Have To Reset A/C Breaker When Power Goes Out - Electrical - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Electrical


Thread Tools Display Modes
Old 08-26-2011, 04:37 PM   #1
Join Date: Apr 2010
Location: Tulsa, OK
Posts: 23
Rewards Points: 10

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.




Last edited by BPC; 08-26-2011 at 04:53 PM.
BPC is offline   Reply With Quote
Old 08-26-2011, 06:47 PM   #2
Electrical Contractor
kbsparky's Avatar
Join Date: Sep 2008
Location: Delmarva
Posts: 3,368
Rewards Points: 2,000

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.



Life is uncertain -- eat dessert first!!
kbsparky is offline   Reply With Quote
Old 08-26-2011, 07:04 PM   #3
Join Date: Oct 2010
Location: Ontario, Canada
Posts: 24
Rewards Points: 10

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).
CuHead is offline   Reply With Quote
Old 08-26-2011, 08:37 PM   #4
Missouri Bound's Avatar
Join Date: Apr 2011
Location: Almost Arkansas
Posts: 2,764
Rewards Points: 2,000

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.
Missouri Bound is offline   Reply With Quote
Old 08-26-2011, 10:52 PM   #5
dmxtothemax's Avatar
Join Date: Oct 2010
Location: Brisbane, Australia.
Posts: 4,321
Rewards Points: 5,600

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.
dmxtothemax is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
breaker not popped but no power natrensland Electrical 29 06-11-2011 12:43 PM
GFCI outlet failed in a rain storm, now has no power! Kaybee33 Electrical 5 12-28-2010 05:38 PM
Breaker Tripping Jeridmar6 Electrical 15 07-10-2010 08:20 PM
Main Breaker Trips Repeatedly kkf Electrical 7 06-18-2007 04:31 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1