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Old 06-13-2010, 02:18 PM   #1
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trane xr 12


I have a trane xr 12..... The fan is coming on but the compresser is not engaging. It tries for just a secend every few min.s. I looked at the contacts and they are good can i try to add freon? It has been working fine and just stoped all of a sudden.
Last night the fan would not even come on?

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Old 06-13-2010, 04:07 PM   #2
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If it was low on refrigerant, it wouldn't have tried to come on.
If you left it keep trying to run all night. Good chance you have left it do some major harm tot eh compressor.

Do you have an electrical meter? Do you feel comfortable placing your hands/fingers near 240 volts?

If not. You may want to consider calling a service tech.

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Old 06-13-2010, 06:12 PM   #3
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Originally Posted by CAMOARCHER View Post
I have a trane xr 12..... The fan is coming on but the compresser is not engaging. It tries for just a secend every few min.s. I looked at the contacts and they are good can i try to add freon? It has been working fine and just stoped all of a sudden.
Last night the fan would not even come on?
Besides the contacts, maybe there is a bad connection [high resistance] somewhere in the compressor wiring.

If the current is abnormally low during startup it may be a high resistance connection.
If the current is abnormally high during startup you probably have some real problems.
A peak-reading clamp-on ammeter will tell you. No voltage to worry about.
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Old 06-13-2010, 07:01 PM   #4
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You might just have a blown capacitor.
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Old 06-13-2010, 08:47 PM   #5
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Checking a cap without a C meter is a bit involved.
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