Coffee only pours a half a pot at a time when I

Airport or AirPot?

Normally whomever supplies your coffee has a service to do minor repairs free of charge.

https://www.google.com/search?q=R%2FO+plumbed+line+double+airport+brewer

Please always include FULL make and Model. All questions like yours can be answered by Google.

make model inconsistent brewing water levels (or similar query)

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You should contact Bloomfield to find your local Bloomfield Service vendor. You will need them for parts and/or service.
*** the following is for information only as all repairs should be performed by a qualified tech.***

The start switch activates the timer (analog or digital) board which turns on the water feed to the brew tank. This forces previously heated water out and sprayed over the ground coffee in the brew funnel. Coffee then drips into the decanter.
* But since the water line was not connected then the buzzing sound is just the valve opening.
* This brewer has a tank that needs to be filled PRIOR to powering up as the heater element usually turns on as soon as it's plugged in. The thermal fuse(s) will blow if tank is not filled. Once filled and powered up. Wait 20 mins then set up a coffee funnel and decanter. Slowly pour in 1 pot of water into the top opening. Do Not splash or over fill! Water should come out of the funnel and fill the pot (full). If it's not hot then the element is not working and this unit will need service.
* Check if there is an on/off heater switch on the back or side. (some are 'Vacation' switch) Turn on and wait 20 mins for another pour over brew. If it still does not heat then the limit fuse(s) are blown.
* Check the on/off switch. Most models will light up when switched on.
* Check the timer. Digital timers tend to be sensitive to electrical storms. Analog timers have a dial and are more tolerant of electrical surges.
* If you do get a good heated brew then continue to use as a pour over or hook up the water line to the brewer. (usually a 1/4" copper line with a flare or compression fitting.)
* Check the water fill solenoid. Should be a definite click when activated. Water filling sound should be very clear.
* No water flow then check the water supply line if it's on.
* Final; this brewer needs service. Call your coffee vendor for advice.
Aloha, ukboy57

I will assume that it is a pour over brewer from your statement, so the only thing that comes to mind is the thermostat not turning off the elements and the water is boiling and coming out the brew tube. You can try to adjust the thermostat first if that does not help then you might have to replace it.

No setup to it. If it is a pourover, add 3 pots of waterto the pour in funnel at the top. keep a pot under the brew funnel, The tank will hold about 2 and a half pots of water. From then on what you pour in is what will come out. If you have an automatic model, it would require a water line hook up and after 2 cycles water will frow from the brew funnel after that, let the machine heat up for 20 minutes and brew coffee like you would at home.

If you pour water into the machine, and water comes out, then the reservoir is full of water. There is no way the water can bypass the reservoir and go directly into the pot.

Check the in line water fliter. It may need to be changed.

You can try this also.

Put the brew basket in place with no coffee in it, put an empty decanter under the basket. take a full decanter and pour it in the water fill screen at the top of the unit. When the wtaer stops dripping and the unit is back up to temp, try a full brew cycle.

If it works OK, it just got low on water in the tank

Could be caused by a plugged up filter or lime scale build up.

Hi, Get 2 pots place one under the spray head with the filter cone in....now fill the other coffee pot and start to pour water through the lid top front...keep pouring water through (about two and a half pots) until water starts to pour through the cone....now the tank is full plug her in and turn on the power switch at the back and also the front if there is one....place filter in cone..put coffee in filter...pot on burner...wait about 25 minutes until water in tank is hot...when light on front comes on pour another pot of cold water through the top and you will get a pot of hot coffee in bottom....I also think this machine can be hard wired into water main....get plummer to hook up...follow same procedure but instead of pouring water through top for coffee..hit brew switch. if it poors too much of too little you will find a timer in the machine you can adjust to allow more or less water...hope this helps.

There is a one and a half gallon holding tank inside this coffee maker, you can maybe brew 2 pots one after the other but then you need to give it time to recover. When you pour hot water in it pushes hot water from the holding tank out the spray head...hope that helps :)

Is this problem happening by chance after you have used the maker? If so the heat from the previous use may be causing the water to steam from being so hot and thus causing the pot to be only half full. the hotter the maker the more water evaporates. You might need to let it cool down in between pots.

Joe

These macines have an internal water heater that should be clened periodicly (monthly per manufacturers instructions but I do it quarterly/semianually/when it gets noisy :) ). The machine will have to be disasembled to do this since the tank will have to be flushed when you do this to get the chemicals out of it (vs running a pot of vinegar through your Mr. Coffee machine at home), Depending on how much scale has built up in the tank this could take several cleaninings. Scale deposits can over time impair/damage the heater or thermostat but replacement parts are cheaper than a new machine and the machine will outlast and outperform a standard coffee maker. BTW, my 8572 3 burner was built in 1972, I bought it at a flee market for $25 10 years ago put $100 in parts to get the push to brew and hot water on tap working again and it made two great pots of coffee this morning.