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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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    Carrier 48GS400192 Flame Sensor

    Carrier

    MSRP: $26.35
    Now: $20.36
    Flame Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $26.35
    Now: $20.36
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    Carrier 48DP500613 Flame Sensor

    Carrier

    MSRP: $121.64
    Now: $93.99
    Flame Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $121.64
    Now: $93.99
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    MSRP: $121.64
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    Carrier 48DJ501022 Ignitor Wire/Sensor

    Carrier

    MSRP: $44.39
    Now: $33.63
    Ignitor Wire/Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $44.39
    Now: $33.63
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    Carrier 48DJ500653 Flame Sensor

    Carrier

    MSRP: $124.82
    Now: $94.56
    Flame Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $124.82
    Now: $94.56
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    MSRP: $124.82
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    Carrier 33ZCT59SPT Wall Sensor

    Carrier

    MSRP: $735.97
    Now: $568.70
    Wall Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $735.97
    Now: $568.70
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    MSRP: $735.97
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    Carrier 33ZCT56SPT Space Sensor W/ Override Button

    Carrier

    MSRP: $148.90
    Now: $115.06
    Space Sensor W/ Override Button   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements      
    MSRP: $148.90
    Now: $115.06
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    MSRP: $148.90
    Now: $115.06
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    Carrier 33ZCSENOAT Outdoor Air Sensor

    Carrier

    MSRP: $13.94
    Now: $10.77
    Outdoor Air Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements      
    MSRP: $13.94
    Now: $10.77
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    MSRP: $13.94
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    Carrier 30GT412176 Temperature Sensor

    Carrier

    MSRP: $176.60
    Now: $136.46
    Temperature Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $176.60
    Now: $136.46
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    MSRP: $176.60
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    Carrier 30GB660002 Temperature Thermistor Sensor

    Carrier

    MSRP: $337.77
    Now: $261.01
    Carrier 30GB660002  Temperature Thermistor Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order...
    MSRP: $337.77
    Now: $261.01
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    MSRP: $337.77
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    Carrier 12B0005N01 Condensate Sensor

    Climatemaster

    MSRP: $13.50
    Now: $10.43
    Condensate Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $13.50
    Now: $10.43
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    MSRP: $13.50
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    Carrier 10HB50106801 3" Sensor Well

    Carrier

    MSRP: $79.73
    Now: $61.61
    3" Sensor Well   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $79.73
    Now: $61.61
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    MSRP: $79.73
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    Trane SEN1951 Flame Sensor

    Trane

    MSRP: $131.09
    Now: $99.31
    Flame Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements      
    MSRP: $131.09
    Now: $99.31
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    MSRP: $131.09
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    Trane SEN1578 Programmable Zone Sensor

    Trane

    MSRP: $657.44
    Now: $508.02
    Programmable Zone Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $657.44
    Now: $508.02
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    MSRP: $657.44
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    Trane SEN1577 Programmable Zone Sensor

    Trane

    MSRP: $593.85
    Now: $458.89
    Programmable Zone Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements      
    MSRP: $593.85
    Now: $458.89
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    MSRP: $593.85
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    Trane SEN1540 Ambient Sensor Assembly

    Trane

    MSRP: $22.52
    Now: $17.40
    Ambient Sensor Assembly   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements      
    MSRP: $22.52
    Now: $17.40
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    MSRP: $22.52
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    Trane SEN1526 Cl/Off/Ht/Fan Fan System Sensor

    Trane

    MSRP: $196.14
    Now: $151.56
    Cl/Off/Ht/Fan Fan System Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $196.14
    Now: $151.56
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    MSRP: $196.14
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    Trane SEN1524 Zone Sensor/Stat; 2 Speed Fan

    Trane

    MSRP: $207.70
    Now: $160.50
    Zone Sensor/Stat; 2 Speed Fan   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $207.70
    Now: $160.50
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    MSRP: $207.70
    Now: $160.50
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    Trane SEN1523 Zone Sensor

    Trane

    MSRP: $456.62
    Now: $352.84
    Zone Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $456.62
    Now: $352.84
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    MSRP: $456.62
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    Trane SEN1520 3Spd Fan Stat & Sensor

    Trane

    MSRP: $184.44
    Now: $142.52
    3Spd Fan Stat & Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $184.44
    Now: $142.52
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    MSRP: $184.44
    Now: $142.52
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    Trane SEN1519 3Speed Fan Sensor

    Trane

    MSRP: $182.52
    Now: $141.04
    3Speed Fan Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $182.52
    Now: $141.04
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    MSRP: $182.52
    Now: $141.04
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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.