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If its low on refrigerant, the low pressure switch will drop out the compressor. If it has an extremely dirty condensor, the high pressure switch will drop out the compressor. If it has a bad condensor fan, the high pressure switch will drop out the compressor. If the internal overload of the compressor is weak and it is marginally low on refrigerant, the compressor will stop until it cools down. The list goes on and on and on.... These are the first four most obviouse that comes to mind.
please make sure first your air con,s compressor is working if it, working and it,s not getting cold then it can be low gas problem or if compressor is not working then please check the thermostat settings and make tempreture correct and setting on cool mode
then i hope if it,s only normal problem then your air con will work again .
after that if not get cold then contact to air con technician for repair it (it,s need to repair and only air con special maintenance person can do it)
1) valves weak/broken and pressure is leaking in from the high side of the system.
2) AC compressor is not running. Make sure the compressor is actually running. It has a low rumbling noise to it - and often you'll need to actually 'feel' the compressor for the vibration (of running). Or feel of the big copper line (it should be cool-cold) - or - feel the smaller of the two lines (warm to hot).
there is no fuse on your condensing unit outside. pull the disconnect to kill the power to the unit and take off the removable panel above the 2 service valves. there will be an oval shaped capacitor that is marked herm and fan. there will be a rupture disc on the top that may have ruptured. also inspect the low voltage wiring(will still be hot unless you turn off the switch at your furnace). this low voltage wire operates a magnetic coil on the bottom of the contactor that closes a high voltage circuit to the fan and compressor.
have u checked your low pressure and high pressure when compressor is on. Remember the compressor has a thermal protection switch if the compressor has too much freon the A.C will work for a while turn off, then turn then off and on. Are the air filters for the evaporator clean, is the blower fan blowing the correct way. How long ago did the evaporator coil got cleaned. With a properly cleaned filter and evaporator coil you can now check for pressures. Use your ammeter and check how much the compressor is pulling and compared it to the name plate. How much tons your A.C. If you give me how much tons and low and high readings I might help you diagnose the problem. Make sure the evaporator is clean blower blowing correct way condenser cleaned and condenser fan rotating the correct way