HH18HA507 – AUTO LIMIT SWITCH (MICRO, LARGE BASE, L185°)
SKU · L185
$26.66
Carrier HH18HA507 auto reset limit switch, opens at 185°F, closes at 145°F. Large base, micro size. OEM replacement for Carrier, Bryant, and Payne furnaces.
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Showing 49–83 of 83 results
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Low StockSUPCO
L593BA – ADJUSTABLE HIGH LIMIT SWITCH (3″, 120-250)
SKU · L593BA$57.35Universal replacement high-limit control from SUPCO’s CAMSTAT L59 series, with a 3 in bimetal element extension.
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Low StockSUPCO
L597BA – ADJUSTABLE HIGH LIMIT SWITCH (7″, 120-250)
SKU · L597BA$47.00Universal replacement high-limit control from SUPCO’s CAMSTAT L59 series, with a 7 in bimetal element extension.
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Low StockUNIVERSAL
MAL250 – LIMIT SWITCH
SKU · L250$20.71Furnace 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.
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In StockUNIVERSAL
MAL275 – LIMIT SWITCH
SKU · L275$20.71Furnace 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.
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In StockPACKARD
MML130 – MANUAL LIMIT SWITCH (MICRO, 130°)
SKU · PRL130$14.97Manual 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.
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In StockPACKARD
MML135 – MANUAL LIMIT SWITCH (MICRO, 135°)
SKU · PRL135$14.97Manual 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.
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In StockPACKARD
MML220 – MANUAL LIMIT SWITCH (MICRO, 220°)
SKU · PRL220$14.97Manual 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.
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In StockPACKARD
MML230 – MANUAL LIMIT SWITCH (MICRO, 230°)
SKU · PRL230$14.97Manual 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.
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In StockPACKARD
MML240 – MANUAL LIMIT SWITCH (MICRO, 240°)
SKU · PRL240$14.97Manual 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.
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In StockPACKARD
MML250 – MANUAL LIMIT SWITCH (MICRO, 250°)
SKU · PRL250$14.97Manual 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.
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In StockPACKARD
MML260 – MANUAL LIMIT SWITCH (MICRO, 260°)
SKU · PRL260$14.97Manual reset micro limit switch, opens at 260°F. Push-button reset after trip. Replaces Supco SRL260 and Packard PRL260. Universal fit for residential furnaces.
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In StockGOODMAN
MML300 – MANUAL LIMIT SWITCH (MICRO, L300°)
SKU · PRL300$16.26Manual 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.
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In StockPACKARD
MML350 – MANUAL LIMIT SWITCH (MICRO, L350°)
SKU · PRL350$14.97Manual 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.
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Low StockSOURCE1
S1-025-35362-000 – LIMIT SWITCH (3″, L200°, ODD BASE)
SKU · S1-02535362000$89.00York 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.
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Low StockSOURCE1
S1-02526366009 – LIMIT SWITCH
SKU · 203589$54.39York / 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.
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Low StockSOURCE1
S1-02532606000 – LIMIT SWITCH (3″, ODD BASE, L210°)
SKU · S1-02532606000$45.04York 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.
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In StockSUPCO
SHL508 – HIGH TEMPERATURE LIMIT SWITCH (3″, L190°)
SKU · SHL508$35.14Supco SHL508 high limit switch, 3-inch insertion, opens at 190°F, closes at 170°F. Auto reset. Crosses to Carrier HH12ZB190 and Trane SWT01259.
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Low StockSUPCO
SHL509 – HIGH TEMPERATURE LIMIT SWITCH (3″, L240°)
SKU · SHL509$35.14Supco SHL509 high limit switch, 3-inch insertion, opens at 240°F, closes at 210°F. Auto reset. Crosses to Carrier HH12ZB240. Universal furnace replacement.
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In StockSUPCO
SHL513 – HIGH TEMPERATURE LIMIT SWITCH (3″, L170°)
SKU · HH12ZB170$35.14Supco SHL513 high limit switch, 3-inch insertion, opens at 170°F, closes at 130°F. Auto reset. Crosses to Carrier HH12ZB170. Universal furnace fit.
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In StockSUPCO
SHL514 – HIGH TEMPERATURE LIMIT SWITCH (3″, L180°)
SKU · SHL514$35.14Supco SHL514 high limit switch, 3-inch insertion, opens at 180°F, closes at 140°F. Auto reset. Crosses to Carrier HH12ZB180. Universal furnace replacement.
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In StockSUPCO
SHL515 – HIGH TEMPERATURE LIMIT SWITCH (3″, L200°)
SKU · SHL515$35.14Supco SHL515 high limit switch, 3-inch insertion, opens at 200°F, closes at 160°F. Auto reset. Crosses to Carrier HH12ZB200. Universal furnace replacement.
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In StockSUPCO
SHL516 – HIGH TEMPERATURE LIMIT SWITCH (3″, L210°)
SKU · SHL516$35.02Supco 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.
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Low StockSUPCO
SHL517 – HIGH TEMPERATURE LIMIT SWITCH (3″, L220°)
SKU · HH12ZB220$35.14Supco SHL517 high limit switch, 3-inch insertion, opens at 220°F, closes at 180°F. Auto reset. Crosses to Carrier HH12ZB220 and Lennox 29M75.
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Low StockSUPCO
SHL518 – HIGH TEMPERATURE LIMIT SWITCH (3″, L250°)
SKU · SHL518$35.14Supco SHL518 high limit switch, 3-inch insertion, opens at 250°F, closes at 210°F. Auto reset. Crosses to Carrier HH12ZB250. Universal furnace replacement.
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SUPCOSHL522 – HIGH TEMPERATURE LIMIT SWITCH (7″, L160°)
SKU · SHL522$35.14Supco 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.
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In StockSUPCO
SHL525 – HIGH TEMPERATURE LIMIT SWITCH (7″, L180°)
SKU · SHL525$35.14Supco SHL525 high limit switch, 7-inch insertion, opens at 180°F, closes at 160°F. Auto reset. Universal 7-inch probe replacement for furnaces.
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In StockSUPCO
SLS140 – AUTO LIMIT SWITCH (MICRO, L140°)
SKU · MAL140$15.01Supco 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.
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In StockSUPCO
SLS150 – AUTO LIMIT SWITCH (MICRO, L150°)
SKU · MAL150$15.01Supco 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.
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In StockSUPCO
SLS160 – AUTO LIMIT SWITCH (MICRO, L160°)
SKU · MAL160$15.01Supco 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.
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In StockSUPCO
SLS170 – AUTO LIMIT SWITCH (MICRO, L170°)
SKU · MAL170$15.01Supco 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.
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In StockSUPCO
SLS180 – AUTO LIMIT SWITCH (MICRO, L180°)
SKU · MAL180$15.01Supco 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.
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In StockSUPCO
SLS200 – AUTO LIMIT SWITCH (MICRO, L200°)
SKU · MAL200$15.01Supco 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.
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In StockSUPCO
SLS300 – AUTO LIMIT SWITCH (MICRO, L300°)
SKU · MAL300$15.25Supco 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.
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In StockTRANE
SWT02173 – MANUAL LIMIT SWITCH (TEAR DROP, L310°)
SKU · SWT02173$19.81Trane SWT02173 manual reset limit switch, opens at 310°F. Teardrop mount. Used as a flame rollout safety switch on Trane and American Standard furnaces.
Showing 83 of 83 parts
Signs You May Need a New Limit Switch
Limit switches are safety devices inside your furnace that monitor temperature. The high-limit switch shuts off burners if the heat exchanger gets too hot. The fan limit switch controls when the blower turns on and off.
Furnace Shuts Off Before Home Reaches Temperature▼
- The furnace lights and runs but shuts off after a few minutes.
- The high-limit switch may be tripping due to overheating.
- Common causes: dirty filter restricting airflow, failed blower motor, or a faulty switch.
Always check the air filter first. A clogged filter is the #1 reason a high-limit switch trips.
Blower Fan Won't Turn On or Won't Turn Off▼
- The furnace heats but the blower never starts to distribute warm air.
- Or the blower runs continuously and won't shut off after the heating cycle.
- The fan limit switch controls blower timing — when it fails, blower behavior becomes erratic.
Furnace Short-Cycles Repeatedly▼
- The furnace starts, runs for a few minutes, shuts off, then restarts.
- This continuous cycling often means the limit switch is tripping on high temperature.
- If the filter is clean and the blower is working, the limit switch itself may be faulty.
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