16D74 – TIME DELAY RELAY (LENNOX)
Not sure this is the right one? Bring the old part or a photo of the data plate to the counter and we will match it with you - no account, no appointment, no minimums.
10226 Plano Rd, Suite 104, Dallas TX 75238
Questions? Call or text (214) 340-9421
Mon–Fri 10 am – 7 pm | Sat 10 am – 3 pm
Symptoms of failure
- No response at all when the thermostat calls
- Board LED flashes a fault code, or shows nothing
- Blower or inducer runs constantly and will not stop
- Visible scorch marks, a blown fuse or a bulged capacitor on the board
- Furnace works intermittently with no pattern
- Relays on the board click but nothing downstream energizes
Seeing these does not always mean this part is the culprit. Bring the old one in and we will meter it at the counter, free, before you buy.
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.
Specs
- TypeAir Handler - Electric
- DetailLENNOX
Installing it yourself
- Power off at the furnace switch and confirm 0V.
- Photograph EVERY connector before you unplug anything. This is the step people skip and regret.
- Check the obvious first - a blown 3A fuse, a tripped rollout, a bad ground. Most boards that get replaced were not the problem.
- Unplug connectors one at a time and move them to the new board as you go.
- If you are fitting a universal board, the harness and the DIP switch settings are part of the job - those switches set the safety timings.
- Match the flash-code chart on the new board's label, not the old one. Codes are not standardised between brands.
- Restore power and watch a full heat cycle end to end before closing up.
- We do not run full diagnostics on boards at the counter, but bring the furnace model and the flash code and we will help you work out whether the board is really the failure.
Power off at the disconnect first, every time. Not sure partway through? Bring it to the counter and we will walk it with you.
Cross-reference numbers
This part replaces the following OEM and aftermarket numbers:
- 13W12
- 16D74
- 19W66
Not sure if your number matches? Call (214) 340-9421 or bring the old part in — bench-testing is free.
Fits these models
- CBX26UH-030-230-1
Do I need an account to buy from you?
No. No account, no appointment, no minimums, and no contractor licence required. We have been open to the public in Dallas since 1998.
Do you ship?
No. Everything is sold in person at the counter - 10226 Plano Rd, Suite 104, Dallas TX 75238.
Can you help me work out what I need?
That is what the counter is for. Bring the old part, or a photo of the data plate, and we will work through it with you.
Do you test parts?
We meter capacitors, contactors, motors, ignitors, relays and transformers free at the counter, whether or not you buy from us.
What are your hours?
Monday to Friday 10am to 7pm, Saturday 10am to 3pm.
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