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Switches & Sensors

Switches and sensors are the safety backbone of your HVAC system. Shop flame sensors, pressure switches, limit switches, sail switches, temperature sensors, and time-delay relays at our Dallas HVAC parts store.When your furnace locks out or your AC short-cycles, a faulty switch or sensor is often the culprit. Bring in the old part or your unit’s model number and we’ll get you the right match. Browse our repair tutorials for diagnostic help. Serving Dallas-Fort Worth homeowners and contractors.

Parts are in-store only — we don’t ship. Bring the old switch or sensor to the counter and we’ll match it while you wait.

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We test parts at the counter and match the right replacement. Walk in or call ahead.
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In-Store Pickup Only — Browse our catalog below, then visit us in Dallas or call (214) 340-9421 to purchase.
All
Air Distribution ▼
AIR GRILLES & REGISTERSB-VENT (DOUBLEWALL)DUCT FANDUCTINGINSULATIONSHEET METAL
Electrical Components ▼
CAPACITORCIRCUIT BREAKERCONDUITCONTACTORCONTROL BOARDFAN RELAYFUSESURGE PROTECTORTIME DELAY RELAYTRANSFORMERWIRE
Equipment & Systems ▼
CONDENSATE PUMPEQUIPMENTEQUIPMENT MOUNTMINISPLIT ACCESSORIES
Filters & Air Quality ▼
AIR FILTERCHEMICALSUV LIGHT
Furnace & Heating ▼
GAS VALVEIGNITOR - FURNACE
Motors & Blower Parts ▼
BLOWER MOTORBLOWER WHEELCONDENSER MOTORFAN BLADEINDUCER MOTORMOTOR MOUNT
Refrigeration ▼
COMPRESSORDRIER - REFRIGERANTEXPANSION VALVEPISTONREFRIGERANTREVERSING VALVESERVICE VALVESIGHTGLASS
Switches & Sensors ▼
DOOR SWITCHDRAIN SAFETY SWITCHFLAME SENSORHEAT SEQUENCERLIMIT SWITCHPRESSURE SWITCH - FURNACEPRESSURE SWITCH - REFRIGERANTTHERMAL LIMIT
Thermostats & Zone Controls ▼
THERMOSTATZONE SYSTEM
Tools & Supplies ▼
1/4" SERVICE CAPADHESIVEBRAZING CONSUMABLESCEILING ACCESS PANELCOPPERFASTENERSGAS PIPEOILPLASTIC DRAIN PANPVCSERVICE DISCONNECTTOOLS
All parts 1,617Equipment & Systems 119Filters & Air Quality 106Air Distribution 276Furnace & Heating 51Refrigeration 90Thermostats & Zone Controls 23Switches & Sensors 168Electrical Components 277Motors & Blower Parts 161Tools & Supplies 349
REFINELIMIT SWITCH 83PRESSURE SWITCH - FURNACE 24FLAME SENSOR 20HEAT SEQUENCER 16PRESSURE SWITCH - REFRIGERANT 11DOOR SWITCH 7DRAIN SAFETY SWITCH 6THERMAL LIMIT 1

Showing 145–168 of 168 results

  • Low StockSHP450250 - REFRIGERANT HIGH PRESSURE SWITCH (OPEN @ 450 PSI)
    SUPCO

    SHP450250 – REFRIGERANT HIGH PRESSURE SWITCH (OPEN @ 450 PSI)

    SKU · PHP450250
    $32.05

    Supco high-pressure switch — opens at 450 PSI, closes at 250 PSI. 1/4″ SAE flare fitting, auto-reset. Protects compressor from high head pressure.

  • Low StockSHP600475 - REFRIGERANT HIGH PRESSURE SWITCH (OPEN @ 600 PSI)
    SUPCO

    SHP600475 – REFRIGERANT HIGH PRESSURE SWITCH (OPEN @ 600 PSI)

    SKU · PHP600475
    $38.61

    Supco high-pressure switch — opens at 600 PSI, closes at 475 PSI. 1/4″ SAE flare fitting, auto-reset. Protects compressor from high head pressure.

  • Low StockSLP1025 - REFRIGERANT LOW PRESSURE SWITCH (OPEN @ 10 PSI)
    SUPCO

    SLP1025 – REFRIGERANT LOW PRESSURE SWITCH (OPEN @ 10 PSI)

    SKU · SLP1025
    $32.05

    Supco low-pressure switch — opens at 10 PSI, closes at 25 PSI. 1/4″ SAE flare fitting, auto-reset. Protects compressor from low refrigerant pressure.

  • Low StockSLP2045 - REFRIGERANT LOW PRESSURE SWITCH (OPEN @ 20 PSI)
    SUPCO

    SLP2045 – REFRIGERANT LOW PRESSURE SWITCH (OPEN @ 20 PSI)

    SKU · PLP2045
    $32.05

    Supco low-pressure switch — opens at 20 PSI, closes at 45 PSI. 1/4″ SAE flare fitting, auto-reset. Protects compressor from low refrigerant pressure.

  • Low StockSLP2565 - REFRIGERANT LOW PRESSURE SWITCH (OPEN @ 25 PSI)
    SUPCO

    SLP2565 – REFRIGERANT LOW PRESSURE SWITCH (OPEN @ 25 PSI)

    SKU · PLP2565
    $32.05

    Supco low-pressure switch — opens at 25 PSI, closes at 65 PSI. 1/4″ SAE flare fitting, auto-reset. Protects compressor from low refrigerant pressure.

  • Low StockSLP3560 - REFRIGERANT LOW PRESSURE SWITCH (OPEN @ 35 PSI)
    SUPCO

    SLP3560 – REFRIGERANT LOW PRESSURE SWITCH (OPEN @ 35 PSI)

    SKU · PLP3560
    $32.05

    Supco low-pressure switch — opens at 35 PSI, closes at 60 PSI. 1/4″ SAE flare fitting, auto-reset. Protects compressor from low refrigerant pressure.

  • Low StockSLP4080 - REFRIGERANT LOW PRESSURE SWITCH (OPEN @ 40 PSI)
    SUPCO

    SLP4080 – REFRIGERANT LOW PRESSURE SWITCH (OPEN @ 40 PSI)

    SKU · PLP4080
    $32.05

    Supco low-pressure switch — opens at 40 PSI, closes at 80 PSI. 1/4″ SAE flare fitting, auto-reset. Protects compressor from low refrigerant pressure.

  • Low StockSLP4560 - REFRIGERANT LOW PRESSURE SWITCH (OPEN @ 45 PSI)
    SUPCO

    SLP4560 – REFRIGERANT LOW PRESSURE SWITCH (OPEN @ 45 PSI)

    SKU · PLP4560
    $32.05

    Supco low-pressure switch — opens at 45 PSI, closes at 60 PSI. 1/4″ SAE flare fitting, auto-reset. Protects compressor from low refrigerant pressure.

  • Low StockSLP5090 - REFRIGERANT LOW PRESSURE SWITCH (OPEN @ 50 PSI)
    SUPCO

    SLP5090 – REFRIGERANT LOW PRESSURE SWITCH (OPEN @ 50 PSI)

    SKU · PLP5090
    $32.05

    Supco low-pressure switch — opens at 50 PSI, closes at 90 PSI. 1/4″ SAE flare fitting, auto-reset. Protects compressor from low refrigerant pressure.

  • In StockSLS140 - TEMPERATURE LIMIT SWITCH (MICRO, AUTO, L140°)
    SUPCO

    SLS140 – AUTO LIMIT SWITCH (MICRO, L140°)

    SKU · MAL140
    $15.01

    Supco SLS140 auto reset micro limit switch, opens at 140°F, closes at 100°F. Compact design with angled terminals. Universal fit for furnaces and unit heaters.

  • In StockSLS150 - TEMPERATURE LIMIT SWITCH (MICRO, AUTO, L150°)
    SUPCO

    SLS150 – AUTO LIMIT SWITCH (MICRO, L150°)

    SKU · MAL150
    $15.01

    Supco SLS150 auto reset micro limit switch, opens at 150°F, closes at 110°F. Compact design with angled terminals. Universal fit for furnaces and unit heaters.

  • In StockSLS160 - TEMPERATURE LIMIT SWITCH (MICRO, AUTO, L160°)
    SUPCO

    SLS160 – AUTO LIMIT SWITCH (MICRO, L160°)

    SKU · MAL160
    $15.01

    Supco SLS160 auto reset micro limit switch, opens at 160°F, closes at 120°F. Compact design with angled terminals. Universal fit for furnaces and unit heaters.

  • In StockSLS170 - TEMPERATURE LIMIT SWITCH (MICRO, AUTO, L170°)
    SUPCO

    SLS170 – AUTO LIMIT SWITCH (MICRO, L170°)

    SKU · MAL170
    $15.01

    Supco SLS170 auto reset micro limit switch, opens at 170°F, closes at 130°F. Compact design with angled terminals. Universal fit for furnaces and unit heaters.

  • In StockSLS180 - TEMPERATURE LIMIT SWITCH (MICRO, AUTO, L180°)
    SUPCO

    SLS180 – AUTO LIMIT SWITCH (MICRO, L180°)

    SKU · MAL180
    $15.01

    Supco SLS180 auto reset micro limit switch, opens at 180°F, closes at 140°F. Crosses to Nordyne 626563 and 626614. Universal fit for furnaces and heaters.

  • In StockSLS200 - TEMPERATURE LIMIT SWITCH (MICRO, AUTO, L200°)
    SUPCO

    SLS200 – AUTO LIMIT SWITCH (MICRO, L200°)

    SKU · MAL200
    $15.01

    Supco SLS200 auto reset micro limit switch, opens at 200°F, closes at 160°F. Compact design with angled terminals. Universal fit for furnaces and unit heaters.

  • In StockSLS300 - TEMPERATURE LIMIT SWITCH (MICRO, AUTO, L300°)
    SUPCO

    SLS300 – AUTO LIMIT SWITCH (MICRO, L300°)

    SKU · MAL300
    $15.25

    Supco SLS300 auto reset rollout switch, opens at 300°F, closes at 250°F. Compact micro size with angled terminals. Used as a flame rollout safety switch.

  • Low StockSOS-1 - FLOAT SWITCH
    DIVERSITECH

    SOS-1 – FLOAT SWITCH

    SKU · SOS-1
    $18.25

    DiversiTech Asurity solid-state condensate overflow safety switch. It clamps onto a 3/4" PVC drain line and senses a near-full pipe without cutting into it, then opens the 24 VAC circuit to the compressor contactor so the coil stops making condensate.

  • In StockFSC5002U - FLOAT SWITCH
    UNIVERSAL

    SOS-2 – FLOAT SWITCH

    SKU · SOS-2
    $17.50

    Condensate overflow safety switch, companion to the SOS-1 overflow switch. It opens the low-voltage control circuit when the drain line or pan backs up, shutting the equipment down before water damage occurs.

  • In StockSSRT3165 - RED SILICONE TUBING (INDUCER SWITCH TUBING, 1/4 ID x 60)
    SUPCO

    SSRT3165 – RED SILICONE TUBING (INDUCER SWITCH TUBING, 1/4″ ID x 60″)

    SKU · SSRT3165
    $9.73

    Supco SSRT3165 red silicone pressure switch tubing, 1/4″ ID x 60″. Handles -100°F to 500°F. Replaces cracked or melted rubber tubing on furnace inducer pressure switches.

  • In StockSWT01714 - DOOR INTERLOCK SWITCH (TRANE, CARRIER, YORK)
    TRANE

    SWT01714 – DOOR INTERLOCK SWITCH (TRANE, CARRIER, YORK)

    SKU · 1171981
    $18.59

    Universal door interlock switch (SWT01714). Fits Trane, Carrier, York, and more. SPST, 125/250VAC, 21A rated. Shuts off the furnace when the access panel is removed.

  • In StockSWT02173 - MANUAL LIMIT SWITCH (TEAR DROP, L310°)
    TRANE

    SWT02173 – MANUAL LIMIT SWITCH (TEAR DROP, L310°)

    SKU · SWT02173
    $19.81

    Trane SWT02173 manual reset limit switch, opens at 310°F. Teardrop mount. Used as a flame rollout safety switch on Trane and American Standard furnaces.

  • Low StockSWT04232 - DUAL PRESSURE SWITCH (-0.17 -0.50)
    TRANE

    SWT04232 – DUAL PRESSURE SWITCH (-0.17″ & -0.50″)

    SKU · SWT04232
    $122.79

    Trane SWT04232 dual furnace pressure switch, -0.17″ and -0.50″ WC. For two-stage Trane/American Standard furnaces. Also replaces SWT02357 and C340789P02.

  • Low StockTH198018 - THERMOCOUPLE (18)
    SUPCO

    TH198018 – THERMOCOUPLE (18″)

    SKU · THERMOCOUPLE18
    $15.28

    18-inch universal thermocouple for gas furnaces and water heaters. Stainless steel with universal adapter fittings. Fits most standing-pilot gas appliances.

  • In StockTH198024 - THERMOCOUPLE (24)
    SUPCO

    TH198024 – THERMOCOUPLE (24″)

    SKU · THERMOCOUPLE24
    $15.28

    24-inch universal thermocouple for gas furnaces and water heaters. Stainless steel with universal adapter fittings. Most common thermocouple length for residential systems.

Showing 168 of 168 parts
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