I have a seven year old Infinity Carrier Heat pump & I am having a problem with a condensate leak that is causing water to run all over the floor. The unit is in my hall closet. I have checked the drain & it is not stopped up, I cleaned the coils & poured water into the drip pan to clean it, all the pvc drain piping is clean. I don't think the drain pan is cracked...I don't know if I was supposed to do this, but I turned the air on while I had the front cover off to see if I could figure where the leak was coming from. I left the air on & running about 20 mins & it did not leak & the water ran out the drain pan drain line just fine. When I put the front cover back on it won't run out the drain line anymore & the water goes on the floor! What could be causing this? I'm puzzled! Thanks for any feedback on this. Kim

Low refrigerant levels (most common cause.)

it sounds like your outdoor unit is running, but the AC is blowing out hot air, start with cleaning the condenser coils. Spray the coils with a water hose, clearing away the loose dirt and foliage. If the AC continues to blow warm air, call an HVAC expert for help with refrigerant levels.

I WENT 50 YEARS NO A/C. EVEN AT 110F . EVEN 1 YEAR OLD.
LOTS OF CAUSES. IF TRUE.
BUT NOT ONE WORD OF PROOF IT IT DID
220F IS NORMAL AND AF DOES NOT BOIL UNTIL 255f.
SHOW PROOFS?
1: NOT RUNNING CLEAR MIX OF 50% AF IS TOP CAUSE
17 YEAR OLD COOLANT IS NEVER EVER GOOD
NOR RUNNING ONLY WATER NOT ALLOWED.
2 BAD RAD CAP , REPLACE IT,
3: COOLANT TOO LOW (EACH MORNING COLD , CAP OFF ALWAYS FULL.
4: BAD THERMOSTAT AGAIN 16 YEARS IS NO GOOD.
5: LEAKS COOLANT TO GROUND, INSIDE ENGINE OR TO PASSENGERS TOES (FOOT WELLS) IS BAD.
6: WATER PUMP BAD, RUSTED OUT IMPELLER.
7:FAN BELT LOOSE. SLIPS. TENSION-ER BAD.
8: BAD FANS, DEAD OR OLD AND SLOW.
OR SIMPLE STUFF THE CORES BOTH CONDENSER AND RAD ENGINE ARE PACKED UP IN BUG GUTS.
SO BLAST THEM OUT WITH WATER HOSE SPRAY NOZZLE.

OR GET THE CAR SERVICED IN A REAL SHOP.
THEY DO KNOW WHAT TO DO AND CHECK.

There are several questions that need to be answered about what type of system you have, but i found this posting that may help:
As your gas furnace runs, is there water leaking at the base? Is the furnace's air filter wet, too?There are a few things that could be happening here. But if you have a high-efficiency furnace, here's the most common cause: a condensation leak.
We'll explain why a furnace creates condensation, and what's causing it to leak out of your furnace.
Note: You'll know if you have a high-efficiency furnace if:

• The yellow energy guide tag says your furnace's efficiency is 90% or higher AFUE.
• The vent/flue pipe is white PVC as opposed to metal.

Why a high-efficiency furnace creates condensation
How in the heck does a high efficiency furnace create condensation/water anyway?
It's all about how the furnace extracts heat from combustion gases.
A lower-efficiency furnace extracts some heat from combustion gases and then quickly vents them out the flue pipe.
But a high-efficiency furnace, to extract more heat, has 2 heat exchangers. These allow the furnace to extract heat from the gases for a longer period of time. This causes the combustion gases to cool and then condense.
That condensation then exits out your home through a drain. But if that water is pooling around the furnace, there's a problem preventing it from draining properly.
Causes of a condensation leak around a high-efficiency furnace

• Clogged condensation tubing
• Clogged condensation drain
• Breaks in the condensation line
• Issues with the condensate pump (if you have one)

You'll need a furnace technician to diagnose which of these is the issue and then fix it.
Other causes of leaking water around a furnace
If you have a conventional, standard-efficiency furnace...then its flue pipe may be incorrectly sized.
If you have a whole-house humidifier connected to the furnace...there may be an issue which is causing the humidifier to leak into your furnace. Your humidifier should be getting annual maintenance from a professional to prevent this.

If the unit is running in cold weather than there is ice building up on the coils located outside. This is normal in that the unit is running in heat pump mode heating inside and cooling outside, After the unit detects the ice build up it briefly reverses the cycle heating the outside coils melting(defrosting) the ice which you observe as water on the pad.

The video gives you an example of the defrost cycle!
2012 Trane XL15i Heat Pump Defrost Cycle Steam Show

Messy - why not just hook up a regular fan and hook it up to the power line that ordinarily powers the condenser fan.and have it do the blowing until the repair person comes out on Friday. The ideal fan is one of those old floor fans that used to blow air in a 360 direction.

Could be several causes.
1. Blockage on piping
2. Water in inducer housing slowing down inducer impeller
3. Condensate trap for furnace clogged up.
4. Inducer motor going bad.
5. Leak in vacuum hoses or not connected.
Welcome To the Best HVAC

have your HVAC technician check the pressures in your unit...sounds like you may have low pressure. You should NOT be having any ice build up to melt off.

it sounds like coil may need leveled or drain cleaned out and if needed more refrigerant system has a leak and needs to be found and repaired. Is everything new (tubing,evaporator,and heat pump)?if so leak should be at a welded joint may be under insulation

It sounds like there is a leak in your system. The condensation tube is to drain off the water because one of the byproduct of combustion is water and it condenses on the heat exchanger. Since it is only 4 years old it might be under warrantee for this issue. The problem might be simple but could be very expensive if the heat exchanger has a leak.