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Old 11-01-2011, 11:49 PM   #16
how
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Carrier Control Board


Hey doc
This might not correct your current problem (if your board is already fried) but on a couple of recomendations by manufactures when I've complained about multiple board failures, they've advised me to search for poor grounds all the way back to the house panel. On almost all those problem heating systems I have discovered questionable grounds.

Of course I have not bothered to go the distance in checking out systems with no problems to compare and see if they also have questionable grounding.


Last edited by how; 11-01-2011 at 11:52 PM.
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Old 11-01-2011, 11:58 PM   #17
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Carrier Control Board


I'll do that. Thanks bud.
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Old 11-02-2011, 03:54 PM   #18
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Frigging nightmare. Pics coming.
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Old 11-02-2011, 04:42 PM   #19
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Carrier Control Board


First thing I did was wire the inducer hot to make sure it would come on. it did. Then, as the inducer was running, I checked continuity through the pressure switch. It was closed. All good so far.

Get to removing all wires, one at a time and placing them on the correct terminal on the new oem board, hit the power switch and the transformer starts smoking.

I pull the ground from the control board completely off the board, hit the power back on and it's all good, no humming and no smoke from the transformer and still have 29 volts on the low side, 123 volts feed.

But still no inducer.

I call Carrier tech support and we go through the wiring together. That's when I find that the 123 vot feed is not going into line 1 on the board but rather to the transformer and the blower motor, coming back to the board's L1. Somehow or another this worked for cooling mode.

Rewire everthing, included fixing a bunch of bare spade connections with stranded copper poking out all over the place, give the board it's 123 volts straight from the feed as well as the tranny for the low voltage, use the blue wire that was connected to the L1 on old board on cool terminal on new board and the red blower wire on heat terminal and it's all good.
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Old 11-02-2011, 04:52 PM   #20
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Carrier Control Board


New board.


Old replacement board that had nothing to inducer. Now I know why..
Note new spades on inducer wires. I had to cut the old ones off to test hot.


Continuity.

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Old 11-02-2011, 05:04 PM   #21
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Bare wire. I cut these off and put new spades.




After re-wiring it all correctly.


Flame on!


Done deal. Always interesting, no doubt.


All the spades I had to fix and I walked off with two apparently good control boards. Fair is fair.



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