80
    Now: $380.03
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    Fenwal 12-F27121-000-06 Sensor

    Fenwal

    MSRP: $462.16
    Now: $357.13
    Fenwal 12-F27121-000-06 Sensor Detect-A-Fire 325F FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements
    MSRP: $462.16
    Now: $357.13
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    Fenwal 12-E27121-000-04 (Replaces 12-X27121-000-190) Detect-A-Fire w/ Fast Response Time Index

    Fenwal

    MSRP: $522.97
    Now: $404.11
    Fenwal 12-E27121-000-04  (Replacement for 12-X27121-000-190) 190 degrees F, Close on Rise, White Color Coding, Vertical Mount, Hex Brass Mounting Head, 300 Stainless Steel Shell, Detect-A-Fire w/...
    MSRP: $522.97
    Now: $404.11
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    Fenwal 11-030002-000 Sensor

    Fenwal

    MSRP: $86.06
    Now: $66.50
    Fenwal 11-030002-000 Sensor  50-600f FLUSH MT TEMP    FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order...
    MSRP: $86.06
    Now: $66.50
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    Fenwal 05-100000-432 (Minimum purchase 10 ea) Ignitor Sensor

    Fenwal

    MSRP: $52.72
    Now: $39.94
    Fenwal 05-100000-432  (Minimum purchase 10 ea) Ignitor Sensor FurnacePartSource.com Commitment
    MSRP: $52.72
    Now: $39.94
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Furnace & HVAC Sensors

Furnace and HVAC sensors monitor temperature, airflow, flame presence, humidity, and other conditions that keep a heating or cooling system operating safely and efficiently. When a sensor fails or reads inaccurately, it can cause lockouts, poor comfort control, or unsafe operation.

Furnace Part Source carries a wide range of replacement sensors, including duct and immersion temperature sensors, outside air sensors, humidity sensors, flow sensors, and safety-related probes for residential, commercial, and industrial HVAC equipment.

Common Sensors We Carry

Common replacement sensors include:

  • Duct and immersion temperature sensors for supply, return, and water temperature readings.
  • Outside air temperature and humidity sensors for outdoor reset and economizer control.
  • Flow sensors for airflow and duct pressure monitoring.
  • Low-level and safety probe sensors for boiler and water-level protection.
  • Gas and smoke detection sensors for combustible gas and safety monitoring.

How to Find the Right Sensor

Before ordering, confirm the sensor's resistance value (such as 10K or 20K ohm), output signal type, mounting style, and the equipment model it is used with. Sensors that look similar can have different resistance curves or output signals, so matching by part number is the safest approach.

For best fit, compare:

  • Original sensor part number
  • Resistance value or output signal type
  • Sensor style, such as duct, immersion, outside air, or surface-mount
  • Equipment model and control system

Sensors From Leading HVAC Brands

Our catalog includes sensors from Honeywell, Siemens Building Technology, Veris Industries, MAMAC Systems, System Sensor, Dwyer Instruments, Aaon, Kele, and other major manufacturers, covering both standard replacement sensors and specialized industrial sensing equipment.

Need Help Matching a Sensor?

Not sure which sensor you need? Use the part number, resistance value, and control system information from your equipment to narrow the search, or contact Furnace Part Source for help identifying the correct replacement.

HVAC Sensor FAQs

What types of sensors does an HVAC system use?

HVAC systems commonly use temperature sensors, humidity sensors, flow sensors, flame sensors, and safety probes to monitor conditions and support proper system control.

How do I know what resistance value my sensor needs?

Check the original sensor's part number or the equipment documentation, which typically lists the resistance value, such as 10K or 20K ohm, required for compatibility.

Can a bad sensor cause my system to shut down?

Yes. A failed or inaccurate sensor reading can trigger lockouts or prevent proper operation, particularly for safety-related sensors like low-water or flame sensors.

Are furnace sensors and thermostat sensors the same?

No. Furnace and HVAC sensors typically monitor internal equipment conditions, while thermostat sensors read room temperature for comfort control. Always confirm the specific application before ordering.