HVAC Guys: What is this and how bad is it??

[HoneyBadger]

Woke up this morning and noticed the furnace had water all around it. When I saw it, there was about 20oz of water on the floor. I'm not sure if any of it or how much actually went down the drain, but apparently my builder did a crappy job of sloping the floor to drain water here.
Here's what I know:
-The water is definitely coming from the furnace (not the hot water heater).
-The humidifier is dry as a bone (only runs when heat is on, heat hasn't been on in months).
-It's not coming from the intake/exhaust pipes.
-Nothing elevated off the floor is wet. None of the inside or outside walls of the furnace are wet (as far as I can tell).
-It rained a decent amount last night, but nothing more than we have been getting any other day here lately.
-It is definitely water.
-The source of the water doesn't seem to still be leaking/draining/pissing.

Pics: (If there are more helpful pics I could take, please let me know and I'll go take them)

The original water line didn't cross the blue tape lines. There were some things there that I had to drag out of the way.

[jslo]

Coil is iced up. If you go outside you'll probably find the compressor and line set iced up also. Air restriction or low on freon.

[HoneyBadger]

Could it be because the A/C was running when it was relatively cool outside last night?

[newracer]

Have you changed your filter lately?

[HoneyBadger]

Yeah, I change it about every 3 weeks because the furnace is a POS "high efficiency" furnace that won't work with a real filter... I have to use the cheapo green ones and I do my best to change them frequently.

FWIW, the condenser outside was relatively dry with no ice, but it is 60* outside now and I don't know how much it rained last night. A/C was probably running from 7-10pm last night.


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Edit: You're probably talking about the coil inside the stack, right? Is there a way i can peek inside there without cutting the damn thing open?

Thanks for the quick responses, guys.

[jslo]

Use the cheapest filters for cooling (less restriction). Open all registers and clean out fins in the outside unit. Defrost inside coil by running fan for a couple hours.

[ChunkyMonkey]

..or sell your house to me for few grands. Time to move on. That house is done.

[HoneyBadger]

Use the cheapest filters for cooling (less restriction). Open all registers and clean out fins in the outside unit. Defrost inside coil by running fan for a couple hours.

I should mention that the house is only 2 years old. There is no measurable dust/dirt in the vents or ducts as far as I can tell. I think the coil is probably already defrosted (hence the lack of recent water leakage). How can I prevent this from happening again? Was I just running it while the outside temp was too low?

[HoneyBadger]

..or sell your house to me for few grands. Time to move on. That house is done.

Okay, no prob. $400k OBO.

ETA: will take kidneys in a partial trade.

[jslo]

If it is determined to be low on freon make sure who ever recharges it puts puts caps on the needle valves (if they're missing), they do leak. I just had my guy out to a customers house and all 3 units were missing the caps and all 3 were way low on charge.