Carrier Circuit Board Electronics Identification


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Old 12-20-12, 10:10 AM
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Carrier Circuit Board Electronics Identification

Hello All,

I have been troubleshooting my Carrier 58se "fan always on" problem thanks to this forum. It looks like I will need to replace the circuit board (302075-302), but I am really curious as to what this component is that I have circled red. Is it a diode? If it is, it is shorted. Can anyone identify it?

[ATTACH=CONFIG]6843[/ATTACH]
 
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Old 12-20-12, 11:05 AM
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It's a resistor. The colored bands tell you the value. It's basically just a larger version of the little ones above it.
 
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Old 12-20-12, 12:03 PM
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Ahhh, got it. I was hoping that it was a failed diode and an easy fix. The only thing left that I don't know how to test is the triac/timer, but looks like I still need to order the new board.

Thanks for your response.
 
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Old 12-20-12, 12:33 PM
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You can test a triac using a multimeter. If I recall correctly the triac needs to be removed from the circuit for testing.

The good thing about most triacs is they are pretty generic. If your's is a three wire/pin that really narrows things down.
 
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Old 12-20-12, 12:36 PM
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Replacing parts on the circuit boards of heating equipment is not recommended.


If the board isn't working properly, replace the circuit board. That's a VERY old board, and by replacing it you replace a lot of other old parts as well.
 
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Old 12-20-12, 04:52 PM
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Yes, I am going to replace the board. I wouldn't risk creating a fire hazard over the purchase of a ~$60 part. But I would try repairing it just for fun if it came down to a $3 diode. I enjoy the process.

Thanks.
 
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Old 12-20-12, 05:47 PM
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Have you ruled out the obvious things - short in t-stat wires (between r and g), high limit not stuck open, etc?
 
 

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