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Hello, if the airflow seems good and the unit is clean it is possible that the unit has a low refrigerant charge due to a leak, if you have a thermometer measure the return air and the supply air, tjen find the differance between the two, if it is below 15 then the unit is undercharged and will neec to be recharged.
Check and make sure the filter is clean. This sounds like a restriction in the system. If the unit has central cooling make sure ther indoor evaporator coil is clean at the furance.The unit may be cycling the burners on and off at the high heat limit , fan/limit control. You can also eliminate the thermostst from the furance. Turn power off at the furnace and disconnect the wiring from the thermostat. Jumper the red and white wire together. Turn the furnace back on. The furance should run in the heating mode. Try this and see if the problem is still there.
when is it the last time you cleaned the unit and changed the filters? it may be working good but you need to maintain the unit...clean all filters and see if you can vacum alll parts especially the condensing unit (you may need air pressure) can you move the unit to outside so you can clean it good? if you can use air or water pressur to clean it after you cover the lectrical parts. Good luck. (save your money this unit need cleaning only)
Check outside unit if unit and compressor are running feel the large line to see if it is cold. If compressor is running and line is not cold possible charge problems. You may have a capacitor problem outside. they go out quite often. You can change this yourself, Open up outside unit and the cap is the silver bullet with terminals out the top. Bad cap can cause compressor to not operate and also the fan. You need to clean the coil inside or at leat check the coil to see if it is clean. You can clean theis with a toilet brush do not go against the coil bit brush with the fins. You may need to call a service tech but try these options first. russ
This unit is use in motels etc. Check the ouside coil ( conderser) from the inside (discharge fan ) for dirt. Most of these units are floor level . This can cause a unit to short cycle ( cold air is at the floor) .
Sounds like the compressor is not running. This model had lots of problems with over heating. It also will never really blow more than a moderate cooling through it. Since you have cleaned all the filters and is still 100 deg, I believe the failure will be the compressor itself or the capacitor.
If you find an oily residue in the drain or on the pipes, it may have simply leaked the refrigerant out. Good Luck!