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Old 12-04-2010, 04:36 PM   #1
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Ruud Achiever 80 won't run


Ruud Achiever 80 furnace/A/C won't start. Nothing works, including the blower. I found that the regular light-style external switch in the attic that supplies power had been brushed into a position halfway between On-Off while moving junk around. I turned the switch ON, checked the breakers, but the system is completely inoperative. The thermostat clicks, still can't turn fan or A/C or heat on.
Do I need to reset the unit somehow? I can't see how to open the side panels on the furnace box near where the wiring and 24VDC line enter.

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Old 12-04-2010, 07:18 PM   #2
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Ruud Achiever 80 won't run


That switch may be broken. They fail from old age too. Need to see if you are getting 110 volts thru it with a voltmeter or electrician/tech buddy.

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Old 12-05-2010, 10:45 AM   #3
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Ruud Achiever 80 won't run


Also check if there is a low voltage fuse that is open in the furnace
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