Please help with home A/C unit not running

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Old 05-19-13, 04:04 PM
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Unhappy Please help with home A/C unit not running

Hello!

We have a Lennox whole house A/C unit connected to the furnace. It was put in when the house was built in 1989. It has been sounding a bit "sick" the past few years, but this year it won't run at all. It doesn't even hum. I've flipped all the circuit breakers to no avail. I can't even get the furnace fan to run so I can at least get the air circulating in the house. Can anyone point me in the right direction?

Thanks!
 
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Old 05-19-13, 04:59 PM
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Has anyone been working around the furnace lately?
The power switch to most furnaces is a standard light switch.
It may have been turned off by mistake.
 
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Old 05-19-13, 06:23 PM
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The light switch is on. I flipped that on and off too.
 
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Old 05-19-13, 08:43 PM
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Damage to the low voltage wiring by the outdoor unit will often pop the low voltage fuse at the furnace if one is present.



I would be surprised if a 1989 furnace had a fuse to protect the 24 volt transformer.

Many furnaces from the 80's had a fan center instead of a circuit board with a fuse on it.



A damaged transformer will usually have a strong burned smell when damaged.
It will have high voltage to it, but will not have 24VAC on the secondary side.
 
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Old 05-20-13, 08:46 AM
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Where would I find this fan control center?
 
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Old 05-20-13, 10:03 AM
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The fan center is usually behind the louvered access door on the front of your furnace. In some cases it's in the lower section with the blower.

If you remove the servicing doors you should see it.
 
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