Goodman GMPN080-4 blown 3A fuse


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Old 07-07-12, 09:45 AM
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Goodman GMPN080-4 blown 3A fuse

Hi, my name is Ken and I live in WV where we are having some intense heat. My AC unit quit last week and all I discovered was a blown 3A fuse on the circuit board which I replaced. Worked fine for 5 or 6 days then blew again.

Once replaced it blew immediately upon restoring power. I did the stupid thing and replaced it with a 5A fuse and it started and ran for 15 to 20 minutes before blowing again. This time I could smell something burnt. Discovered the transformer had a burned winding (smaller diameter wire winding).

Replaced the transformer with one from Ace Hardware and ran all night. This morning blown again! It immediately blows the fuse every time I restore power now, but if I place the unit in fan mode the fan runs fine.

I have these measurements from my VOM;
XFMR Secondary 1 ohm
Stat wires to grnd - W 1.2K ohms
G 9.3 ohms
R 9.3 ohms

Please, does anyone have any ideas?

Ken
 
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Old 07-07-12, 09:51 AM
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Just replaced fuse again to try and at least run the fan and it blew immediately. Not sure what to check next. Getting warm in here.....may be my temper!

My mistake. I put the fan to "on", but I forgot to turn off the AC. With the AC off the fan will still run.

I have 120 VAC at the transformer primary and 28VAC at the secondary. It is a 40 VA 120/24 VAC transformer.

Ken
 

Last edited by kcamp99186; 07-07-12 at 10:07 AM.
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Old 07-07-12, 10:05 AM
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Old 07-07-12, 10:21 AM
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A BIG thanks to you, Houston! A quick look and I found where the wire had become pressed down onto the frame and shorted through. Quick repair and all appears to be working again.

Thanks ever so much for the prompt reply.

Ken
 
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Old 07-07-12, 10:27 AM
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I am glad to help.

Stay cool...
 
 

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