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Old 11-10-2012, 12:32 PM   #1
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Duo-Therm high amp draw

I have two 13.5k btu Duo-Therm air conditioners. The one in the bedroom won't start in AC or heat. When I turn it on, it tries to run but the Amp meter at the control panel shows it drawing 50 - 55 amps for 1-2 seconds, then kicks off. Any ideas what I can check?

Thanks for any advise!
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Old 11-10-2012, 06:44 PM   #2
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Almost sounds like the compressor is locked up and it's kicking the overload. You can go up top and listen to it as someone turnes it on
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Old 11-10-2012, 08:45 PM   #3
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Shut off the power to both A/C's. Remove the cover and inspect all of the connections. Check all of the electric connections from the panel box up to the A/C's. Tighten all screws. If all looks good then check the capacitors. Smell them. If they are bad then they have the burned electrical smell. If you do not know this smell find someone who does. If all checks out then you have reached your limit and need an experienced A/C tech.

When I bought my 5'er I had easy start kits put on both of the A/C's. This gives them a starting boost especially in low voltage conditions. They start the fan first then the compressor just snaps on 10 seconds later even if the voltage is a little low. This is a good idea for all A/C's including house central units. The kits for RV's are about $ 55.00 plus installation.
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Old 11-11-2012, 06:23 AM   #4
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My first thought is that it is the start capacitor. If you're going to attempt replacement, short across the terminals to discharge it before trying to disconnect the wires.
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Old 11-17-2012, 10:50 AM   #5
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Finally got a chance to pull the A/C cover and inspect the capacitors. Both were fine but the PTCR device (Positive Temperature Coefficient Resistor) was burned up so I ordered a new one. Hopefully, that will be al that is wrong.

Thanks for the help!
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