AC furnace blower kick on and off after 5s

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  #1  
Old 05-31-16, 12:45 PM
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AC furnace blower kick on and off after 5s

I have a goodman awb24-08d furnace.The furnace has been working fine all winter. I recently turned on the A/c for the summer but the fan kicked on for 5s then kick off.I then went to the thermostat and try to manually turn on the fan but the Auto/on switch kick the fan on for 5s then off.If I turn the heat on the fan works perfectly.I just replaced the board control and blower capacitor.I have some pics.In the pic i disconnected NO and NC wire for test.Can anyone help?
http://imgur.com/a/sumPO
 
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Old 05-31-16, 02:24 PM
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You may have a bad blower motor. Generally, the blower runs at a different speed for heating and cooling. It's possible that the winding for the cooling speed is bad (probably shorted).
 
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Old 05-31-16, 02:24 PM
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As you can see in the wiring diagram in heat mode the fan is started by the heat sequencer and in cooling mode the stat starts the blower. Do you have a voltmeter?
 
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Old 05-31-16, 03:31 PM
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Thanks for replying
I do have voltmeter.In the cooling mode i hear the sequencer kick the fan on and then kick off.Is it not normal?.And i just replaceed new t-stat
 
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Old 05-31-16, 03:55 PM
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Set your stat to call for cooling and put your meter on G and C on the broad. You should have 24 volts.
 
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Old 05-31-16, 10:56 PM
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I checked the volt on C and G on the furnace control board.It showed 28v.It is a little higher than you said 24v.May i have bad sequencer?
 
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Old 06-01-16, 04:58 AM
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24VAC is the nominal voltage, however it often runs slightly higher than that. 28VAC is okay.
 
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