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Old 06-18-2015, 05:13 PM   #1
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AC problem-outdoor unit doesn't come on


My AC stopped working.
Indoor unit comes on when I lower the temperature on the thermostat. Fans comes on, but no cold air.
Outdoor unit is no turning on.
Checked the fuses next to the outdoor unit, seems okay.
What else can I check/try before calling a technician? Details please.

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Old 06-18-2015, 05:58 PM   #2
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AC problem-outdoor unit doesn't come on


Check the fuses or breakers inside the house at the elec panel.

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Old 06-18-2015, 06:08 PM   #3
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AC problem-outdoor unit doesn't come on


Do you have a meter?
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Old 06-18-2015, 06:09 PM   #4
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AC problem-outdoor unit doesn't come on


Depends on how comfortable with wiring diagrams you are. You can open the panel on the outdoor unit. Check if the contactor is pulled in. Check if there is 24v ac across the coil. (2 smaller wires near the base of contactor) if there are any safeties, make sure they are not stopping the contactor from getting the signal. Check that you have main power on both sides of the contactor. (120v to ground, 240v between legs) check that you have voltage on all 3 connectors on the capacitor. (120v to ground, near 0 across the connectors)

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Old 06-18-2015, 06:10 PM   #5
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AC problem-outdoor unit doesn't come on


shut off t stat....have someone stand by outdoor unit ...switch it to cool ..see if you hear a click ..that is the 24 volt control pulling in the contactor to turn on unit....if you hear a click then 24 volt side is working ..
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Old 06-18-2015, 06:23 PM   #6
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AC problem-outdoor unit doesn't come on


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Originally Posted by roughneck View Post
Do you have a meter?
Yes, I have a meter.
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Old 06-18-2015, 06:40 PM   #7
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AC problem-outdoor unit doesn't come on


Check high voltage and incoming control voltage.
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Old 06-19-2015, 08:40 AM   #8
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AC problem-outdoor unit doesn't come on


Be careful when checking the line voltage . Good idea to wear leather gloves and safety glasses . Always assume the power is on , until you have checked it yourself . Then check it again .

Is the low voltage wiring , from the condenser unit , to the house in flex or conduit ? Or is it run " wild " ? If run wild , check for damage by pets , vermin or weed eaters .

Are both the compressor and the outdoor fan failing to come on ?

God bless
Wyr
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Old 06-19-2015, 07:28 PM   #9
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AC problem-outdoor unit doesn't come on


Quote:
Originally Posted by WyrTwister View Post
Be careful when checking the line voltage . Good idea to wear leather gloves and safety glasses . Always assume the power is on , until you have checked it yourself . Then check it again .

Is the low voltage wiring , from the condenser unit , to the house in flex or conduit ? Or is it run " wild " ? If run wild , check for damage by pets , vermin or weed eaters .

Are both the compressor and the outdoor fan failing to come on ?

God bless
Wyr
The indoor unit fan comes on with thermostat control.
The outside condenser unit does not turn on, no fan.
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Old 06-19-2015, 09:27 PM   #10
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AC problem-outdoor unit doesn't come on


Probably a bad Dual Capacitor which is why neither the compressor or fan are coming on. Easily check by pulling disconnect for safety, take side panel off... Look at the capacitor to see if the top is bowed outwards like a frozen beer can...if so it is bad. Part costs about $8. If no visible damage, then get a multi-meter and see it to the uf selection and check the microfarads. The capacitor should have the microfarads on the label of what it should be. Then you can match it up with the meter.... good luck!
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Old 06-20-2015, 03:51 PM   #11
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AC problem-outdoor unit doesn't come on


1st see if the contactor is pulling in at the outdoor unit...then go from there..
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Old 06-20-2015, 04:26 PM   #12
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AC problem-outdoor unit doesn't come on


Turn the power off to the condenser unit . Verify it is off with a meter .

Try to determine if there are any temperature or pressure safeties that are wired in series with the coil of the contactor .

Check , with a meter , to see if you have 24 VAC present at the low voltage wiring coming from the furnace ( inside the house ) at the condenser unit .

God bless
Wyr

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