Looking for part #

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Old 07-27-11, 09:28 AM
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Looking for part #

I have an American Standard furnace Mod#cdb100a945d3. I was having trouble with it over the winter with it continually shutting off. Had it worked on a couple of times and was finally told it needed the control board and it was going to cost around $600. I didnt have the money so just finished out the winter with space heaters. I would like to go ahead and replace this myself because I am sure I can do it for much less, but I dont know where to get the part# for it. Any help would be appreciated. Thanks
 
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Old 07-27-11, 09:33 AM
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Hi,

Look at where the control board is and get any brand and part # off of it. Someone can direct you to a replacement.

Do you have your manuals?

Mike NJ
 
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Old 07-27-11, 09:51 AM
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there are several different #'s on the bd. It says White-Rodgers in the middle of the bd. One sticker says made in Mexico 50a55-474 below that # is another one 156-4345 REL. There is another sticker that says D341235P01. Down the side of the bd is 4327-c
 
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Old 07-27-11, 10:03 AM
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Hi,

I am looking. I did find some conversion kit and I wonder if there was an issue.

First off though, on the control board when the unit cuts off is there any kind of code being thrown?? Blinking lights? red, green?

Let us know that first. Possibly others here can help trouble shoot. It may or may not be the board.....

Heres somthing I found but I need to investigate further.

http://hvac.amickracing.com/Furnace%...rs%20Guide.pdf


Here is the actual board.

Trane American Standard Furnace Control Board D330927P01

Mike NJ
 
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Old 07-27-11, 10:51 AM
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There was a blinknig red light and I did know how many blinks but I dont recall now what it was. I believe it indicated the unit was overheating. They first pulled out the coil where all the cooling fins are and they cleaned that then also replaced the limit switch but still had the same problem. I actually think there were 2 different limit switchs that were replaced. They showed me the back of the board where there were some very dark spots where it had overheated and that it was bad. I have already spent over $500 on it.
 
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Old 07-27-11, 10:54 AM
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I looked at the link you posted for the board and it looks totally different than the one thats in there
 
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Old 07-27-11, 11:40 AM
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Here is another link. Use the 50a55-474 # when searching.

WHITE-RODGERS 50A55-474 Control Board - Part-S-Mart

It could be other sensors or switches. Even though the board has a brown spot it can still be good.

Pressure switch? Thermal switch? etc.....

If you turn the unit on it should run through the ignite process if you turn it on heat. It will throw a code. Try in and tell us how many blinks.

Here is a actual list from a company. The picture may not be what you actually have. They often use universal pics. The catorgize your furnace.

http://www.white-rodgers.com/wrdhom/..._Unvrsl_SS.pdf


Found the code manual. Page 7 in this link.

If the failure is internal to the control, the
light will stay on continuously. In this case, the entire
control should be replaced, as the control is not fieldrepairable.
If the LED is continuously off, there may be no
power to the control; the fuse on the control may be open;
or there may be a failure in the control.


http://www.white-rodgers.com/wrdhom/.../0037-5800.pdf

Mike NJ
 
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Old 07-27-11, 12:10 PM
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My furnace wont even try to come on right now. They cut some wires and wired around something on the board they told me so my a/c would still work.
 
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Old 07-27-11, 12:36 PM
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I did go open the furnace and put the wires back together like they were and it will not go thru the ignite process. The board is just blinking a steady single blink
 
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Old 07-27-11, 01:31 PM
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Did you turn the a/c off and thrn the t stat to heat?

A steady binking green is normal so far. If it was the board it would stay on continuous.

The 50A55 control continuously monitors its own operation
and the operation of the system. The LED light on the
control will flash slowly (one flash per second) if there are
no failures and no call for heat. If there is a call for heat,
the LED will flash quickly (one flash per half-second). If a
failure occurs, the LED will indicate a failure code as
shown below. If the failure is internal to the control, the
light will stay on continuously. In this case, the entire
control should be replaced, as the control is not fieldrepairable.
If the LED is continuously off, there may be no
power to the control; the fuse on the control may be open;
or there may be a failure in the control.
If the sensed failure is in the system (external to the
control), the LED will flash in the following flash-pause
sequences to indicate failure status (each flash will last
approximately 0.25 seconds, and each pause will last
approximately 2 seconds).
2 flashes, then pause System lockout (no flame)/check
line polarity
3 flashes, then pause Pressure switch problem
4 flashes, then pause Thermal protection device open
5 flashes, then pause Flame sensed with gas valve off
6 flashes, then pause 115 Volt AC power reversed
7 flashes, then pause Gas valve circuit error
8 flashes, then pause Low flame sense signal
The LED will also flash once at power-up


Mike NJ
 
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Old 07-27-11, 07:52 PM
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I did turn the thermostat to heat and turned it all the way up but it didnt even try to come on.
 
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Old 07-27-11, 08:53 PM
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Possible t stat wiring heat side.. T stat????

Mike NJ
 
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