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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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In-Store Pickup Only — Browse our catalog below, then visit us in Dallas or call (214) 340-9421 to purchase.

Showing 97–144 of 168 results

  • Low StockHK06WC069 - PRESSURE SWITCH (-0.27PF, 1176957)
    CARRIER

    HK06WC091 – PRESSURE SWITCH

    SKU · HK06WC091
    $73.80

    Furnace air-proving pressure switch from Carrier’s HK06WC family, the same series as HK06WC069 and HK06WC090, used in Carrier, Bryant and Payne gas furnaces.

  • Low StockHK61EA033 - RECTIFIER BOARD (1186788)
    CARRIER

    HK61EA033 – RECTIFIER BOARD (1186788)

    SKU · 1186788
    $52.72

    Carrier/Bryant/Payne rectifier board. Converts AC to DC for relay control in electric heat systems. OEM part HK61EA033, replaces older HK61EA003.

  • In StockHN61PC003 - RELAY (CARRIER, DC, 1172506)
    CARRIER

    HN61PC003 – RELAY (CARRIER, DC, 1172506)

    SKU · 1172506
    $43.82

    24V DPST relay with 30-amp capacity. OEM Carrier/Bryant/Payne part HN61PC003. Replaces older HN61PC002 and cross-reference T92S7D22-24.

  • In StockHS1P1S - HEAT SEQUENCER (SPST, Q101)
    SUPCO

    HS1P1S – HEAT SEQUENCER (SPST, Q101)

    SKU · NS101
    $27.35

    24V SPST heat sequencer (1 switch). Supco Q101. Basic single-stage sequencer for electric furnaces. Controls one heating element or blower.

  • In StockHS1P2S - HEAT SEQUENCER (SPST, Q102)
    SUPCO

    HS1P2S – HEAT SEQUENCER (SPST, Q102)

    SKU · NS102
    $28.40

    24V SPST heat sequencer (1 switch). Supco Q102. Longer delay timing than Q101. Controls one heating element or blower in electric furnaces.

  • In StockHS2P1S - HEAT SEQUENCER (DPDT, Q103)
    SUPCO

    HS2P1S – HEAT SEQUENCER (DPDT, Q103)

    SKU · Q103
    $29.45

    24V DPDT heat sequencer (2 switches). Supco Q103. Controls a heating element and a blower motor on timed delays. Replaces 24A34-3.

  • In StockHS2P2S - HEAT SEQUENCER (DPDT, Q104)
    SUPCO

    HS2P2S – HEAT SEQUENCER (DPDT, Q104)

    SKU · Q104
    $29.45

    24V DPDT heat sequencer (2 switches). Supco Q104. Different delay timing than Q103. Replaces HS24A344, Emerson E143, and NS104.

  • In StockHS3P1S - HEAT SEQUENCER (HS24A345, DPST-SPST)
    PACKARD

    HS3P1S – HEAT SEQUENCER (HS24A345, DPST-SPST)

    SKU · Q105
    $41.81

    24V heat sequencer with 1 DPST and 1 SPST relay in series. Handles up to 25 amps. Replaces Nordyne 621678 and HS24A345. Common electric furnace part.

  • In StockHS4P1S - HEAT SEQUENCER (HS24A346, 2 DPDT)
    PACKARD

    HS4P1S – HEAT SEQUENCER (HS24A346, 2 DPDT)

    SKU · Q106
    $42.40

    24V heat sequencer with two DPDT relays in series. Handles up to 25 amps. Replaces HS24A346. For electric furnaces with multi-stage heating elements.

  • Low StockSupco L593BA - ADJUSTABLE HIGH LIMIT SWITCH (3 in , 120-250)
    SUPCO

    L593BA – ADJUSTABLE HIGH LIMIT SWITCH (3″, 120-250)

    SKU · L593BA
    $57.35

    Universal replacement high-limit control from SUPCO’s CAMSTAT L59 series, with a 3 in bimetal element extension.

  • Low StockSupco L597BA - ADJUSTABLE HIGH LIMIT SWITCH (7 in , 120-250)
    SUPCO

    L597BA – ADJUSTABLE HIGH LIMIT SWITCH (7″, 120-250)

    SKU · L597BA
    $47.00

    Universal replacement high-limit control from SUPCO’s CAMSTAT L59 series, with a 7 in bimetal element extension.

  • In StockLH680534 - FLAME SENSOR (CARRIER, AFTERMARKET, DIRECT, FLS014)
    SUPCO

    LH680534 – FLAME SENSOR (CARRIER, AFTERMARKET, DIRECT, FLS014)

    SKU · FLS014
    $23.44

    Carrier flame sensor replacement (LH680534). Aftermarket direct fit with 73-degree bend and Kanthal rod. Replaces LH33WZ515, LH33WZ517, LH33WZ521, and more.

  • Low StockMAL250 - LIMIT SWITCH
    UNIVERSAL

    MAL250 – LIMIT SWITCH

    SKU · L250
    $20.71

    Furnace high-limit switch from the MAL series. A limit is a safety control: its normally closed contacts open to shut down the heating circuit when plenum temperature climbs past the set point.

  • In Stock47-22861-03 - LIMIT SWITCH (RHEEM, MICRO, WIDE MOUNT, L250°)
    UNIVERSAL

    MAL275 – LIMIT SWITCH

    SKU · L275
    $20.71

    Furnace high-limit switch from the MAL series. A limit is a safety control: its normally closed contacts open to shut down the heating circuit when plenum temperature climbs past the set point.

  • In StockMML130 - MANUAL LIMIT SWITCH (130°)
    PACKARD

    MML130 – MANUAL LIMIT SWITCH (MICRO, 130°)

    SKU · PRL130
    $14.97

    Manual reset micro limit switch, opens at 130°F. Push-button reset after trip. Universal replacement for Supco SRL130 and Packard PRL130. Used in furnaces and heaters.

  • In StockMML135 - MANUAL LIMIT SWITCH (135°)
    PACKARD

    MML135 – MANUAL LIMIT SWITCH (MICRO, 135°)

    SKU · PRL135
    $14.97

    Manual reset micro limit switch, opens at 135°F. Push-button reset after trip. Universal replacement for Supco SRL135 and Packard PRL135. Common in furnaces and unit heaters.

  • In StockMML220 - MANUAL LIMIT SWITCH (220°)
    PACKARD

    MML220 – MANUAL LIMIT SWITCH (MICRO, 220°)

    SKU · PRL220
    $14.97

    Manual reset micro limit switch, opens at 220°F. Push-button reset after trip. Universal replacement — fits most furnaces and heaters using a micro-base L220 switch.

  • In StockMML230 - MANUAL LIMIT SWITCH (230°)
    PACKARD

    MML230 – MANUAL LIMIT SWITCH (MICRO, 230°)

    SKU · PRL230
    $14.97

    Manual reset micro limit switch, opens at 230°F. Push-button reset after trip. Universal replacement for Supco SRL230 and Packard PRL130. Fits most residential furnaces.

  • In StockMML240 - MANUAL LIMIT SWITCH (240°)
    PACKARD

    MML240 – MANUAL LIMIT SWITCH (MICRO, 240°)

    SKU · PRL240
    $14.97

    Manual reset micro limit switch, opens at 240°F. Push-button reset after trip. Universal replacement for Supco SRL240 and Packard PRL240. Fits most furnaces and heaters.

  • In StockMML250 - MANUAL LIMIT SWITCH (250°)
    PACKARD

    MML250 – MANUAL LIMIT SWITCH (MICRO, 250°)

    SKU · PRL250
    $14.97

    Manual reset micro limit switch, opens at 250°F. Push-button reset after trip. Replaces Supco SRL250 and Packard PRL250. Universal fit for furnaces and unit heaters.

  • In StockMML260 - MANUAL LIMIT SWITCH (260°)
    PACKARD

    MML260 – MANUAL LIMIT SWITCH (MICRO, 260°)

    SKU · PRL260
    $14.97

    Manual reset micro limit switch, opens at 260°F. Push-button reset after trip. Replaces Supco SRL260 and Packard PRL260. Universal fit for residential furnaces.

  • In StockMML300 - ROLLOUT LIMIT SWITCH (MICRO, MANUAL, L300)
    GOODMAN

    MML300 – MANUAL LIMIT SWITCH (MICRO, L300°)

    SKU · PRL300
    $16.26

    Manual reset micro rollout limit switch, opens at 300°F. Crosses to Goodman B1370145 and York S1-026-34027-000. Fits Goodman, Amana, and York furnaces.

  • In StockMML350 - MANUAL LIMIT SWITCH (350°)
    PACKARD

    MML350 – MANUAL LIMIT SWITCH (MICRO, L350°)

    SKU · PRL350
    $14.97

    Manual reset micro limit switch, opens at 350°F. Commonly used as a flame rollout switch. Replaces 47-22861-01, B1370154, SRL350. Fits Goodman/Rheem furnaces.

  • In StockPFS097 - FLAME SENSOR (LENNOX)
    LENNOX

    PFS097 – FLAME SENSOR (LENNOX, 28M97)

    SKU · PFS097
    $22.60

    Lennox 28M97 flame sensor replacement. Aftermarket direct fit for Lennox, Armstrong, and Ducane furnaces. Single-prong design with ceramic insulator.

  • In StockPR1922 - RELAY (DC)
    CARRIER

    PR1922 – RELAY (DC)

    SKU · PR1922
    $29.33

    22V DC SPST relay for electric heaters in ICP/Heil/Tempstar units. Rated 30A at 28V DC and 40A at 277V AC. Direct replacement for ICP furnaces.

  • Low StockPS000 - PRESSURE SWITCH
    CLEVELAND CONTROLS

    PS000 – PRESSURE SWITCH

    SKU · PS000
    $45.27

    Cleveland Controls field-adjustable air pressure sensing switch kit. It proves draft or combustion-air flow before the control will allow ignition, and it can sense positive, negative or differential pressure.

  • In Stock42-22692-06 - DOOR INTERLOCK SWITCH (RHEEM, YORK)
    UNIVERSAL

    RA901 – DOOR INTERLOCK SWITCH

    SKU · RA901
    $18.00

    Universal blower-door interlock switch. Mounted at the blower compartment door, its plunger keeps the circuit made only while the panel is in place, so pulling the door de-energizes the furnace or air handler.

  • In StockS1-02435271000 - FURNACE PRESSURE SWITCH (-0.50PF)
    SOURCE1

    S1-02435271000 – FURNACE PRESSURE SWITCH (-0.50PF)

    SKU · S1-02435271000
    $64.70

    York S1-02435271000 furnace pressure switch, -0.50″ WC. OEM for York, Coleman, and Luxaire furnaces. Replaces 024-27576-000, 49L91, and C341750P01.

  • Low StockS1-025-35362-000 - LIMIT SWITCH (3, L200, ODD BASE)
    SOURCE1

    S1-025-35362-000 – LIMIT SWITCH (3″, L200°, ODD BASE)

    SKU · S1-02535362000
    $89.00

    York S1-025-35362-000 auto reset limit switch, opens at 200°F, closes at 170°F. 3-inch insertion, odd base. OEM for York furnaces.

  • Low Stock47-22861-03 - LIMIT SWITCH (RHEEM, MICRO, WIDE MOUNT, L250°)
    SOURCE1

    S1-02526366009 – LIMIT SWITCH

    SKU · 203589
    $54.39

    York / Coleman / Evcon OEM limit switch. Johnson Controls does not publish public specification sheets or cross-references for its York and Source 1 service parts, so no temperature rating, set point or amperage is listed here.

  • In StockS1-02527773700 - FLAME SENSOR (YORK, AFTERMARKET DIRECT, FLS700)
    SUPCO

    S1-02527773700 – FLAME SENSOR (YORK, AFTERMARKET, DIRECT, FLS700)

    SKU · FLS700
    $23.44

    York flame sensor replacement (S1-02527773700). Aftermarket direct fit with 4-inch probe and Kanthal rod. Fits York, Coleman, and Luxaire furnaces.

  • Low StockS1-02530801000 - FLAME SENSOR (YORK)
    YORK

    S1-02530801000 – FLAME SENSOR (YORK)

    SKU · S1-02530801000
    $61.56

    York S1-02530801000 OEM flame sensor for York, Coleman, and Luxaire furnaces. Factory original part with ceramic insulator and stainless rod.

  • Low StockS1-02532606000 - LIMIT SWITCH (3, ODD BASE, L210°)
    SOURCE1

    S1-02532606000 – LIMIT SWITCH (3″, ODD BASE, L210°)

    SKU · S1-02532606000
    $45.04

    York S1-02532606000 high limit switch, 3-inch insertion, odd base, opens at 210°F, closes at 180°F. OEM auto-reset limit for York furnaces.

  • Low StockS1-2702-311P - FLAME SENSOR (YORK)
    SOURCE1

    S1-2702-311P – FLAME SENSOR (YORK)

    SKU · S1-2702-311P
    $43.15

    York / Coleman / Evcon OEM flame sensor. Johnson Controls does not publish public specification sheets or cross-references for its York and Source 1 service parts, so no temperature rating, set point or amperage is listed here.

  • Low StockS1-32435972000 - PRESSURE SWITCH (-0.10PR)
    SOURCE1

    S1-32435972000 – PRESSURE SWITCH (-0.10PR)

    SKU · NS2-1604-00
    $52.49

    York S1-32435972000 furnace pressure switch, -0.10″ WC. OEM replacement for York, Coleman, and Luxaire furnaces. Also replaces 024-27666-000 and NS2-1604-00.

  • Low StockS1-7670-3531 - DOOR SWITCH (OBSOLETE, NO REPLACEMENT)
    SOURCE1

    S1-7670-3531 – DOOR SWITCH (OBSOLETE, NO REPLACEMENT)

    SKU · S1-7670-3531
    $21.48

    York / Coleman / Evcon OEM door interlock switch. Johnson Controls does not publish public specification sheets or cross-references for its York and Source 1 service parts, so no temperature rating, set point or amperage is listed here.

  • In StockHVAC flame sensor replacement part
    TRANE

    SEN01114 – FLAME SENSOR (TRANE)

    SKU · SEN01114
    $22.12

    Trane flame sensor, direct OEM replacement. Fits multiple Trane/American Standard furnace models. Replaces SEN0337, SEN0441, SEN0491. Stainless steel rod with ceramic insulator.

  • In StockSHL508 - HIGH TEMPERATURE LIMIT SWITCH (3, L190°)
    SUPCO

    SHL508 – HIGH TEMPERATURE LIMIT SWITCH (3″, L190°)

    SKU · SHL508
    $35.14

    Supco SHL508 high limit switch, 3-inch insertion, opens at 190°F, closes at 170°F. Auto reset. Crosses to Carrier HH12ZB190 and Trane SWT01259.

  • Low StockSHL509 - HIGH TEMPERATURE LIMIT SWITCH (3, L240°)
    SUPCO

    SHL509 – HIGH TEMPERATURE LIMIT SWITCH (3″, L240°)

    SKU · SHL509
    $35.14

    Supco SHL509 high limit switch, 3-inch insertion, opens at 240°F, closes at 210°F. Auto reset. Crosses to Carrier HH12ZB240. Universal furnace replacement.

  • In StockSHL513 - HIGH TEMPERATURE LIMIT SWITCH (3, L170°)
    SUPCO

    SHL513 – HIGH TEMPERATURE LIMIT SWITCH (3″, L170°)

    SKU · HH12ZB170
    $35.14

    Supco SHL513 high limit switch, 3-inch insertion, opens at 170°F, closes at 130°F. Auto reset. Crosses to Carrier HH12ZB170. Universal furnace fit.

  • In StockSHL514 - HIGH TEMPERATURE LIMIT SWITCH (3, L180°)
    SUPCO

    SHL514 – HIGH TEMPERATURE LIMIT SWITCH (3″, L180°)

    SKU · SHL514
    $35.14

    Supco SHL514 high limit switch, 3-inch insertion, opens at 180°F, closes at 140°F. Auto reset. Crosses to Carrier HH12ZB180. Universal furnace replacement.

  • In StockSHL515 - HIGH TEMPERATURE LIMIT SWITCH (3, L200°)
    SUPCO

    SHL515 – HIGH TEMPERATURE LIMIT SWITCH (3″, L200°)

    SKU · SHL515
    $35.14

    Supco SHL515 high limit switch, 3-inch insertion, opens at 200°F, closes at 160°F. Auto reset. Crosses to Carrier HH12ZB200. Universal furnace replacement.

  • In Stock47-102473-04 - HIGH LIMIT SWITCH (L210°, 3)
    SUPCO

    SHL516 – HIGH TEMPERATURE LIMIT SWITCH (3″, L210°)

    SKU · SHL516
    $35.02

    Supco SHL516 high limit switch, 3-inch insertion, opens at 210°F, closes at 170°F. Auto reset. Crosses to Carrier HH12ZB210, Rheem 47-102473-04, and more.

  • Low StockSHL517 - HIGH TEMPERATURE LIMIT SWITCH (3, L220°)
    SUPCO

    SHL517 – HIGH TEMPERATURE LIMIT SWITCH (3″, L220°)

    SKU · HH12ZB220
    $35.14

    Supco SHL517 high limit switch, 3-inch insertion, opens at 220°F, closes at 180°F. Auto reset. Crosses to Carrier HH12ZB220 and Lennox 29M75.

  • Low StockSHL518 - HIGH TEMPERATURE LIMIT SWITCH (3, L250°)
    SUPCO

    SHL518 – HIGH TEMPERATURE LIMIT SWITCH (3″, L250°)

    SKU · SHL518
    $35.14

    Supco SHL518 high limit switch, 3-inch insertion, opens at 250°F, closes at 210°F. Auto reset. Crosses to Carrier HH12ZB250. Universal furnace replacement.

  • Low StockSHL522 - HIGH TEMPERATURE LIMIT SWITCH (7, L160°)
    SUPCO

    SHL522 – HIGH TEMPERATURE LIMIT SWITCH (7″, L160°)

    SKU · SHL522
    $35.14

    Supco SHL522 high limit switch, 7-inch insertion, opens at 160°F, closes at 140°F. Auto reset. Crosses to Goodman B1370908/B13709-08. Direct Goodman replacement.

  • In StockSHL525 - HIGH TEMPERATURE LIMIT SWITCH (7, L180°)
    SUPCO

    SHL525 – HIGH TEMPERATURE LIMIT SWITCH (7″, L180°)

    SKU · SHL525
    $35.14

    Supco SHL525 high limit switch, 7-inch insertion, opens at 180°F, closes at 160°F. Auto reset. Universal 7-inch probe replacement for furnaces.

  • Low StockSHP425300 - REFRIGERANT HIGH PRESSURE SWITCH (OPEN @ 425 PSI)
    SUPCO

    SHP425300 – REFRIGERANT HIGH PRESSURE SWITCH (OPEN @ 425 PSI)

    SKU · PHP425300
    $32.05

    Supco high-pressure switch — opens at 425 PSI, closes at 300 PSI. 1/4″ SAE flare fitting, auto-reset. Protects compressor from high head pressure.

Showing 144 of 168 parts
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