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Old 08-30-2014, 06:55 PM   #31
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3Amp fuse on Fan Board blowing!


Looks like the blue wire does in fact energize the contactor from the defrost board...it is on the same connector as the reversing valve.

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Old 08-30-2014, 06:58 PM   #32
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3Amp fuse on Fan Board blowing!


Are we making any progress? Seems like the problem has been isolated to the defrost board...specifically in the RV circuit or the contactor energizing circuit. Any thoughts?
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Old 08-30-2014, 07:59 PM   #33
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3Amp fuse on Fan Board blowing!


bad board/new board
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Old 08-30-2014, 08:00 PM   #34
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3Amp fuse on Fan Board blowing!


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Originally Posted by russkateer View Post
Are we making any progress? Seems like the problem has been isolated to the defrost board...specifically in the RV circuit or the contactor energizing circuit. Any thoughts?
Whichever board, circuit, etc, that Y and O have in common is most likely the problem as you said either one of those signals blows the fuse.
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Old 08-30-2014, 09:47 PM   #35
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3Amp fuse on Fan Board blowing!


check the plugs on the defrost board which feed the rv to ground and to each other.

or give rv 24 volts from 24 to heat pump directly. or pull off defrost board and look on back for burn marks.
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Old 09-03-2014, 10:48 AM   #36
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3Amp fuse on Fan Board blowing!


OK, finally got back to this...been cooler so not as high a priority.

Interesting note, I connected everything back up and tried heat from the thermostat ( I believe I had manually called for it jumpering, which blew the fuse) but contactor pulled in and everything fired up.

That puts all my eggs in the RV or RV circuit as being bad...I think. I pulled the defrost board out (which has the RV circuit) and I don't see any bad components...or burn marks.

Do I just buy a new board and cross my fingers? If it is the RV then I'm out of my league anyway.
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Old 09-03-2014, 10:56 AM   #37
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3Amp fuse on Fan Board blowing!


Pretty sure this is not good...everything is working now. Even ac...the HVAC elves came over the weekend?

Probably not the last you will hear from me. I didn't change any components, just fuses and checked stuff. What do you all think?
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Old 09-03-2014, 11:23 AM   #38
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3Amp fuse on Fan Board blowing!


You'll probably go through another bout of blown fuses as soon as whatever stressed the weak link reaccurs. I also now that when you test for heat whether for an RV or furnace in summer time your asking for the system to act up. Why our local HVAC lab classes reserve the heating portion of the lab classes for winter. Otherwise nothing worse right.

Perhaps in your case someone accidentally called for heat (in summer) momentarily at the thermostat staring this whole issue.
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Old 09-03-2014, 11:46 AM   #39
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3Amp fuse on Fan Board blowing!


I think I already said this but I had a similar problem in rental and after testing the capacitor which tested good, and exhausting all other avenues I could think of, replaced the blower capacitor with a spare I had on hand, and that was it, a bad cap that tested good made in China. I would swap with the spare or if more then 5 years old swap out cap and contactor'sanyway for ppreventative maintenance. I do every 5 years caps and contactor's.
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Old 09-03-2014, 04:01 PM   #40
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3Amp fuse on Fan Board blowing!


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Originally Posted by CWO4GUNNER View Post
I think I already said this but I had a similar problem in rental and after testing the capacitor which tested good, and exhausting all other avenues I could think of, replaced the blower capacitor with a spare I had on hand, and that was it, a bad cap that tested good made in China. I would swap with the spare or if more then 5 years old swap out cap and contactor'sanyway for ppreventative maintenance. I do every 5 years caps and contactor's.
Its his low voltage fuse that is blowing. not a line voltage fuse. So a bad capacitor for a motor won't cause the problem he is having.
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Old 09-03-2014, 08:14 PM   #41
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3Amp fuse on Fan Board blowing!


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Its his low voltage fuse that is blowing. not a line voltage fuse. So a bad capacitor for a motor won't cause the problem he is having.
Believe it or not, you just made my point.
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Old 09-03-2014, 08:32 PM   #42
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3Amp fuse on Fan Board blowing!


?????
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Old 09-04-2014, 01:03 AM   #43
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3Amp fuse on Fan Board blowing!


disconnect the o/b wire from stat and run system through stat. if nothing blows, rv is bad. granted do not expect to have cool on call for cool or heat while on call for cool with reversing valve wire unplugged, but if nothing blows than that's your problem, rv.

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