SHL515 – HIGH TEMPERATURE LIMIT SWITCH (3″, L200°)
$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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Showing 49–62 of 62 results
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SHL516 – HIGH TEMPERATURE LIMIT SWITCH (3″, L210°)
$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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SHL517 – HIGH TEMPERATURE LIMIT SWITCH (3″, L220°)
$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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SHL518 – HIGH TEMPERATURE LIMIT SWITCH (3″, L250°)
$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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SHL522 – HIGH TEMPERATURE LIMIT SWITCH (7″, L160°)
$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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SHL525 – HIGH TEMPERATURE LIMIT SWITCH (7″, L180°)
$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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SLS140 – AUTO LIMIT SWITCH (MICRO, L140°)
$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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SLS150 – AUTO LIMIT SWITCH (MICRO, L150°)
$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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SLS160 – AUTO LIMIT SWITCH (MICRO, L160°)
$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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SLS170 – AUTO LIMIT SWITCH (MICRO, L170°)
$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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SLS180 – AUTO LIMIT SWITCH (MICRO, L180°)
$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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SLS200 – AUTO LIMIT SWITCH (MICRO, L200°)
$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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SLS300 – AUTO LIMIT SWITCH (MICRO, L300°)
$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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SWT02173 – MANUAL LIMIT SWITCH (TEAR DROP, L310°)
$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.
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.
Not sure which part you need? Bring your old part to our Dallas store — our team will test it for free and help you find the right replacement.
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📞 (214) 340-9421Mon–Fri 10 am – 7 pm | Sat 10 am – 3 pm