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Old 04-10-2011, 01:45 PM   #1
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Central heater works only when I help jump start the motor by turning it.


Hi,

I have a Goodman central heater unit model #GMT070-4. The heater just started giving problems. The burner will not turn on....... so I unscrewed the panel and acknowledge a humming noise from the motor. I turned the motor with my hand and then it started spinning....then the burner kicked in and everything worked fine.

I then turned the heater off for 5 minutes and turned it back on again. The exact same problem. It made the humming noise again. So I turned the motor with my hand again it started spinning and worked fine.

Can somebody please tell me what part to buy? I think the motor is okay since it spins freely without any resistance when the heater is off. The resistance on the motor is only there when the heater is "On" and making the humming noise.

I have another central heater that is 22 years old that I fixed several times. However, this unit is so different then my 22 year old heater.


Please help? Thanks.

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Old 04-10-2011, 03:47 PM   #2
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Central heater works only when I help jump start the motor by turning it.


Check / replace your capicator

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Old 04-11-2011, 07:14 PM   #3
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Central heater works only when I help jump start the motor by turning it.


thanks for your response. I just bought a capacitor for $3.30. I will let you know how it works. I will install it on Wednesday.
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Old 04-13-2011, 06:04 PM   #4
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Central heater works only when I help jump start the motor by turning it.


It wasn't the capacitor after all. It was the induced draft blower.

FYI - I normally buy my parts from Burke Engineering. They only sell to contractors or maintenance people like me. They were asking over $200 for this part while I found it on ebay for $110 new. When I told the person at Burke how much I was getting it for, he told me that $110 was his cost. This is a normal stock item for the company that is selling it on ebay.
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Old 12-11-2012, 01:07 AM   #5
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Central heater works only when I help jump start the motor by turning it.


It is not smart to buy a circuit board until you have exhausted all other possibilities for problems. You say you did are to G and are to W but you didn't say what happened when you did that. So what happened when you connector are to G on the circuit board.? The main blower motor should have started, Did it? When you touched are to W on the circuit the hot surface igniter should have begun to glow if all things were right. So if these things didn't happen then it is possible that it is the circuit board if it is not the transformer.

You ask what the transformer does. It changes 120 volts into 24 volts. Your furnace has two different wiring systems. The high voltage operates the two fan motors and the 24 volts operate all of the controls. Also something you have not mentioned is a fuse that is on the circuit board. If you have a short in your low voltage wiring this fuse will blow.
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Old 12-11-2012, 09:18 AM   #6
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Central heater works only when I help jump start the motor by turning it.


'ta hell was that ramble about???
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Old 12-11-2012, 10:54 AM   #7
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Central heater works only when I help jump start the motor by turning it.


Looks like someone replied on the wrong thread.
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Old 12-11-2012, 11:08 AM   #8
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Central heater works only when I help jump start the motor by turning it.


Can an HVAC pro like Yuri or the Doc tell us what is going on here? How can the main blower be humming and spin started, when the inducer motor never initiated? How would the furnace light when the pressure switch would not close with a non functioning inducer draft motor?
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Old 12-11-2012, 12:12 PM   #9
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Central heater works only when I help jump start the motor by turning it.


He's referring to the inducer when he said "blower".
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Old 12-11-2012, 12:26 PM   #10
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Central heater works only when I help jump start the motor by turning it.


Thanks Marty. When I hear "Blower" I think of main blower. When I hear "Inducer" I think of well................Inducer
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Old 12-11-2012, 05:24 PM   #11
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Central heater works only when I help jump start the motor by turning it.


Quote:
Originally Posted by Tindra View Post
It is not smart to buy a circuit board until you have exhausted all other possibilities for problems. You say you did are to G and are to W but you didn't say what happened when you did that. So what happened when you connector are to G on the circuit board.? The main blower motor should have started, Did it? When you touched are to W on the circuit the hot surface igniter should have begun to glow if all things were right. So if these things didn't happen then it is possible that it is the circuit board if it is not the transformer.

You ask what the transformer does. It changes 120 volts into 24 volts. Your furnace has two different wiring systems. The high voltage operates the two fan motors and the 24 volts operate all of the controls. Also something you have not mentioned is a fuse that is on the circuit board. If you have a short in your low voltage wiring this fuse will blow.
:su rrender:

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