Before replacing the board, count the LED blinks — the error code tells you what actually failed. Sometimes it’s a $15 fuse, not a $140 board.
16D74 – TIME DELAY RELAY (LENNOX)
$80.14
Lennox 16D74 time delay relay. 24 VAC input, 1-second delay on make, 45-second delay on break. OEM part for Lennox air handlers. Also listed as CT1S45.
Mon–Fri 10 am – 7 pm | Sat 10 am – 3 pm | In-Store Pickup Only
Description
If your Lennox air handler blower shuts off too quickly after the system cycles, or doesn’t start when it should, the time delay relay controls that timing. This relay keeps the blower running for 45 seconds after the compressor shuts down to push remaining conditioned air through the ducts.
Specs: 24 VAC input, 1-second delay on make, 45-second delay on break, OEM Lennox
Replaces: 13W12, 16D74, 19W66, CT1S45
Fits: Lennox: CBX26UH-030-230-1 and similar air handler models.
Need help? See our AC Clicking But Not Starting 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.
