I have a heat pump with a ac unit. The condensation builds up in the coil area and will not drain out from the pipe? What is the problem this just started. And I'm selling my house. Help!

Check the AC units condensation drain, it is likely plugged. When an AC is running it dehumidifies the air as it passes through the evaporator core, this creates a lot of liquid water, it must be drained off.

I'm thinking that one is above exhaust pipe under firewall area..I believe its behind the silver heat shield..watch where the ac drip and go from there

Well...they are kinda the same. The condenser is where the refrigerant is condensed from a gas to a liquid. When in AC mode this happens outside at the AC unit. (You ever put your hand over a running AC unit in the summer? Feels warm!). When in Heat Pump mode the process is reversed. Instead of condensing the gas to liquid outside (which creates heat) the condensing happens inside and helps warm the building up (with the help of the fan of course). So essential the condenser is where the gas is condensed into a liquid, which creates heat. A heat pump can reverse the direction of the flow and cause this condensing to happen either outside or inside.
This is a very watered down version of what happens but I hope this is sufficient for what you are asking.

Tankless or hybrid water heater?

Tankless gas must have special fitting between water heater and vent that has a condensate line fitting. Hot toxic vent gasses traveling up vent pipe cause acidic water vapor to form inside vent pipe that drips back down vent and drips onto heat exchanger and other parts eventually burning hole through expensive metal alloy heat exchanger, rendering tankless computer water heater useless after electric circuitry gets wet and shorts out.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html#vent

Hybrid or heat pump type computer water heaters must have condensate drain connected to catch pan located just above storage tank and below compressor. Condensation can form on condenser coils and drip into catch pan where there is primary and secondary drain
http://waterheatertimer.org/Review-GE-Heat-Pump-water-heater.html#maintenance

Read product manual
Gene
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This unit - like all A/C units, produces condensatiopn when warm, humid air is passed through the cooling coil. Below the coil is a pan that is designed specifically to catch the condensate (water) droplets, and a drain opening that should have a pipe connected that carries the condensate outside.

You should check outside to make sure the drain pipe is not blocked. Next, check the inside of the indoor portion to make sure there is nothing blocking the drain opening in the pan. It is not unusual for spiders to set up in these cozy areas in the offseason.

You will need to consult the manual (if needed) to learn how to remove the cover for access to the pan. Be sure to unplug the unit / shut off the circuit before beginning any work.

Once you've cleared the line, the condensate should empty outside as it did before. Good luck!

The tray that holds the condensed water from the evaporator
may be clogged, it may be clogged before the cleanout hole,
where the tray joins the pvc, if this is the case you may have to
power down your ac unit, there is a panel on your heater unit
that you will have to access to expose the evaporator coils and
you will see the tray where the condensation builds up and flows
thru a pvc pipe to go outside. also make sure that the pipe going
outside is at a slope so that the condensation can flow and not
clog the pipe. make sure that water can flow from the tray thru
the cleanout hole. once you correct the problem. you need to reseal all the seams with duct tape or metalic tape, you can purchase at most hardware stores, to make sure their are no ac
cool air leaks other than thru your ac vents. good luck!

Hello, it sounds like your condensate line is clogged and not be able to drain into the condensate pump or your condensate pan is cracked and leaking. Best thing to do is clean the condensate line with a shop vac and see if the water will start to drain, if not looks like the pan is cracked.

Hello You should clean out the pipe/tube that drains into the pump.Try to disconnect it or find the end & blow or flush it out.

The condensate drain line is clogged, causing the condensation water to overflow. You can use a shop vac to clear the line. attatch it to the outlet side of the line. also clean out the condensate drain pan located at the bottom of the indoor coil.

Hello Cheryl, what they are talking about is a drain. As air conditioners run they collect moisture from the air on the evap(in cooling mode) or condenser ( in heat mode). This moisture will run off the part and flow into the tray. In the cooling mode, the moisture is slung onto the condenser to help cool it down, thus be more effective. I always recommend once a year remove the unit and clean all the coils and oil the fan motor. Household oil will work for this. During this cleaning find and clean out the drain. If it gets clogged that water can run back into the home. The PC pipe is sometimes attached to the unit to direct the water to a designated place. These units are common in hotels and they use the pipe to keep the water from dripping on the guest as they walk under the windows. Hope this helps.