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Old 01-05-2014, 03:23 PM  
brampup
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Default Unit quit working

Trane XL 1200 - Model YCY030F1MOA not working. Main board is flasing indicating Pressure Switch not working.

If I close the contact on the Compressor Contactor Coil it turns on. When the back of the blower motor is touched it is hot but has not been on in several days.

Fuses are good, voltages are good.

Any thoughts would be appreciated.

Thanks



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Old 01-05-2014, 04:48 PM  
Wuzzat?
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Check if the blower motor is seized. Is it getting full voltage?

The odds are apparently good that if you replace the pressure switch it will clear up at least one problem unless that signal may also mean the pressure is out of range.

Post a schematic.



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Old 01-05-2014, 06:09 PM  
brampup
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Wuzzat, thanks for the reply.

The pressure switch is new as of this summer. I feel that is not the problem.

I leaning toward the fan motor due to the end being hot and it is not operating. I think that the fan has to be working for the pressure switch to function properly. Since the fan is not running it shouldn't be hot, I'm thinking. This last point I'm not 100% sure about.

I did measure voltage to the main wires is that area.

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Old 01-06-2014, 05:52 PM  
kok328
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blower motor, fan motor, inducer motor, draft motor.
I picture the first two being the same and the last two being the same.
If your inducer/draft motor is hot but, not turning, it could be bad assuming no physical blockage.
This will cause the pressure switch to fault.

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Old 01-06-2014, 06:37 PM  
brampup
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Gentlemen, it was the Blower, Combustion motor. Working like a champ. The fan blades of the old motor moved but grudgingly. But with power on did not turn at all.

Thanks for the help and keep smilen!!

Off to watch FSU teach Auburn a little about ACC football.

Thanks again.

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Old 01-06-2014, 08:06 PM  
Wuzzat?
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Quote:
Originally Posted by brampup View Post
Gentlemen, it was the Blower, Combustion motor. Working like a champ. The fan blades of the old motor moved but grudgingly. But with power on did not turn at all.

Thanks for the help and keep smilen!!

Off to watch FSU teach Auburn a little about ACC football.

Thanks again.
You probably paid yourself $100/hour of tax-free income on this job. Plus the knowledge you gained.

Now that everything is working, take voltage and current measurements everywhere; you may someday need them.
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Old 01-07-2014, 11:08 AM  
brampup
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Good point Wasset! I have some of the basic voltages traciking this issue but did no take the time to log as many as I should.

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Old 01-16-2014, 09:52 PM  
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I assume it is control board fault..It happens often on tranes units



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