Help with pc board on basement a/c on 96 Winnebago vectra

Yeah, there is a source of the problem outside of those resistors UNLESS it was a one time thing... Approach the fix with caution, and if you fix it with resistors, test it WHILE WATCHING and don't just leave it on over night. I would totally test it for a while before trusting.

It is a very rare instance where a resister goes bad. Some other component has probably failed and caused excessive current to overheat the resisters. You could chase this problem for a long time by replacing parts but without a schematic and an understanding of the PC board's operation, it all may be a waste of time. Buy the replacement board and move on to other things that are more important.

Have you tried measuring the resistors with an ohm meter.

You need to find out why excessive current was going through them, enough so that they were overheated.

I'd suggest a new board as others have mentioned.

I replaced the boards on my roof top units, but then I had to buy a new thermostat.
Everything works fine now.

I don't know your model number ac unit, but I've had good success getting ac parts (including pc board for my basement air) from Makarios RV (www.makariosrv.com). Very fast shipping and, so far, everything I've ordered from them was the exact part number I needed.

I realize this does not answer your question and probably not want to you hear...A friend with basement air once the extended warranty ran out gave up on it and put two roof units on. During the three year extended warranty it paid over $2000 fixing it and when it broke again on his dime he gave up on fixing. Made it into a basement storage area when he threw it away.

Thank you all for the help. I have already removed the resistors and you can't tell what value they are. I know I could buy one but I've been out a lot of money on this a/c unit and actually I just finished putting in both blower motors and when I was hooking the wires up I noticed the burnt capacitor and resistors. When I bought the Winnebago the guy said it just needed the outside blower motor but anyone can tell you anything and he might've honestly thought that was all that was wrong. I know I'm trying to cut a corner and probably shouldn't after replacing everything else but really don't want to buy a new one unless I just have to. The previous owner had the one blower motor unwired and the wires were just dangling around in the unit so I thought maybe they could've touched and maybe blowed the capacitor and resistors. If that's not logical please chime in cause I have no experience with electrical repair.

rgatijnet1 wrote:
or, if you have to, purchase a new PC board from him.

This is probably your best bet.

Resistors typically don't just "go bad"......but burn out acting something like a fuse when some other active component fails and sorts out.

Or to put it another way, it is HIGHLY unlikely that the resistors are the only thing that has failed on the board.

I would go for a new board unless you can determine what caused the resistor failure.
The resistors may be just a symptom like a fuse.

Maybe final an electrical person to help you.

You might ask this seller if he could give you the info on the resisters, or, if you have to, purchase a new PC board from him. Coleman PC board