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Model 58GS Carreir Furnace blower runs all the time

I have disconnected the thermostat Red & Green wire and the blower motor still runs when power is applied.

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  • George Fann Jan 21, 2009

    I found my problem to be the 24V Control Transformer. It was open.

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The blower relay on the circuit board is likely stuck closed. It looks like a black square on the board.

Posted on Jan 17, 2009

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I installed a run capacitor for my blower motor on my RUUD ac model UGPH10EBRJR. now it runs all the time. I even disconnected my thermostat and it kept running. is it my thermostat? or something else


An open limit switch may make the fan run all the time. Try disconnecting the Green wire @ the furnace...if that does the trick, then either the thermostat fan relay is stuck, or there is a short between the Red & Green wires somewhere in the thermostat wire.

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Goodman AC fan outside runs, no air inside


You will need a new blower motor if the blower motor is not working. First check to see if the main breaker on the breaker panel is on and 240 volt power is available. If you have a split unit and it is installed in the attic, check to see if the overflow pan is full of water. Find the green control wire and see if it has 24 volts applied to the control card. If 24 volts are available to the control card and the blower motor is not running, you need to call a professional to check the fan control card. If 24 volts is not available to the control card in the air handler, then it may just be a loose green wire in the thermostat or maybe you may need to replace the thermostat if you you can not get 24 volts to the green wire. You can take cover off the thermostat and try jumping a small wire by touching it from the red wire to the green wire. The voltage on the control is only 24 volts on most home units. If this is a commercial unit, be cautious. I have seen 440 volt on one control system. Any voltage >50 volts is considered dangerous and you should consult a trained professional to perform the troubleshooting.
Hope this helps

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1 Answer

Wiring color code for 58SCG-GB thermostat


typically thermostat wiring in pretty vague. red green yellow white. unless you have more than one stage of heating or cooling. heat is white (Y) RED is main 24V (R) YELLOW is cooling (Y) GREEN is G typically G will bring your indoor or blower motor on.

Mar 08, 2013 | Air Conditioners

1 Answer

Power up unit and thermostat, circuit board and gas valve smokes. checked transformer and its output is 24vac. this happened after a thunderstorm. blower works manually from furnace but not @ thermostat....


You have a short circuit, which is obviously dangerous. Your blower motor is controlled via a 24VAC control circuit, but is 120VAC. The circuit board and gas valve are probably history, but it needs to be troubleshot to determine the scope of the damage.If you remove T stat you will see several colored wires. The red and green wire when touched together should cause your fan blower to run. If that works when you bypass t stat the t stat is gone. The red to white will open your gas valve on your heater. The red to the yellow or blue will start your AC compressor or condenser fan motor. Be careful with the yellow and blue wires as one is actually a neutral and one goes to the AC contractor on your condenser unit contractor. Hope this helps!

Aug 02, 2011 | Air Conditioners

1 Answer

Need to know full low voltage wiring information to thermostat


Usually the Red wire provides 24v and connects to the R termenal-
Next the Green wire is to the indoor blower motor and connects to G terminal-
Next the Yellow wire is to the outdoor unit to call for cooling and will engage power to the contactor solenoid to pass 240v power to compressor and power to Start/Run capacitor and fan! It will connect to the Y terminal-
Next is the White wire an it calls for Hea and is connected to the W terminal-
If you have an Orange wire it is for the reversing valve of a heat pump system.
Remember the red feeds 24v to each of these colored wires to complete a connection and pass power to the device being called into action.
BLue or Black wire will be ground if the thermostat needs power instead of batteries.

Red wire is the only hot 24v wire going to the thermostat period! And it comes from the Transformer!

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1 Answer

Trying to figure out thermostat wiring diagham on a split system


Typical Thermostat Wiring for 4 or 5 wire Heat/Cool Thermostat (not heat pumps)
4 Wire Termostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
with one transformer for both units
Rc One Side of 24 volt Transformer
Rh Jumper Rc to Rh
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
With 2 transformers one for indoor unit
And one for outdoor unit
Rc = Red One Side of (outside) 24 volt (outside transformer)
G = Green Blower (outside transformer)
Y = Yellow Cool (outside transformer)
Rh = Blue One side of (inside) 24 volt (inside transformer)
W = White Heat (inside transformer)
COOLING ONLY Thermostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
HEATING ONLY
R or Rh One Side of 24 volt Transformer
W = White Heat

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1 Answer

Rheem Criterion II - blower works OK w heat or AC, not by itself


does the blower do anything? turn the power off and take the lead that comes off of the "cool" ( wire from the blower motor) and hook it up to the outlet side of the door switch ( the wire that comes off the door switch and goes to the board) turn the power back on and push the door switch in this will allow 110v to the blower if the blower runs the blower is good

reatach all door switch wire and blower wire to "cool"

disconnect all low voltage terminal wires at control board from thermostat make a jumper with a seperate wire from R to G if it runs it is your Thermostat or the wires inbetween the two

if it doesnt you probably have a burnt solder spot on the back of the control board and will need to replace the board

hope this helps

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1 Answer

Goodman forced air gas furnace not firing


if your power vent moter is not running you should not have have glowing ignitor.Frist the vent moter must close an air prove switch in series with the idnitor .seems you have a stuck air prove switch.Its the one with a hose attached

Apr 04, 2009 | Air Conditioners

1 Answer

What's the deal? Wont shut off or respond to thermostat. . .


Red= power........White=heat.............Green=fan.................(grey)-(yellow)=cool .....these are the connectons. Disconnect these wires from the thermostat and know that red/power is the only wire that send power to the thermostat, and the rest sends it back to the unit to call for whatever,, red--to . white for heat... red to green for fan .... &red to grey for cool! OK! Turn all your power on, and use a jumper wire from red / green for fan and see if the fan comes on! Then move the jumper wire from red to green , to red / to white for heat and the fan , wait for 3 minutes before removing and going to the next step. Then red /to grey for cool and check if the outside comes on. Either you have a wire touching past the insulations and making a connection, a bad thermostat ,oe excessive wire lead touching the next connection.Thank you very much!

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