Question about Goodman GMS90703BXA Heater

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Connection Just installed the heater furnace but do not know where to connect the wires from the central air conditio unit outside.

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Re: connection

What do you have for wires from the outside unit? Tell us what colors coorispond to what terminals they are connected to outside.

Posted on Sep 18, 2007

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To much air flow..3ton blower..can i slow this down..i know its adjustable..ii hope down..what speed do they come from the factory

Should be able to slow down. Inside bottom door of furnace there are 4 or 5 wires, connected to board and blower motor. White is common. Red is slowest, then orange, blue, black fastest.
1 of these wires should be connected to Air Cond tap, one to furnace tap and 2 to unused taps.
If you are currently running furnace, connect red wire to heat tap. Make sure unit does not get to hot. Should be able to hold hand on Metal duct above furnace without getting to hot. Temp coming out of furnace should be around 35 to 60 degrees higher than temp coming into furnace. Actual heat rise temp is listed inside top of furnace rating tag.

Jan 17, 2011 | Goodman GMS90703BXA Heater

1 Answer

Connect my 24 milivolt gas (between the studs) wall furnace ( in my hall) to my thermostat that operates my electric heat central unit. problem: to sync both units to give home more balance ( hall is...

the first problem is you need a milli-volt t-stat and your central has a 24volt t-stat if you connect the 2 it will fry the controlls in the wall heater the second problem is t-stat location if the wall heater is near the central heats t-stat it will shut off the central to soon . maybe relocate wall unit to coldest room ?

Nov 16, 2010 | Honeywell Heaters

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I have a heating unit and trying to wire thermostat got 2 white wires, a red and a clear. where do they go

Hi, with just a heater and no air, the red would be the hot wire which goes to the R terminal on thermostat and clear which are normally white will go to W on the stat. If you have a heat only stat, it should have only the R and W connections. If a central heat and air stat, wire it the same, but you may need a third wire for the fan if it is forced air. You would be better off running down to the hardware store and getting a 24 volt heat only stat. I don't know what kind of heater you have, but make sure of the control voltage of the unit. Most gas, heat-pumps, gas & electric are 24 volts ac. Some heat only units are milivolts. Anyway, connect the 2 as I have said. Before you wire the 2 wires to the stat, touch the 2 together and watch to see if it fires up. It may have a delay, but should fire right up if the heater is working right. No danger of shock as this is very low voltage, nothing to worry about when testing. If it is a central type gas furnace, the voltage will be 24 volts. Please rate me on this as I know you will be kind. I chose not to charge you for my time on this thread. Keep me posted.
A/C, & Heating Contractor

Oct 22, 2010 | Heaters

1 Answer

Hi Proper way on wiring furnace.

I can give you a start, For heat only, R terminal on furnace to Red wire to R or RH terminal on thermostat. W terminal to White wire to W terminal on thermostat. G terminal to Green wire to G terminal on thermostat. This will get you heat but not air conditioning.

Jan 06, 2010 | Goodman Heaters

1 Answer

Does the lennox g14q3-80-c1 have to have the air intake from outdoors? i recently had a tankless water heater installed and the installer removed the air intake from outside to vent the water

Yes, it needs to vent from the out doors. I dont understand why they would have removed the air intake (flue) from the unit. Especially in the Furnace room where the heater will be producing gases of its own and that can be dangerous. Check with Lennox or call back out the Install manager of the company that installed this unit. Unless where you live there is code to say that it can vent from in doors. But in California it has to vent outside

Jan 03, 2010 | Heaters

1 Answer

No heat after installing honeywell thermostat H8110U

hook up the blue wire in the furnace cabinet where the blower section and the other thermostat wires are connected to the furnace. the thermostat you have uses a common wire from the thermostat to the furnace and this needs to be hooked up in the furnace otherwise you will have the problem you are having.

Dec 07, 2009 | Honeywell Electronic Programmable...

1 Answer

I have outside Goodman-Janitrol furnace and air unit and

two things to try first to get you pointed in the right direction. First disconnect the R or RH wire from the T-Stat. If the furnace turns off (Stops firing w/ fan to turn offabout 90 sec. later) then you more than likely have a bad Thermistat. If it continues to run Pull the R wire from the Furnace circuit board. put door back on furnace if it stops you have a short in the wire. Still Running? Most likely a bad curcuit board. Hope this helps.

Oct 12, 2009 | Goodman GMS90703BXA Heater

4 Answers


I just replaced a thermostat on a york furnace model gy9s100c16up11h. During the process i connected the red and white wire and the unit came on after making the connections it will not come on even if I jump the red and white wires without the thermostat. Thanks Dan 

Jun 10, 2009 | Heaters

2 Answers

Goodman GMP100-5 Rev Furnace Manual

I don't know where you are located, but there is a Goodman distributor in Sacramento, CA. Also in Ontario CA. They are a distributor so they may be able to help you or tell where to find someone who will help. Goodman is also known as GMC or Janitrol.

Jan 07, 2008 | Goodman GMS90703BXA Heater

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