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Old 08-26-2011, 04:37 PM   #1
BPC
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Have to Reset A/C Breaker When Power Goes Out


I wanted to know if anyone has ever had this problem.

This problem happens when the power goes out at my house. Eventually when its restored, the central A/C will not come on. You can see that the "cool" indicator on the digital display is flashing, but the compressor and blower motor are not running.

When I check the load center, the breaker is not tripped. Then I turn the breaker off, then back on and everything is fine again...until the next outage.

The load center for all of the 220V circuits is outside, so it's a pain to go out there every time the power goes out.

My instincts tell me that the unit is not responding, since the "cool" is flashing on the thermostat, but I don't have a manual for it, so I can't look it up. It's just a standard Honeywell unit.

Comments?

Thanks,
Brian


Last edited by BPC; 08-26-2011 at 04:53 PM.
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Old 08-26-2011, 06:47 PM   #2
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Have to Reset A/C Breaker When Power Goes Out


Some units have a lock-out feature built-in for catastrophic events. This is usually for things like excessive head pressure, or low-pressure cut-off. To reset this, you have to interrupt power, and restore it again. Are you SURE your breaker is not tripped when you do this?

I don't know why yours is doing this from power outages. You might want to post this over in the HVAC forum to see if they have any more information to offer.

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Old 08-26-2011, 07:04 PM   #3
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Have to Reset A/C Breaker When Power Goes Out


How long of a power failure, and how long do you wait after the power comes back on? My Honeywell thermostat has a 5min lockout on the a/c after a power failure, before it calls for cool again (flashes "cool" during this period).
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Old 08-26-2011, 08:37 PM   #4
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Have to Reset A/C Breaker When Power Goes Out


Next time (if it happens) try cycling the thermostat instead. You shouldn't need to touch the power supply. Turning the thermostat off and waiting 5 minutes should take care of it.
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Old 08-26-2011, 10:52 PM   #5
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Have to Reset A/C Breaker When Power Goes Out


Sounds like a lock out feature of the ac system,
This is necessary because after a power failure,
especially if it is short, the compresssor can stall,
depending on where abouts in the stroke the compressor is.
Stalling puts a huge load on the motor and can cause
motor burn out.
So when the power comes back on the microprocessor control
will wait for a set time period before reappling power to the compressor.
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