Hi!!
It could be many things, the most common are Low R22 refrigerant, bad fan motor, bad compressor. obstructed condenser coil, bad starting relay, bad capacitor. among other things.
To check fan motor, set unit to HI Fan Only setting and let it run for a while, check that fan did not loose speed and it is not getting too hot.
If fan is OK, then turn unit to HI Cool 60-65 degrees and see what happens. Hear if compressor kicked in or if just made a humming noise and stopped. if this happens, replace capacitor.
Keep me posted!! Rate this post!!
SOURCE: fan cutting on and off every 5 mins
The only thing that is going to but the fan off is the thermostat. When the fan stops, immediately check the thermostat on the wall. See is there is power between the B terminal and the GH terminal. If none, then replace the thermostat. If there is, then replace the control board in the AC. That means that the fan relay on the printed circuit board is weak.
SOURCE: I have two ptac units, both want to run 5 or 6 mins. and cut off
Make sure there is nothing in front of the units, Chair, Couch ect, if you take the cover off the Units, you will see a little black Thermoster attached to the coil.
If the air bounces back off of something then it will cool that Thermoster and shut the unit down before the desired room temp is acualy reached.
Also make sure your Thermastat control knob is turned far enough to the right so that its asking for more cooling, Or desired temp.
Hope this helps.
Good Luck!
I’m happy to help further over the phone at https://www.6ya.com/expert/michael_341f3f9dee622e54
SOURCE: cut out with P5
P5 is possibly drain pump malfunction. check pump is working and also suction and exit lines are clear. Hope this helps -
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