My Infinity 9000 Ptac A/C unit displays F-1. What does this mean

You have a shorted unit. Check the compressors, condensing motors, and the indoor fan motor. Replace defective parts found from the unit.

That means evaporator coil is too cold, possibly iced, chech filters, fan speed, airflow, capillary tube

Hummm. A bit difficult to solve this problem. Seems like the condenser outside is not working, I mean the fan of the condenser. Looks like you have a wall A/C and a wall A/C always have condensers outside the house and near the A/C. Have you checked if the fan is spinning? I don't think the compressor is at fault but check it anyway. You should be able to hear the compressor running either in the wall unit or in the outside condenser housing. The only heat you should feel is from the condenser itself. If you blows warm air, that means the fan is working, if not that means the fan is not working. But don't be confused with the fan not working because in winter time sometimes the fan is not working and some times it does. As I said, it's a difficult problem to solve but at least start with checking the situation with the fan in the condenser.

switch off the unit, manually open the vents and check how dirty the fan blades are. Clean if required. if clean check gas level ,the fan speed is deturminded by the gas

Compressor working ?
Please follow this tips:

To get proper cool, keep the tips as follows:
1. Check air filter is cleaned. 2. Check indoor coil is cleaned. 3. Checkindoor blower motor is working. 4. Keep in cool mode. 5. Set temp minimum 3degrees less than room temp.6.Check compressor is working with correctpressure.
Please specify, if any error code..........
Thanks. Helpful?

Hi; If the fan comes on and there is no heat. First I am guessing this unit has touch pad instead of the old fasion push button selector. If unit has touch pad then I would check for a clean filter first. Then this unit is equiped with safety features for the compressor as well as the heat strips.If You are spiffy with a test meter and hand tools You can check for any burnt or loose connections(with unit unpluged from recepticle). If all seems well a connected please for the love of GOD call a repairman. The reason being checking safety features is a job You dont want to tackle without honned skills.

Check to see if your compressor is running. Thre are 5/16 screws on either side of the unit holding it to the case. Take those out and you can get to the cpmpressor. These are not complicated units but you may have to have a service tech look at it for you. I do sell a lot of these PTAC units so if your compressor is running you have leak or bad compressor. Russ

hi,
regarding on switch mode theres a common line between heating and cooling although fan is always connect on them.,also with the thermostat,the sequence on this when you switch to cooling and your connection is on heater,the contactor will shift to compressor source,so if there is no cooling, the contactor supplying the compressor is not functioning when you switch on cool mode.try to tighten screw on compressor relay maybe only loose.on control panel,or check continuity of compressor if the compressor still good,check also the freon charge using clamp ammeter,this should be done by ac technician.have a nice day
rate me up,thank's

Reset the unit to factory setting by take the master switch off of 10 sec.
Then press and hold the cool and heat button down while turning the master switch back on.