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Gas fired combo heat and a/c unit will not run. Breaker is not tripped, emergency switch is on, fuse on controller board is good, fan blade spins freely on condenser. Replaced thermostat, not any better. Suggestions?

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  • jeffkoke Aug 11, 2009

    Thanks...turned out there was a second emergency switch in an adjacent room that was switched off!!

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You need to check to see if you have 24 volts from the low side of the transformer you can 220 to high side and still have a bad secondary Russ

Posted on Jul 18, 2009

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The fan motor may also be going bad. Change the capacitor first. It will have to be changed anyway if the motor is bad.

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We have one of the ACC108PS air conditioners that is not cooling right - do we need freeon - if so is it rechargeable?


Start your window air conditioner troubleshooting with checking the different modes of operation to see which components operate. Turn the unit fan to on and the cool and heat modes off. If the fan does not operate, check the power supply to the unit. Check to see if the breaker or fuse for the unit is tripped. If the breaker/fuse is tripped, check to make sure that it is the proper size circuit for the unit you have. On some units, there is a current interrupter on the power cord to the unit. Check to see if it is tripped by pushing the reset button.
If the circuit is the proper size, then you can go ahead and reset the breaker/fuse. If it trips again, then you require further troubleshooting. Shut the power off and check all of the wiring in the unit to make sure that none of the connections is loose or damaged.
If the fan does not operate but the fuse/breaker is not tripped, you should check the run capacitor for the fan and compressor. If the capacitor is good but the fan motor does not operate, you can check the fan switch and the fan motor. Ensure that the fan blades spin freely.
If the fan motor operates but the compressor does not start, change the capacitor but first you should feel the compressor with your hand. If it is very hot, then you should allow it to cool.
Then, you should attempt to start the unit in the cooling mode. As you do so, listen for a clicking sound which is an indication that it is attempting to start. If the compressor starts but does not cool properly, the unit may be low on refrigerant.
If the compressor attempts to start but shuts off very quickly, the compressor could be bad. You could try installing a "Hard Start"



If the compressor does not attempt to start, ensure that the thermostat is set below room temperature. On units with a mechanical control, you will hear a click when you adjust the temperature. That is an indication that the thermostat is working properly.
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I have a 10-year old Carrier Gas pack Model #48GS024060301. Turned on the heat for the first time this season and the unit did not turn on. I was able to turn on the house circulation fan and since it...


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Is the compressor running? Check the circuit breaker or disconnect that is close to the outside unit if it isn't. It may be tripped on high pressure since the fan isn't running. If the unit has power, use a screw driver or something that will reach the fan blades and spin the fan to make sure it turns freely. If it doesn't the fan is probably bad. Next, check the capacitor for the fan motor. If it looks swollen then it is bad, otherwise check it with a multimeter. Most heating and air suppliers will test it for you. If the capacitor is good, the problem may be you fan motor.
You can check the fan windings with an ohmmeter.

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Hi, and the outdoor condenser fan should not be on at all in the heat mode unless this is a heat-pump!! So, I can see that this is a 3-ton Carrier split system and I haven't pulled up any information on it, only if I need to. But if the indoor unit runs on natural gas/propane, this would not be a heat-pump and the outdoor fan would run only in the cooling cycle. So, if it is not gas fired it is a heat-pump, and yes the outdoor unit should be up and running all year around. On a heat-pump you will have what is called a reversing valve in the refrigerant system that directs the flow of freon in the right direction for the season you are in. Most all heat-pumps will have a heat strip package installed in unit for emergency and aux. heat if compressor lets say fails. You're thermostat will have on it a selector switch, you will see on it these labels, Aux., emergency heat, auto/on/off/heat/cool. You will know from what I have just went through with you what you have. Forgive me for such a long explanation as I like my customers to understand more about there units in question. I could have just said yes or no and thanks? Doesn't work like that for me. I hope this has helped you out. One thing, If you determine this is a heat-pump and the fan is not on when in heat, you may have lost this condenser fan motor? You say both run caps. were replaced, and normally when you loose a run cap for a motor they will open internally, leak, buldge ect. So if this is taking place, if you can yourself take a look at the run cap. Also, make sure you have 220 volts to condensing unit. If not, check breaker probably a 30 amp double pole to see if it has tripped. You will have a disconnect box at the unit and inside there will also be 2 fuses. If you see only a pull out square connect, the fuses are still there but in behind the cover. If you have power and can hear the compressor come on but fan does not, I am positive you will have A faulty run cap, or faulty motor. Kill power to unit and try and slide a metal coat hanger down to prop or blade to see if it spins freely. If it is hard to turn bearings are froze up. If the capacitor seems to look ok, and the motor does spin free, It still may have open windings. Do these checks I have asked of you on power to the outdoor unit. If all is good, Stand in front of the unit and have someone turn the stat on for what season you are in. Lower or raise temp a ways above or below room temp. You should her the contactor close and compressor will start along with the condenser motor.If compressor starts and motor does not, then I would say it has failed and or cap again. When a motor is replaced, the run cap must always be replaced to!! Please get back to me and keep me posted. I will wait to hear what has happened. Good Luck.
Sincerely,
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