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Inducer motor starts and stopsin1 second before any call for ign

Model UGRA-07EM4ES

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Check your presure switch

Posted on Jan 31, 2009

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My carrier model # 48ss-036100331 induced-draft motor will not start


On some of those inducer motors there is also a capacitor in the blower compartment on the left side of the burner section. It is possible that if you have 230v coming from the board CM terminals and if the motor is new maybe you have a bad capacitor in the blower section. Follow the wires to the capacitor and check microfarad reading to that capacitor. Caution there maybe 2 in this area but one is for the indoor blower motor and the other will be for the draft motor. The blower capacitor may be somewhere between 10 or 15 mfd but the draft inducer capacitor will be around 3 mfd. hope this helps

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What is the AFUE of my Rudd Achiever 90 Plus with model number UGRA-07EMAES


Per Rudd's website and also as the name implies, the min rating is 90. The 90+ can be as high as 93 but is stated as "plus" to cover the many possible installation scenarios which will impact overall efficiency of the unit.

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1 Answer

Model m1mc 090a bw furnace pressure switch open. inducer motor is pulling .45 w.c . the intake pipe above inducer is only pulling .1 w.c. . checked for venting and intake blockages found non. removed...


did you check the hose from the inducer to the pressure switch? HAVE you unplugged the unit from the wall outlet to reset the board? DO you have a voltmeter? If you do you can run voltage across the switch and if you get 24 volts you are open.

Oct 23, 2013 | Coleman Intertherm Nordyne Miller Furnace...

1 Answer

My furnace just quit a while ago. The Draft inducer motor blower make alot of noise when it trys to start and then it shuts down. I actually had to turnthe blower with a screw driver first before it...


Hello, if the inducer motor is bad then the furnace will not continue further and work, it could be that the bearings are shot on the inducer or it has failed electricly. Best thing to do here is replace the inducer motor.

Mar 25, 2011 | Air Conditioners

1 Answer

Hello there, I have a Goodman GMH951155DXAC furnace that I got in 2007. I have the following problem for the last 4 years: When the thermostat calls for heat the induced draft motor comes on and 30-40...


With furnace OFF ,Disconnect the top of the hose that leads to the
Bottom of Daft inducer Box, Now blow into it water will come out
of the drain hoses "condensation " this will shut the unit down if not drained. There must be a Trap on the side of the Furnace with water in it , to have positive presure to suck out condensation. This will fix problem. some installers forget to install this Trap that comes with Unit.....!!!! A little item
that will shut the whole system DOWN. :o)

Jan 06, 2011 | Goodman Air Conditioners

1 Answer

I have a Rudd furnace model UGRA-04EMAES in heating cycle inducer makes pressure switch ignitor lites up no gas pressure i rplaced gas valve and board still no gas. Wat next?


Well first you want to verify that there is gas pressure coming from the connector. Turn off the valve and disconnect the connector. Then turn on the valve for 1 second and back off. You should get plenty of gas flow. Be careful doing this!. Then inspect the opening at the adapter to the control. There is a screen inside there. Make sure the screen is clear(not plugged with pipe dope,lint ect). When the igniter reaches the 2200 degrees you should hear the gas solenoid valve click open releasing gas. If you hear it click and no gas is released you will need to inspect the burner orfices. The orfice has an extremely small hole and there is a posibillity that they are plugged with debris. You will need to use a very small wire(like a tie strap) and insert it into each hole and see if there is anything in the orfice. If you do not hear the gas valve click then it might not be getting the signal it needs due to a weak igniter or flame rectification sensor. Does your furnace have a stand-by pilot that is lit by the hot surface igniter or does the igniter directly light the burner assembly?

Feb 20, 2010 | Air Conditioners

1 Answer

Trying to determine whether I have a bad Ign/Lockout or inducer relay board on Mod 58SXA080-GG. If I shut off heat at t-stat or unplug ign mod. for 10 min. It will usually intiate a heat cycle but I only...


The inducer blower will put a vacuum on your pressure switch which in turn will tell the board to apply power to the ignitor. If you have a vent blockage, dirty air filter, plugged condensate line or any blockage of either vent or air intake, the furnace will lock-out and flash an error code on the circuit board. If after inspecting all the above for debris and found nothing, you can quickly jump the pressure switch after the inducer starts to see if the ignitor glows. You could also have a bad ignitor. Yes the lock-out is normal. Looks like you discovered the cause on your own, order a new switch.

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1 Answer

Bryant furnance clicking, won't fire


try checking the pressure sensing switch,it has a tube that should run somewhere close to the inducer fan.sometimes this hose fills with liquids,and makes the units act funny.I don't know if you have a condensing unit or what.the furnace wont try to light if it cant tell the inducer motor is running.any induced draft unit will work this way.you can also do a temp. bypass of the pressure switch to make sure the contacts on it are closing just be sure your inducer fan is running,and you cant leave it like that its just a test.that is a safety feature you really need.

Mar 11, 2009 | Air Conditioners

2 Answers

Janitrol/Goodman GMP075-3 Draft Inducer Fan Won't come on


most forced draft fans are powered by 120 volts . close to the fan is usually a plug that unsnaps. create a call for heat after turning off to clear safetys and see if your getting 120 to fan on initial call for heat. if you are then fan draft motor is bad, usually sold as an entire assembly replace exact as it came out. sequence of operation is..... stat calls for heat via common and white wire to furnace , 24 volts. ......board sences call and sends 120 volts to forced draft ........ motor runs and creates pressure on proofing switch,....... switch closes 24 to board and tells it draft fan is on......... board then energizes ignitor,....... after ignitior glows gas valve is opened and burner lights ........ either ignitor or seperate sensor rod tells board the burner lit........ and a few minutes later the fan comes on and hot air is blown out. if a step is missed or doesn't proof the furnace either trys up to three times to light or locks out. turning off power usually resets safetys and it will resume attempts to lite normally.

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