Compressor and Fan not working)


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Old 05-09-14, 12:25 PM
J
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Compressor and Fan not working)

Hi

I have a Lennox Heater/AC unit on the roof of my office.
Now that it's getting hot, I switched to AC and notice that both the fan and compressor are not running. I have a little device connecting both to the fan and compressor with a little black button on it. When I push on it, both the compressor and Fan works.
So does anyone know what can be the problem? Capacitor? or my control unit Honeywell (W7212A1033)

By the way, I paid someone to come and check out my unit. They came, did some test on the machine (gas pressure, electricity). They left took my money and never came back. I guess they can seem to know the problem.
 
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Old 05-09-14, 01:18 PM
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What you are describing is probably the "contactor". It is energized by low voltage fed from the inside unit through the thermostat. You should be able to see 2 small thin wires connected to it. When the thermostat calls for cooling...it energizes the contactor which feeds high voltage to the compressor and fan through a capacitor. You should be able to see it pull in when that happens.

Do you have a multimeter and know how to read voltages?

It could be something as simple as a broken wire inside or just outside the unit. Happens often with animals chewing it or a hit from a weedwacker.

Also, check your fuses and/or ckt breaker as well as the disconnect near the unit if you have one. They may have flipped them off during the service and not turned things back on.
 
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Old 05-09-14, 01:56 PM
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Can you post a photo of the little black button ?

Does it cool when you push it ?

Did the RTU ( Roof Top Unit ) heat properly this last winter ?

God bless
Wyr
 
 

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