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-   -   A/C, Fan , Gas Furance not turning on. Help Plz (http://www.diychatroom.com/f17/c-fan-gas-furance-not-turning-help-plz-188824/)

Rook775 10-19-2013 02:35 PM

A/C, Fan , Gas Furance not turning on. Help Plz
 
My AC, Fan, and Furance won't turn on.
Things I have replaced are
Control Board with exact same model
Safety switch for door
Transformer for unit

Things I have checked
I have 120v into transformer and 24v coming out
No lights on control board
I tried jumping wires at thermostat R to G, R to Y, R to W nothing happens
3 amp fuse on control board isn't blown
Breaker on the outside is not tripped(I turned off and on to reset)

Please help I don't know where to go from here

gregzoll 10-19-2013 02:55 PM

You most likely burnt up the board, with your checks.

Rook775 10-19-2013 02:58 PM

It's a new board and how would I burnt it without any smells or smoke . wouldn't the 3 amp fuse go out first?

gregzoll 10-19-2013 03:05 PM

Quote:

Originally Posted by Rook775 (Post 1255443)
It's a new board and how would I burnt it without any smells or smoke . wouldn't the 3 amp fuse go out first?

Not necessarily. Also not always does the "Magic Smoke" get released when things go bad.

Usually the first things you are going to check for, is it the thermostat. If the thermostat does not turn the unit on or off, then replace with another and see what happens. Check for power at the furnace & a/c or heatpump. If there is power, and the thermostat is still not turning on the furnace, then yes check the kill switch, to see if that is faulty.

Jumping across the terminals like you did, you most likely fried a chip, diode, resistor on the board in the furnace.

Lets go to the beginning. What led you to having to check why it was not starting in the first place. Was the board in the furnace showing any error codes on the LED? What manufacturer & model of furnace, along with same for thermostat.

Rook775 10-19-2013 03:12 PM

No led was lighting on the control board. I just replaced it because I got a good deal on one.
its a GMP100-3 Rev A
Control board is Goodman B18099-13 1012-933A

I have power to transformer 120v and 24v coming out. I have 24v at the board as well.
Thermostat is Carrier TSTATCCPQ501

yuri 10-19-2013 03:21 PM

where exactly did U get the board. Brand new in a sealed pkg from Goodman or e-bay. Lots of those boards can be used etc. That board if not grounded properly will blow. The bracket it mounts to on the fan comes loose and it loses grd and blows. Have to tighten the bracket and put extra screws in it to the fan housing to keep it tight.

gregzoll 10-19-2013 03:22 PM

If there was no LED or power indicator on the board, then there is other issues at hand, why there is no power getting from the transformer, to the board. See this thread from 2006 http://www.diychatroom.com/f17/goodm...-furnace-1643/ See this thread from 2011 http://www.diychatroom.com/f17/goodm...orking-124936/

Rook775 10-19-2013 03:25 PM

I got it used off ebay, I still have the original board too. I had heard that as well and checked to make sure it is not loose and it wasn't, screws are making good contact.
If it is a blown board how can I verify this?

yuri 10-19-2013 03:28 PM

You cannot. Get a new OEM board. Then add some extra screws to that bracket where it mounts to the fan. I also will run a green ground wire from that bracket to the ground line of the 120 volts supply to make 100% sure it is grounded.

Rook775 10-19-2013 03:36 PM

So your saying if the ground is proper and the power is gong to it the red light should just stay on? instead of it being off?

yuri 10-19-2013 04:03 PM

Yes....

beenthere 10-19-2013 06:00 PM

A used board from Ebay, is often a board that was abused when as it was ripped out of the old furnace it came from.

Before you go investing a lot of money in replacing boards in your that GMP. Pull the blower out, crawl into the blower compartment. Either use a mirror, or stick your head up in the opening to the heat exchanger. And look for loose crimp rings laying on the base. That model is Known for popping them. if you find any, or see any are missing, then the heat exchanger is shot. Replace furnace.

ben's plumbing 10-19-2013 06:49 PM

never never did I say never ....purchase used control boards for any type of furnace off e-bay..always buy them new...ben sr

ben's plumbing 10-19-2013 06:52 PM

hey rock if you do purchase a new board ...read precautions in "electrostatic discharge section of instructions...ben sr

HVAC1000 10-19-2013 07:01 PM

5 Attachment(s)
Quote:

Originally Posted by beenthere
A used board from Ebay, is often a board that was abused when as it was ripped out of the old furnace it came from.

Before you go investing a lot of money in replacing boards in your that GMP. Pull the blower out, crawl into the blower compartment. Either use a mirror, or stick your head up in the opening to the heat exchanger. And look for loose crimp rings laying on the base. That model is Known for popping them. if you find any, or see any are missing, then the heat exchanger is shot. Replace furnace.

Been, speaking of those GMP going bad look at this one I had about a year ago. The HX is literally full of rust and when I removed it, it started dripping water. Worst one i have seen, so far.

This is once I removed the collector box
Attachment 77007



Attachment 77008

This is it sitting outside and leaking water that was already inside of it when I got there


Attachment 77009

Attachment 77011



And the secondary HX was just as bad


Attachment 77010

Now whenever I see an GMP I get edgy and always check the heat exchanger


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