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.
5D51-78 – FAN & LIMIT CONTROL (11″)
$167.57
Honeywell L4064B2210 fan and limit control with 11-inch element. Adjustable fan differential and fixed high-limit safety cutoff. For older furnaces without electronic controls.
Mon–Fri 10 am – 7 pm | Sat 10 am – 3 pm | In-Store Pickup Only
Description
If your furnace blower won’t kick on, runs constantly, or the furnace overheats and shuts down, the fan and limit control may be the problem. This combo control turns the blower on/off by temperature and provides high-limit safety. The 11-inch element is for furnaces needing a longer plenum reach.
Specs: 11-inch element, adjustable fan differential, fixed high-limit cutoff, Honeywell L4064B series
Replaces: 5D51-78, L4064B2210
Fits: Older gas furnaces using a Honeywell L4064B fan and limit control with an 11-inch element.
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.
