The unit has quit cooling. The compressor does not seem to be coming on.

Please reply with Model number of bottom of AC unit ( upper) . Can be seen from inside usually. Thermostat model, plus if controls are at the ceiling assy or at thermostat on wall.

Any error codes? If not there may be a mechanical fault with the compressor/inverter. The unit is possibly short on refrigerant, so the compressor is not getting enough suction cooling from return gas, so may be clicking off on its internal over temp klixon.

all the best

PTAC temp drop should be 20 to 25 degrees across the coil. They never put a service tap on these units. I sell Amana PTACs. You may be alittle low on gas. Check your air TD and that will tell you. The compressor may be overheating due to lack of cool gas to cool the comp. May need a service tech but get a free estimate first. Rus

t seems like there is a problem with the thermosat, or the compressor. Its not sensing the temperature being to warm to kick the compressor on and cool it down. OR the compressor itself id dead. Hope I could help.

Wayne

Check outside unit capacitor and the contactor.. I work on Goodman unit sounds like a cap or contactor

SOUNDS LIKE ITS LOCKED OUT ON LOW LIMIT OVERLOAD CHARGE THE AC SHOULD START UP WHEN COMPRESSOR GETS AMPLE FREON

You hear the compressor kick in (Hum) but no fan comes on? Will the fan come on when just in fan mode, not cool, or do you have that set-up?

just replace the fan ..... its seems there is some voltage problem

The Air conditioner are good only the adjustment of thermostat are the problem, select the thermostat in lower #3 you observe the thermostat will off in such time temperature reach to #3 If you full adjustment the compressor will not off.
In fan selector the compressor will autamatic off because no connection attached fan only .

Check if the condensar ( outside fan unit) is getting enough free ventilation. IF there is no free air flow you will mostlikely be triping the unit due to short cycling. Ie the unit is pulling its own discherge air causing the compressor to trip due to high back pressure