Where can I purchase just the hose for my everstar portable AC unit?

it is 6 inches. try and measure your ac connector.
google everstar mpn1-095cr-bb6 portable ac exhaust hose

Drain hose or port may be clogged.
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They have a hose inside that could off undo the back and have a look.

What if you don't have the drain hose that came with it can you use any hose?

Here is a link to where you may be able to find the part(s) you need. Have your Model Number handy, when searching for the right window adapter or hose end.

http://www.appliancefactoryparts.com/airconditioners/everstar/everstar-other-parts.html

Hope this helped you and thanks for choosing FixYa>

Parts can be purchased on amazon, click here and take a look Amazon com everstar air conditioner. I hope this was helpful. Cheers

Make sure the exhaust hose isn't longer than the maximum allowed and is not kinked, turned too many times (bends) and is the right diameter as specified in the manual. It sounds like the unit is going off on high head pressure.

If at all possible, change the exhaust hose to a smooth type rather than the corrogated hose that probably came with the unit. The less air restriction in the exhaust the better.

Seal any air leaks at the exhaust or discharge point.

The everstar 10,000 BTU unit will require a dedicated 115 V 15 amp circuit. if there are other things pluged into outlets and running from the same breaker then the 15 amp breaker will trip. Or, these units also have a GFCI plug adapter. Be sure it has not been tripped due to an improperly grounded outlet, or wet location.

Your float switch is faulty, replace.

According to my Everstar manual, P-1 is a drainage problem.
EverStar owners manual pg. 16 -

1. Release the drain hose from the ruber clip and pull out the rubber plug, let the drain hose slant down to a water container.

2. Press the TURBO button on the unit control panel for more than 3 seconds and the WATER INDICATOR light begins flashing. It indicates the forced water drainage feature is activated.

3. Waiting until the WATER INDICATOR light stops flashing and there is no water flow.

4. After the water has drained, remember to secure the drain hose and plug in the upright position and clip it to the unit.

The unit will return to normal operation.

....I had to do this and it worked - Good luck!