If your furnace is short-cycling, check the filter first — a clogged filter causes the limit switch to trip. If the filter is clean, then the switch itself may be failing.
HH18HA507 – AUTO LIMIT SWITCH (MICRO, LARGE BASE, 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.
Mon–Fri 10 am – 7 pm | Sat 10 am – 3 pm | In-Store Pickup Only
Description
If your furnace is short-cycling (turning on and off repeatedly), a failed limit switch may be the cause. This Carrier OEM auto-reset switch opens at 185°F and closes at 145°F. No manual button — it resets itself once temperatures drop.
Specs: Opens at 185°F, closes at 145°F, auto reset, micro size with large base, SPST
Replaces: HH18HA185, HH18HA507
Fits: Carrier, Bryant, and Payne furnaces calling for HH18HA507 or HH18HA185. Bring your model number — we’ll verify.
Need help? See our Furnace Short Cycling Guide.
In stock at Open To Public HVAC Parts in Dallas. We test parts at the counter before you buy. Call or text (214) 340-9421.
