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Final update, maybe. I ordered a fan from HVACDirect and got it installed today. Time will tell, but so far both the heat and cool cycles ran as expected. As nearly as I can tell, the new fan was OEM and identical to the original, and I got it to my door for $860. The local HVAC outfit wanted...

Thanks guys!! I'd seen the $7xx HVACDirect price, but was wary. Perhaps I shouldn't be. Since no one has addressed it, I'm assuming "programming" the speeds in these motors isn't a thing. Mark

They don't ask for serial number, but they do say it "fits" my furnace's model number. So long as it's not been installed, it is returnable. Of course, I'll have no idea if the fan speeds are correct without installing it, and even then only by sound. Overnight, Repair Clinic changed the status...

One more question... (Heard that from me before? :D ) For a given ECM fan SKU, the speeds associated with each wire are fixed, correct? IOW, they are not at all "programmable", so that if you need different speeds, you buy a different SKU, right? The AC fan speed has started failing more, and...

I need to look and see what, if anything, we have. I know we have a generator, but I suspect that's it. I keep our network stuff on a UPS so it stays up in the minute it takes the generator to restore power, but I never thought about protecting the HVAC stuff. :ROFLMAO: Mark

/\ Great post! Thanks!! Our ductwork in this 40+ year old house is what it is, but I can certainly do a better job keeping clean filters in it, and making sure the vents are open. Since I've demonstrated that the blue and yellow wires don't make the fan spin when voltage is applied and the fan...

Thanks guys!! Your answers are what I was expecting, which is reassuring. You are all spot on about residential HVAC outfits. I wouldn't be at all surprised to find that the "techs" have a commission component to their compensation. Certainly that's true of the first outfit we had out. As every...

And another little piece of me dies... The TL;DR is that I'm back where I was on the 17th, though the story may interest some. A couple of days after my last post, the AC fan failed to come on. (It came on later that day, and has failed one other time since.) I figured I'd just order a fan...

Thanks guys, I think... :ROFLMAO: My troubleshooting skills are decent, just from my professional background and hobbies, but knowing nothing about the subject at hand - like even just the rudiments of how furnaces work - tends to mitigate that some. You guys helped a ton with that, and taking...

I'm in a beach town in FL, so I'm not TOO worried about a blizzard at Christmas... :ROFLMAO: Seriously, both of your points are well taken. My credit card has been working like a farm animal the last few weeks, so I'll probably wait 'till after the holidays, but will get it in after that. If...

Well, the thing is "fixed", sort of. "Working" is a better description. One of the spare fan speeds didn't work, but the other one did, at a speed that seems appropriate for heat. It may be a little slow, just based on my memory of the fan noise from before, but heated the house up fine. The...

No worries. I actually have no interest in DIYing this, but I've learned that from auto repair to medicine, and everything in between, one better understand the problem before engaging "experts", as most of them are not. My foray this week into HVAC has not proven it to be an exception. Yeah, I...

Thanks!! Can I assume the motor controller (and relay?) are integral to the motor? I know the wires from the PCB go into the motor, and there are no components between them. It looks like the replacement for the motor I have is Carrier P/N HD 52MQ 131, which I can order for just over $1000...

I live in CO in the summer, and just got back to FL the other day. I wondered the same thing about the 24v, and whether the fan really runs on that. If there is a relay it's inside the fan motor. The leads from the motor to the circuit board are hard-wired. Someone asked for a schematic: Mark

It actually started failing last winter, this is just the week I'm trying to figure it out. Happy to hire a pro, but so far that's been four guys standing around shrugging, then presenting me with wildly overpriced things that "might fix it". Then a follow-up with a sales guy offering a $15k...

The other thing I tested was resistance between the speed leads on the fan to its common lead. I got 6ohms on the cooling lead (the speed that works), but open on heat and spare 1. I expected some positive number on at least the heat lead. What story does that tell, particularly in light of the...

I tested this morning, with unexpected results: With the Cool lead from the fan attached to the Heat terminal on the board, the terminal gets 24+v, but the fan still does not start. I attached one of the Spare leads from the fan to the same terminal, and the fan didn't start then, either. What...

Thanks guys! I'll have another look in the AM. Mark

Good call, man. In addition to Common, there are Heat, Cool and Fan terminals, in addition to two labeled Spare. Here's what the voltage measures across those to Common: Heat - 4v all the time, 26v when a call for heat is made, and the burners have been on for roughly 30 seconds. The fan does...

Not a problem, actually, but where? The heat output terminal on the circuit board (assuming I can identify it)? Mark