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Fuse or Freon?

I have the same problem - unit worked fine for a long time then suddenly started blowing just air or warm air. Is there any way to check to see if it is the fuse or the freon? And is it possible to change either of these once they have been found the problem? Its July and it is HOT in here!

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Re: Fuse or Freon?

Yes, you can check for freon: you can force the compressor on using 2 jumper wires. look for the wires leading to the compressor motor. Disconnect these wires from the source (not at the compressor). Using jumper wires, connect external house power (120 VAC) directly to compressor and turn that power on. The motor should start. If the copper lines (or finned radiator) get cold, then your freon is ok. There is usually not a fuse in these units.

Posted on Jul 03, 2007

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Hi I keep getting a ch 67 after the unit starts fine and runs for like five minutes fan on all units work during that five minutes any thoughts would be greatly appreciated

Low freon pressure switch is turning it off. As the coils cool down the pressure drops. As time goes on it will run shorter and shorter cycles. In warm weather freon 22 low pressure should be near 70 lb
410A freon about 150 on the low side

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1 Answer

Have Ptac units that work fine one minute and 2 hours later just blow warm air.. some that also freeze up the front coils

I think your PTAC is under charge, if the air filter is clean and the evaporator is also clean together with the blower. Check the freon charge and refill if suction pressure is below 50psi and discharge is below 190 psi.

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Fedders air conditioning model a3t12f2ag , my unit runs fine but it will not blow cool air?

you either have internal thermostat problems, selector switch problems or youve got a freon leak. to determine a freon leak is the units coil freezing up or is it dirty check filter first take unit out and to car wash remove housing and give it a bath dont plug it back in until its dry.hope this fix works if not work your switches remember they set in one position most all the time if freon call a tech

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No cool air

sorry but you will need to have your freon levels checked and have them check all freon connections checked some times a vibration or a bump is enough to cause a leak

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My heat unit will not blow hot air unless we go outside and hit a button on the back bottom of the unit. Once we do that it will blow hot air for that cycle. when it is time for it to come on it is cold...

If it does not have a furnace or heating elements for heating, then it is a heat pump, which is rare for a central AC system, but makes sense of the fact that it blows warm air when you reset the pressure switch, which may indicates freon pressure charge problem if your AC system has a reverse valve and uses freon to for heating (heat Pump).

Do you get heating when outside unit runs? if you do, check freon pressure levels and top up to required pressures. The button you depress is a pressure reset switch ... that is if your AC system is a heat pump ... which, as pointed above, it is not common for central ACs.

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make sure you have freon in your system. they act as a heat pump which does A/c as well s heat. without freon you want have cooling or heat.

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