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It must not be running very long when it runs?

First thing I would suspect is the limit switch - did the tech mess with it?
Maybe the low limit (where it shuts the blower off) somehow got...

Only 3 years old, it shouldn't have come close to going out yet, but - -

Those motors usually just have oilite bushings instead of ball bearings and when those bushings go dry the motor drags from...

You are correct, they are fairly easy to install. It likely is pretty much mounted "out front". Should be just 3 or 4 mounting bolts, the exhaust pipe connection, and a couple wires.

On mine,...

Look for information on the blower to see if there's a make or model # on it, then check online at the numerous discount HVAC suppliers and on eBay. When my inducer went bad a few years ago and...

Those fans just have oilite bushings (they run quieter than ball bearings) which eventually dry out and then the motor will start slowly and won't run fast enuf to create enough airflow and then the...

We've had our furnace for quite a long time and had to replace the draft inducer fan a couple years ago when it had about the same symptoms as you describe.

Those fans just have oilite bushings...

We've had our furnace for quite a long time and had to replace the draft inducer fan a couple years ago when it had about the same symptoms as you describe.

Those fans just have oilite bushings...

We've had our furnace for quite a long time and had to replace the draft inducer fan a couple years ago when it had about the same symptoms as you describe.

Those fans just have oilite bushings...

My furnace has a fusible link in the top of the burner airbox that's wired in series with the gas valve, meaning if this is open the control won't allow the gas valve to open. The fusible link will...

That would indicate that whatever controls the igniter function is not allowing voltage through the igniter.

There are a number of reasons that could be -
The pressure switches that check for...

I've had occasional failure to light problems for several years after we replaced our oem style igniters that burned out about every 2 years with another type from a local supply place (dealer had...

(Answering it myself) Researching (again) for troubleshooting ideas, I came across the new silicon nitride igniters that are not sensitive to i.e. fingerprint oils, frequent burnout, etc. Being we...

I have had intermittent igniter problems for several years, and had to replace the original style igniter every couple years. With more problems this morning I did some research and found out the...

On a Luxaire nat'l gas furnace with inducer fan & outside air intake, I've been struggling with occasional failure to light for several years. Worst when it got colder outside. Nobody could figure...

PBNU-LD20N100D Maybe 2 to 3 times a season it refuses to ignite. Gas valve is getting 24 volts from the control & clicks & passes gas at the prescribed time. Pressure switches all with proper...

Thanks for that info on the safety valve, will save for potential future problems. Never knew how to test them before.

Did find the problem. I work away from home for extended periods and when...

Model PBNU-LD2DN100D, 86k BTU output, external air intake, with White Rogers ignition control model 5OE47.

Have had problems in the past with partly blocked combustion air intakes or exhaust...

Model PBNU-LD2DN100D, 86k BTU output, external air intake, with White Rogers ignition control model 5OE47.

Have had problems in the past with partly blocked combustion air intakes or exhaust...