Can the inducer fan become "weak?"

[Rmgolob]

I have a Lennox G26Q3/4 - 100 - 1 furnace.
It was installed in 1998 +/-.
We purchased the house in 2012 so I only know history since.

2012 - late 2019: No problems at all.
About 2 months ago, the inducer fan was "gurgling" heat exchanger would not fire.
I used a leaf blower and blew out the water and it worked fine.
Then it happened again a week or so ago.
Since then - its happened 2/3 times and the time between failures is less each time.

I read elsewhere about incorrect installation and / or incorrect pitch of the pipes, but that is not likely the culprit as it worked for the last 7 years (if not the last 20 years.)

Any starting suggestions?

Pics below.

Thank you in advance.

 

[Plumber69]

If there is water in there you have an issue with venting or something else, came across this before.... I believe.

 

[Sponsor]

 

[Stuff]

Have you had the annual maintenance done? Part of it is to clean out the crud so everything drains.

 

[Rmgolob]

If there is water in there you have an issue with venting or something else, came across this before.... I believe.

Thank you.
Yes, its an issue with "something else."
When you came across this before, what were some of the other issues?

 

[Rmgolob]

Have you had the annual maintenance done? Part of it is to clean out the crud so everything drains.

Thank you.
I have not had annual maintenance done, but I can assure you crud and clogged lines is not an issue here.
Anything else?

 

[Stuff]

Thank you.
I have not had annual maintenance done, but I can assure you crud and clogged lines is not an issue here.
Anything else?

Gurgling means water is not draining and the prime cause is crud (algae or other stuff growing in the lines). The drain line is somewhat brown that indicates growth or age. Otherwise may be a pinched hose. Do you see water coming out of the condensate lines? If you have a pump do you hear it run once in a while?