blower motor wont shut off

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Old 07-12-15, 10:19 AM
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blower motor wont shut off

goodman central air cond. original problem was compressor would not start. was going to try a hard start when i noticed one of the 24 volt wires on the contactor was loose.didnt kill the power like i should have and took the wire off to tighten the terminal and it touched a hot leg.now the inside blower will not shut off and it will not send the 24 volts to the outside contactor either. i checked the transformer its ok then changed the themostat and it does the same thing.
 
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Old 07-12-15, 10:54 AM
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Could you clarify, did one of the 24V wires from the contactor touch one of the 240VAC wires on the contactor? If the outside unit connects to a control board on the furnace or air handler and one of the control (24V) wires touched one of the 240V wires, it's possible that the control board was damaged. Could you give us the model number of the furnace/air handler?
 
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Old 07-12-15, 11:02 AM
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If you're lucky...... all you did was blow a fuse on the control board. Look for a 3A or 5A plastic automotive type fuse.
 
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Old 07-12-15, 03:01 PM
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checked the fuse its ok model# isgmh80603anaa diagnostic blinked once on the circuit board and i shut it off and back on same thing and yes it touched one side of the hot leg on the contactor
 
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Old 07-12-15, 03:05 PM
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Check the back side of the board.
 
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Old 07-12-15, 03:08 PM
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yes the wire touched a hot leg on the contactor checked the fuse its good model# gmh80603anaa. the diagnostic blinks once saying to many tries i think that has to do with the gas heat though, i turned it off and waited for it to reset and its doing the same thing
 
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Old 07-12-15, 03:10 PM
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The manual says that a single flash indicates a System Lockout (Retries/Recycles Exceeded). You could try removing power from the system for ~30 minutes and see if the board will reset itself and start working. However, since you applied 240VAC to a portion of the circuit board that normally has 24VAC, it's likely that you damaged the board. You may have no recourse but to replace the board.
 
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Old 07-12-15, 03:11 PM
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how do i check the control board i usually work on older systems
 
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Old 07-12-15, 03:15 PM
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ill try a longer reset i only shut it off for maybe a min .no way to check the board? and would that keep the blower on and no 24v to the outside?
 
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Old 07-12-15, 03:27 PM
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It's unlikely that you'll find component level information on the control board. Most service information treats these boards as a "black box", just showing the connections to it. There is probably a relay on the board that controls the blower operation. The voltage surge probably damaged the circuitry that controls the fan relay. Again, without a schematic diagram of the board, it's difficult to know how to test the board.
 
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