So the unit is roughly a year old. GMS920804N Horizontal/Upflow. I believe this is the model but I'm not certain because I'm not at home to verify. The unit was in place when we bought the home about 5 months ago.

We are only just now attempting to use the furnace for the first time since we moved it.

Here's the problem: I have 3 flashing LED's. I have the manual to tell me what's wrong but it's what I hear that's troubling me. The blower comes on during start up but I can HEAR water sloshing in the fan.

Here is what I've done but am willing to retry: I checked all of the drain tubes. Blew them out. Checked for plugging. Pulled what I thought was the drain tube off of the blower itself but still can't seem to get the water out. Best as I can tell the port between the drain tube and blower housing itself is not plugged. Verified by trying to rod it to no avail. I did find some condensate in the tubes between pressure switches but I've since drained them. Checked my trap and even placed water back in it to make a seal for vacuum. Full disclosure I know next to nothing about AC/heating. Shooting from the hip.

Recap: Essentially, just water in the blower that isn't draining which I think is the only thing locking out my furnace but I really don't know.

 

Welcome to the forums.

Three flashes is the pressure switch not proving. It could be water in the lines still and it can be a clogged line between the inducer and the pressure switch. Remove the small line and make sure it's clear as well as the small (TINY) opening on the inducer is clear.




Your manual.....
Starting on page 20 is the drain system connections based on installed orientation of the furnace.
ac direct/media/catalog/files/IO-244F.pdf

 

Thanks for the reply. I haven't had a chance to get on here in a few days. I'll give that a shot and take a look at the drain system. Who knows? Maybe when they installed it they did something wonky. I had just assumed when I pulled the lowest drain line that the remaining water would come pouring out.

 

The usual problem when the inducer fan is kicking up water is that the drain system is plugged with algae and/or other junk.

Usually the drain system can be disassembled and flushed with water to clean out the junk. Not too bad of a job in most cases.

 

So could that be the case in the blower itself? I've pulled every drain hose off and can't get the water to come out anywhere. I figured if a hose was plugged I could pull that and clean it but at least the water would still drain from the casing while I clean the hoses. That is not whats happening though.

 

You need to track the drainage system back to the inducer motor housing, and identify anything plugged along the way.

Usually that's not too hard to do.

 

Good news. Got the water out and the heater is kicking ass now. Thanks for the help!