Freddrick ptac a/c unit comressor never comes on relay on compressor seems good,m what now?

I've replaced many Amanda control boards. They have micro relays attached to the board. These relays are about a half inch by 1 inch in size, and control line voltage to the compressor and blower motor, and give up quite often. Its probably the board if its a digital controlled board. If it has manual, turn to select, type knob, it will be in that fan section knob. Hope this helps!

Does the unit cool ok? If yes, you likely have a problem with reversing valve. If no, likely a refrigerant problem.

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

if the compressor is NOT running you have problem with this devices:
Compressor Overload and/or relay Thermostat (Open thermostat) Burnt wiring Bad selector switch Capacitor test any devices.

THE LOW PRESSURE SWITCH
SYSTEM IS PROBABLY LOW IN FREON
TO CONFIRM LOCATE LOW PRESSURE SWITCH AND JUMP
THE TWO PINS IF COMMPRESOR ENGAGES THR SYSTEM IS LOW
DONT LEAVE IT JUMP YOU WILL BLOW UP COMPRESSOR
NEEDS FREON TO CARRY COMRESSOR OIL TRUE OUT SYSTEM

Hi,
The compressor is in a locked rotor condition..which means that it is trying to spin but cannot, probably because of a mechanical failure within the compressor...
You will need to replace the compressor, but for most window units it is cheaper to replace the whole unit...


http://www.fixya.com/support/r3571569-air_conditioner_trouble_review_the_possi

heatman101

ck the pressure switch on the a/c accumulator, should have power going through it.

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

Check contactor on outside unit for burned contacts. Try to manually press the contactor with INSULATED screwdriver to test. Should be some **** on cotact buttons. Hope this helps. Let me know. Good luck

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

You need to replace your control board, but if you are can repair it by your self you can change the relay that supply the fan and condenser.