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Old 10-13-2011, 03:16 PM   #46
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Inducer Fan Not Turning On


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Originally Posted by Patrick Eubanks View Post
for the love of all things holy, you got your answer 150 replies ago. Get a new inducer assembly, not just the motor. The visible blades turning from the rear have nothing to do with the impeller (air moving device).
If you have 120 volts going into the motor and its not running, its the motor
At no point is there voltage going to the motor and the motor does not come on.

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Old 10-13-2011, 06:32 PM   #47
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Inducer Fan Not Turning On


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Originally Posted by Deemar View Post
At no point is there voltage going to the motor and the motor does not come on.

Then how can you suck on the pressure switch hose and then have the inducer stay running?
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Old 10-13-2011, 06:55 PM   #48
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Inducer Fan Not Turning On


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Originally Posted by Doc Holliday View Post
Then how can you suck on the pressure switch hose and then have the inducer stay running?
When I suck on the hose, voltage is somehow sent to the inducer and keeps sending to it after I stop sucking. What I'm saying is anytime voltage is sent, the inducer comes on.
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Old 10-13-2011, 07:34 PM   #49
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Inducer Fan Not Turning On


http://www.asi-heating-airconditioni...e_Inducer.html

http://www.hvactechsupport.com/furna...r_Will_Not_Run

scroll down to draft inducer section.
http://arnoldservice.com/Troubleshoo...g_Problems.htm
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Old 10-13-2011, 09:35 PM   #50
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Inducer Fan Not Turning On


I read through those, the only part I found odd was the first link:
Quote:
When a gas furnace heating unit has 24 volt power applied to the “W” terminal at the furnace and the negative side of the circuit is present ion the “C” terminal (usually this is wired to ground or some metal part) the unit will start the heating sequence.
Is this referring to the C in the thermostat wires? I have C G Y W R on the thermostat and the same on the control board. Nothing is wired to C on either of them. Should something be? It wasn't in the past and this was working last spring.

Also I put the multimeter on the W wire on my control board and it's getting 28 volts when I flip the breaker back on and it tries to start up. So voltage is going to the board from the thermostat, why wouldn't it be going from the board to the inducer?

Last edited by Deemar; 10-13-2011 at 10:51 PM.
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Old 10-13-2011, 11:28 PM   #51
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Inducer Fan Not Turning On


I found some more troubleshooting on Google which reads:

Quote:
Find the blower relay, one side of which is connected to the thermostat. Set a multimeter to the 50 volts AC range. Put one of the leads on the terminal labeled G - this is one of the blower wires. Put the other one on C which is one of the transformer terminals. Set the thermostat as high as it will go. The furnace should light, the meter should read about 24 volts, and the blower should start up in a few seconds. If not, replace the thermostat.
The furnace doesn't light, the meter reads 0 and the blower does not start up in a few seconds. I replaced the thermostat with a much cheaper, much simpler one that was also working previously (older one I used to use) but I still get the same symptoms. Nothing changed.

Quote:
Turn the power to the furnace off at the circuit breaker box. Set a multimeter to the ohmmeter setting. Put the leads on the relay's G and C terminals again. The readout should be 0 when you touch them and 1 when you separate them. If not, the relay is faulty. Label the wires so that you know where each one goes and then remove and replace the relay.
If it's talking about the thermostat wires on the control board (C G Y W R) then I tried this and it always reads 1, it never changes to 0. How do I change a relay? Where is it?
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Old 10-14-2011, 12:33 AM   #52
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Inducer Fan Not Turning On


You do realize that all 115 volt motors you can simply wire straight to see if it comes on, don't you? Use the main power going to the furnace and wire it straight to the inducer blower motor, black to black and white to white. Cap the ground on the incoming, you don't need it for this test. Flip the breaker back on (obviously you need to turn the breaker to the furnce off before unwiring the furnace) and if the inducer motor comes on then we know it's not the inducer.

We do this all the time, very helpful diagnostic "tool".
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Old 10-14-2011, 12:36 AM   #53
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Inducer Fan Not Turning On


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Originally Posted by Doc Holliday View Post
You do realize that all 115 volt motors you can simply wire straight to see if it comes on, don't you? Use the main power going to the furnace and wire it straight to the inducer blower motor, black to black and white to white. Cap the ground on the incoming, you don't need it for this test. Flip the breaker back on (obviously you need to turn the breaker to the furnce off before unwiring the furnace) and if the inducer motor comes on then we know it's not the inducer.

We do this all the time, very helpful diagnostic "tool".
Where's the wires for the main power going to the furnace? What do they look like?
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Old 10-14-2011, 12:53 AM   #54
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Inducer Fan Not Turning On


Quote:
Originally Posted by Deemar View Post
Where's the wires for the main power going to the furnace? What do they look like?
Uh oh.




It looks like electrical wire. The white rubber cased wire coming into the furnace on top, next to the metallic flex gas line to the left, is called romex. In that romex are the hot (black), neutral (white) and ground (bare) electrical wires. This romex electrical wire could be entering the furnace on top as in the pic of this system I worked on yesterday or it could be on the bottom. It could even come in through a side.

All you are doing by wiring it hot is bypassing all system control componentry, the control board and the stat, and giving it a straight feed to see if it comes on. All a control board does is send that same voltage to the inducer via the stat.

Btw, you may or may not have a light switch by your furnace where the wire comes from the electrical service panel and then through and then to the furnace, If you do then you can simply turn that off to kill the power to the furnce instead of the breaker but make certain it is the right switch first.
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Old 10-14-2011, 01:03 AM   #55
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Inducer Fan Not Turning On


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Originally Posted by Doc Holliday View Post
Uh oh.




It looks like electrical wire. The white rubber cased wire coming into the furnace on top, next to the metallic flex gas line to the left, is called romex. In that romex are the hot (black), neutral (white) and ground (bare) electrical wires. This romex electrical wire could be entering the furnace on top as in the pic of this system I worked on yesterday or it could be on the bottom. It could even come in through a side.

All you are doing by wiring it hot is bypassing all system control componentry, the control board and the stat, and giving it a straight feed to see if it comes on. All a control board does is send that same voltage to the inducer via the stat.

Btw, you may or may not have a light switch by your furnace where the wire comes from the electrical service panel and then through and then to the furnace, If you do then you can simply turn that off to kill the power to the furnce instead of the breaker but make certain it is the right switch first.
Cool, how do I access the wire? I don't want to strip the jacket back nor do any cutting. The other end seems to have a metal tab on it that plugs into the control board and wouldn't connect in any way with the motor wires. Do I need to insert a piece of wire between them?
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Old 10-14-2011, 01:10 AM   #56
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Inducer Fan Not Turning On


You pull the service panels off of the furnace, the doors. The furnace itself will have it's own wires, connected to the control board, coming through the door switch, that the incoming romex will be wire nutted to. Most likely this connection will be in a box small metal box in the furnace. You disconnect those wire nuts and pull the wire over to the inducer motor which you'll have to unhook from the control board and possibly strip the terminals off of so as to wire nut them to the incoming main power wires. You may have to pull the incoming wires all the way out of the furnace so that they reach over to the inducer. Remember, the door switch and all will now be bypassed and the inducer will be controlled ONLY by way of breaker or light switch.

Just remove the doors and trace that wire down. You can't miss it, it'll stare you in the face.
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Old 10-14-2011, 01:16 AM   #57
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Inducer Fan Not Turning On


Concerning a previously mentioned question concerning a wire on a common terminal, you do need one for cooling mode. It attaches directly to the outside condensing unit, but not for heating mode.

Now if you don't have cooling and only heating then this message will self destruct in five seconds.
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Old 10-14-2011, 01:31 AM   #58
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Inducer Fan Not Turning On


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Originally Posted by Doc Holliday View Post
Concerning a previously mentioned question concerning a wire on a common terminal, you do need one for cooling mode. It attaches directly to the outside condensing unit, but not for heating mode.

Now if you don't have cooling and only heating then this message will self destruct in five seconds.
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Old 10-15-2011, 05:13 PM   #59
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Inducer Fan Not Turning On


Got someone coming to look at it Tuesday, can't come fast enough.
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Old 10-15-2011, 05:21 PM   #60
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Inducer Fan Not Turning On


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Originally Posted by Deemar View Post
Got someone coming to look at it Tuesday, can't come fast enough.
can't wait to see what was the issue.....inducer, pressure switch or controller board.

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