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Old 11-03-2008, 12:52 PM   #1
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Trane Rooftop Unit

i have a trane rooftop unit model ych120c4loac... and on the themastat it is reading COOL FAIL could anyone tell me what sensor needs replaced??

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Old 11-03-2008, 04:22 PM   #2
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Trane Rooftop Unit

could be the lo/hi pressure switch locking out the machine and waiting for a main power reset.if you can't get to the roof .....shut the stat then cycle the disconnect that goes up to the roof from the electrical closet space .then reset the stat for cooling and see if it comes up again.cool morning and a condenser fan running might of knocked it down on LP.

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