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-   -   Goodman GMS80453ana INOP (http://www.diychatroom.com/f17/goodman-gms80453ana-inop-77254/)

diynoobee 07-27-2010 01:19 PM

Goodman GMS80453ana INOP
 
Hello all,

First let me say that I am new to this forum and not to knowledgeable about HVAC systems. Anyhow I need some assistance on getting my unit up and running. I was having trouble with the controller board continually blowing the 3A fuse. A friend that said he knows about HVAC put in a 5A fuse, when this happened the unit will not even blow the fuse. I have replaced the controller board with out any luck. Looking at the diagram on the door panel I think it could also the step down transformer to the controller board. Well if anyone has any suggest, it would be most welcomed.

Thanks,
The Noob

beenthere 07-27-2010 05:04 PM

Probably burnt out the transformer when he used that larger fuse.

Use a meter, and look for a short in the low voltage wiring.

diynoobee 07-28-2010 01:20 PM

Quote:

Originally Posted by beenthere (Post 476247)
Probably burnt out the transformer when he used that larger fuse.

Use a meter, and look for a short in the low voltage wiring.

beenthere I just found that it was indeed the xformer. I at least now can turn the fan on. But when I try to turn no the AC the fuse pops open. Any ideas why.

Thanks!

P.S. Even the fan on the temp dropped 2deg.

beenthere 07-28-2010 03:58 PM

There is a short in the low voltage circuit of the outdoor unit.
Either in the wiring from the furnace board to the unit. Or in the circuit in the outdoor unit.

diynoobee 07-28-2010 04:28 PM

Quote:

Originally Posted by beenthere (Post 476841)
There is a short in the low voltage circuit of the outdoor unit.
Either in the wiring from the furnace board to the unit. Or in the circuit in the outdoor unit.


With that said, how do I a troubleshoot the low voltage circuit of the outdoor unit?

Thanks!!!!

beenthere 07-28-2010 04:37 PM

If you have a meter. Check for continuity to ground, in the wires.
if not. Remove the low voltage wires for the outdoor unit(writing down and or marking where they were connected). Turn power back on, and set stat for cooling. If the fuse pops, you have a short in the wire. if it doesn't then the short is in the unit.

Yoyizit 07-28-2010 05:52 PM

This will pay for itself pretty quickly
http://www.parts-express.com/pe/show...number=074-022

diynoobee 07-28-2010 05:53 PM

Quote:

Originally Posted by beenthere (Post 476875)
If you have a meter. Check for continuity to ground, in the wires.
if not. Remove the low voltage wires for the outdoor unit(writing down and or marking where they were connected). Turn power back on, and set stat for cooling. If the fuse pops, you have a short in the wire. if it doesn't then the short is in the unit.

Beenthere,

Ok used the meter to ground and there was no short to ground on either of the 2 wires that go from the control board to the outside unit. But the fuse doesn't pop with the 2 wires disconnected from the control board. I did however do a continuity check of the 2 wires together and it did buzz. Should there be continuity between these 2 wires.

The 2 wires are connected on the furnace control board from the outside unit are White which is connected the "C" and Red which is connected to the "Y" which shares the yellow wire from the thermostat.

Appreciate your continued support!!!!!!

diynoobee 07-28-2010 05:58 PM

Quote:

Originally Posted by Yoyizit (Post 476916)
This will pay for itself pretty quickly
http://www.parts-express.com/pe/show...number=074-022


You got that right!!!! been through 6 fuse during the trouble shooting process!!

beenthere 07-28-2010 06:48 PM

If the wires are disconnected on both ends. Then there should be no continuity.

If they were still connected to the outside unit. Then there should be continuity.

diynoobee 07-28-2010 07:52 PM

http:///www.goodmanmfg.com/Portals/0...S/SS-SSX14.pdf
Quote:

Originally Posted by beenthere (Post 476939)
If the wires are disconnected on both ends. Then there should be no continuity.

If they were still connected to the outside unit. Then there should be continuity.

Ok.. From outside the were connected. Not sure if I am reading the drwgs correctly but it looks like the Y and C are in series with a LPS, HPS and a coil. Y to HPS to LPS to Coil to C. You suspect that this circuit has an issue. I took the Y and C of the control board and did a continuity check to the HVAC unit (assuming that its grounded) but neither Y or C was grounded.

www.goodmanmfg.com/Portals/0/pdf/SS/SS-SSX14.pdf

http://www.goodmanmfg.com/Portals/0/pdf/SS/SS-SSX14.pdf

Yoyizit 07-28-2010 09:21 PM

Quote:

Originally Posted by diynoobee (Post 476081)
the controller board continually blowing the 3A fuse.
put in a 5A fuse, when this happened the unit will not even blow the fuse.

24 V/(>3 A) = <8 ohms
24 V/(<5 A) = >5 ohms

Normal is probably
24 V/(<1.7 A) = >14 ohms.

If your circuit fault impedance is between 5 and 8 ohms instead of more than 14 ohms or less than 5 ohms, you may need more than a continuity checker to find the problem.
The solid state components on the control board need at least 1 Vdc to begin turning on.

Can you post a link to your tester?

diynoobee 07-28-2010 09:32 PM

Quote:

Originally Posted by Yoyizit (Post 477018)
24 V/(>3 A) = <8 ohms
24 V/(<5 A) = >5 ohms

Normal is probably
24 V/(<1.7 A) = >14 ohms.

If your circuit fault impedance is between 5 and 8 ohms instead of more than 14 ohms or less than 5 ohms, you may need more than a continuity checker to find the problem.
The solid state components on the control board need at least 1 Vdc to begin turning on.

Can you post a link to your tester?

It's like beenthere said, if the fuse doesn't blow when the compressor is not connected its something from the compressor up to the control board.
http://us.fluke.com/fluke/usen/Digit....htm?PID=56135

beenthere 07-28-2010 09:38 PM

The coil of the contactor could be shorting to itself. And not have enough resistance.

diynoobee 07-28-2010 09:53 PM

Quote:

Originally Posted by beenthere (Post 477031)
The coil of the contactor could be shorting to itself. And not have enough resistance.


What is a good resistance... 8ohms?


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