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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


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1) Shut power to furnace off, take panels off furnace.
2) Bottom part of furnace find the thermostat wires and make sure they are not touching each other where they connect control boards. You Should see Terminals R,G,W and Y.

3)This is a typical wiring if done by technician.
R=Power-should be red wire
W=Heat-should be white wire
G=Fan-should be green wire
Y=Cool-should be yellow or blue wire.

4) Disconnect the G terminal which is the fan leg and move it out of the way. Turn power on and turn thermostat up. The fan should not turn on until after the burners turn on. The fan should cycle off about 60secs. after the burner turns off.

5) If all of this happens make sure the wires at the thermostat are wired the same at the furnace Red to R and Green to G.
The color of wires you have may be different. But if the same colors are connected at the same terminals at the furnace and the thermostat, that is all that matters.

6) If you recently changed the thermostat, make sure the Rd or R terminal wire is not touching the G terminal wire at the thermostat.

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I am trying to install a RTH2310 but I do not know where the wires go. Brother in law took old Thermostat off and did not write down where they go. I have a white wire, a red wire and a green wire. Back at...


In most cases, the wires are used as this: Red=Power, White=Heat, Green=Fan/Blower Motor, Yellow=A/C. The other wires, like the one hooked to the yellow will be the condenser wires going outside. The thing I'm not sure on, is that Honeywell Thermostats usually have the terminals marked with R,W,B,G,etc. If it does, then the wires will be as color coded and just hook them back up that way. You can also test to see if those wires are what they are supposed to be by jumping the wires. You can start with red since that is supposed to be your 24v power. Jumper red and green, you should get the blower motor on, jumper the red and white, you should get the heat to come on. Same goes for a/c as explained above. Any other questions, I will be glad to help.

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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
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5 Wire Thermostat
with one transformer for both units
Rc One Side of 24 volt Transformer
Rh Jumper Rc to Rh
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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
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What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

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1 Answer

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1 Answer

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