Question about Goodman GMS90703BXA Heater

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Goodman high eff. furnace..does run when jumped r and w terminals...any idea where to look for wiring problem??

That's the right number...ac runs great...jumped r&w...unit works fine...wiring problem..where??

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  • fishrays Oct 26, 2012

    The problem is that the 3amp fuse continues to blow when heat unit is switched on. All tstat wires disconnected at furnace and jumped r&w terminals. Unit fired up fans came on. Reconnected wires, fuse blows before fan even starts. I traced tstat wires to tstat and outside AC unit, rechecked wiring of tstat, replaced tstat and still fuses blow. I am about to ck. the limit switch for continuity. Any advice will be appreciated..tx

  • fishrays Oct 27, 2012

    Tried this test...unit did run when r&w was jumped at wall..attached the tstat and fuse blew...this was a new tstat like the one that has been working(Honeywell RTHL111B from Lowe's. Any recommendations to replace this one. I did make the recommended settings for this Goodman unit. Also, I checked the transformer and did not get a meter reading on the 24v side. Should the door (unit) switch at the cover be engaged when making the 24v ck? Tx for your help.

  • KD Grayson Heating,Air conditioning & Refrigeration

    You are putting the hot leg of 24 volts on your 24 common/neutral leg, which is a direct short, Red to Common on the transformer, try the stast with the C or Common 24v leg off, just wire red and white, the fuse blows if red touches common before a load, in other words imagine a extension cord with the female end cut off and the 2 wires stripped 1 inch back exposing the coper wire, touch them together and its a short , However put a load as in device in between the wires ad connect them to the device and all is fine, every circuit must have a load, a device that has resistance to power.

  • fishrays Oct 31, 2012

    Bless you KD G!!!!! now the heat is working, the tstat is operating like it should and I still have the blue wire disconnected at the stat..should i just leave it off??

  • fishrays Oct 31, 2012

    yep, I have found my problem!!! This tstat only calls for 4 wires and does not require a blue/common wire, duhhh!! Tx for helping troubleshoot this situation...I'm a happy camper now!!

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I see no problrm? what is wrong?

Posted on Oct 26, 2012

  • KD Grayson Heating,Air conditioning & Refrigeration

    Ok, if the unit runs with the low voltage wiring off the low volt terminals,
    and jumping R to W works fine until you rewire the stat, I would remove the stat and jump R to W at the Tstat end, not the tstat itself, remove the tstat and try it.
    If it runs fine the stats bad, if not the wirings bad.

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Posted on Jan 02, 2017

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Therinnaiguy
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SOURCE: Goodman furnace I think

Ok, a flashing 3 on a Goodman control board usually means that the pressure switch is tripping. A few things will cause this. One being a restriction in the exhaust or combustion air inlet. The second could indicate a faulty inducer blower motor and the third would be a blocked or bad pressure switch.
 
With the front cover off and door switch taped down, Have a helper turn the thermostat up to 75. You will be watching the circuit board for flashing lights and in a few seconds the inducer motor (the small fan hooked to the exhaust) will start. If this does not happen, we either have a bad circuit board or blower motor. If the fan starts rotating, inspect the hoses going to the small circular pressure switch. Sometimes they may get either water or debris in the hose and not allow the switch to sense pressure. If the hoses look OK, the igniter will glow an orange color and you will see this if you look thru the small viewing port. IF no glow, you could have a bad pressure switch, a bad ignition relay (found on the circuit board) or a bad igniter. OK so if the igniter glows, a few seconds later the gas valve should click open and send gas to the burners. The orange will turn to blue. If this does not happen, you have either a bad gas valve or bad circuit board. Finally if you get flame but it will not stay lit more than a few seconds, you may have a restriction in the burner gas train, a bad gas valve, a dirty or bad flame sensor or not enough gas pressure.
 
Knowing the sequence of operation will give you the needed information to talk with a service technician and cut down on diagnostic costs.
 
Try looking on the back of the furnace access panel for both model number and a diagnostic schematic. This will confirm what the flashing 3 code means for your unit.
 
Sorry, without knowing the model number, this is the best I can do for you. Good Luck!

Posted on Oct 29, 2007

  • 29 Answers

SOURCE: Goodman furnace

double check your wiring. R terminal on the furnace will provide 24 volts to the t-stat. W terminal in the t-stat will send 24 volts back to the furnace W terminal to turn on the heat. G terminal in the t-stat will send power to the G terminal in the furnace when the t-stat is switched to fan on. Y terminal in the t-stat will send power to the Y terminal in the furnace which in turn will send 24 volts to the A/C outside. The C terminal in the furnace should be connected to the c terminal in the A/C outside as well as to the T-stat. Check the fuse again

Posted on Jun 21, 2009

  • 80 Answers

SOURCE: how does a 95% goodman gas furnace wire up with

A picture is worth a thousand words. Check out this link for the best explanation.
http://www.alpinehomeair.com/related/diagrams_10.pdf

Posted on Oct 07, 2009

Therinnaiguy
  • 1420 Answers

SOURCE: common terminal location on a goodman furnace

White wires are commonly the common connection (sorry for the pun). L2 is also considered the common leg. You did not mention if you are looking for high voltage or low voltage common. L2 is your high voltage leg. If the power venter ties into the thermostat circuit, W on the circuit board is the common terminal.

Posted on Dec 01, 2009

  • 1 Answer

SOURCE: Furnace runs on utility power but not on back up generator power

Using the Hz meter you can adjust the governor throttle screw to raise or lower the engine speed
to get an optimum 60-62 Hz setting. You may want to load your generator with the most
common load you will be using and then adjust the screw to give you an adjustment within the
60-62 Hz range. If you set it too high, then it means you are running the engine faster than
need be and will add to premature or serious engine damage to the internal parts. It is
mechanically governed to maintain the proper engine speed once it has the standard setting in
place. Do not attempt to adjust this governor throttle adjustment screw without the proper tools
available. You can not do it by ear! If you do not have a Hz meter or tachometer available, then
you can use a conventional electric clock with a sweep hand for seconds. If you plug the clock
into the generator, a proper engine speed would make the clock do a minute in exactly 60
seconds against any other timing device. If the clock takes longer to do a timed minute, then the
engine speed is too slow and you need to raise the engine speed; turn the governor throttle
screw clockwise. On the other hand, if your clock does a minute in less than a normal clock
minute, then you need to lower the engine speed, turn the governor throttle screw counter
clockwise. Now you should have a good setting for your generators frequency setting. It is best
to do a frequency setting before doing any voltage adjustment.
I did this today and my Goodman fired right up after two days of frustration!

Posted on Dec 07, 2009

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