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Carrier blowing 3 amp fuse

Asked Dec 9, 2009, 04:12 PM — 11 Answers
I HAVE AN OLD CARRIER WEATHERMAKER 58SX. It keeps blowing the 3 amp fuse inside the unit on the control module. It will fire up the inducer motor, light the pilot, but when it comes time to start the blower motor, it blows the fuse and the blower motor continues to run, the inducer motor stops and there is no flame.

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11 Answers
mikew4xx's Avatar
mikew4xx Posts: 6, Reputation: 10
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#2

Dec 9, 2009, 04:14 PM
Could this be caused by the inducer motor pulling too many amps? I had to remove it and lubricate it for it to run.....
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KC13's Avatar
KC13 Posts: 2,567, Reputation: 514
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#3

Dec 9, 2009, 07:26 PM
Sounds like a board path is shorted to ground. Turn off power & remove circuit board from mount to view back. Look for evidence of arcing.
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mikew4xx's Avatar
mikew4xx Posts: 6, Reputation: 10
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#4

Dec 9, 2009, 07:52 PM
KC,
Thanks for the suggestion. That is how it all started from moisture collecting above the board and leaking down onto the connection. Replaced board, as it looked a lot like your picture. I have re-checked the new board, and it all looks fine. Any other suggestion is greatly appreciated. If the board is bad, will it always show evidence of arcing?
Thanks,
Mike
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KC13's Avatar
KC13 Posts: 2,567, Reputation: 514
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#5

Dec 9, 2009, 07:59 PM
Not always, but there are usually some visible signs. Be sure the moisture isn't an issue anymore.
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mikew4xx's Avatar
mikew4xx Posts: 6, Reputation: 10
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#6

Dec 9, 2009, 08:17 PM
I haven't noticed it anymore. Cleaned out drain tubes, reattached tubes, and sealed up lower condensation reservoir. Did I mention that it is 11 degrees outside? Lovely Thanks again,
I have a new inducer motor on the way and we will see if that helps...
~~Mike
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KISS's Avatar
KISS Posts: 12,613, Reputation: 4388
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#7

Dec 9, 2009, 09:08 PM
Inducer operates off of 120V and so does blower motor and the fuse is on the 24V secondary, so I don't suspect either.

The gas valve is a possibility. Did you try disconnecting the main burner portion of the gas valve?
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mikew4xx's Avatar
mikew4xx Posts: 6, Reputation: 10
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#8

Dec 10, 2009, 09:35 AM
Kiss,
Please don't laugh at my ignorance, but where is the "main burner portion of the gas valve" and then what do I watch for?
Thanks,
~~Mike
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KISS's Avatar
KISS Posts: 12,613, Reputation: 4388
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#9

Dec 10, 2009, 11:22 AM
The gas valve is actually two vales in one, that's why there are three leads. A common, pilot and main.

If this is your manual: http://www.xpedio.carrier.com/idc/gr...e=PdfHighlight

Pin #1 of the gas valve is the main burner

You can check the resistance of the coil and also the resistance to ground. Compare it to the pilot valve resistance.
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hvac1000's Avatar
hvac1000 Posts: 14,546, Reputation: 2381
Heating & Air Conditioning Expert
  
#10

Dec 10, 2009, 02:29 PM


It could be this
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