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Induced draft motor

NO HEAT----I have a Bryant 350MAV furnace and the induce motor fan broke. Is there a way to bypass this till tomorrow when I can get a replacement?

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  • mnflash Mar 09, 2009

    Thanks dwkcool, that's kind of what I thought. At least it's not 20 below this weekend ust need to thow another log on and curl up with the wife till Monday morning.

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The inducer motor is what takes the cabonmonoxide out of the house from the unit and should not be bypassed

Posted on Mar 08, 2009

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Dwkcool is right! And even if you by pass it it will most likely over heat and cause another problem. then you have to trouble shoot that down.

Posted on Apr 06, 2009

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Posted on Jan 02, 2017

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Carrier infinity furnace 2010 has stuck inducer pressure switch, Can I manually bypass and heat the house until serviceman arrives tomorrow?


I wouldn't bypass any safeties when its part of the exhaust system of the furnace. That is the first safety that acts in the furnaces sequence of operation. The induced draft will initiate and that pressure switch will close, proving the IDM is working and flue is clear. It's primary purpose is to exhaust any fuel that may linger inside the heat exchanger and then to reject the post combustion process. Carbon monoxide becomes an issue. As far as the Infinity, these units will not start if safeties are bypassed. The unit checks all safeties/circuits for continuity, and if a switch is closed when its not supposed to be, it won't allow.

Mar 05, 2017 | Carrier Heating & Cooling

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Heater check out list for heater failures


Almost all furnaces built after 1978 have intermittant type pilots.
Ca banned them requiring electronic spark or hot surface ignitors, followed by induced draft motors, pressure switches or centrifigal switches that "prove" a induced draft exists, allowing the pilot sequence to commence.
electronic spark type units have a high voltage low amperage spark that is AC. Fire rectifies electricity that passes through it meaning AC becomes DC ! Fire is a terrible conducter however as a result , the DC signal is only milliamps/volts signal strength. the DC prescence is proof a flame exists for pilot, and safe to commence to mainburners.

As long as pressure switches stay closed, safeties and limits stay closed
and the DC signal to the ignition module is not broken, the furnace will run.

The normal sequence of operation is upon a call for heat from the thermostat a 24 volt signal is sent to W white (heat circuit) at the low voltage terminal board on furnace.
from there depending on unit and age the heat circuit may include a circuit board, but it still has the typical limits and safetys reqired for operation
its just not using electromechanical relays to control fan and induced draft motor etc.

for the induced draft to begin ,all limits, safetys in heat circuit must be closed.

induced draft begins and a proving switch, either pressure or centrifigal close allowung the pilot to begin, a spark or hot surface ignitor is energized and a pilot flame established,modern types use flame rectification to prove a flame, older Carrier, Payne,types have a 3 wire switch in the piloyt assembly that is a bi metal that expands and contracts clicking open and shut, allowing pilot or main burners, depending if cold or hot.

pressure switches are attached with tubing to the induced draft wheel housing and sense pressure differential and close upon induced draft running, the orifices that the tube attaches to on induced draft housing often plugs or is restricted causing pressure switch to fail to close, or waver on open and close , open , close, .

if you can run the fan in the on postion , you have both high and low voltage to the furnace.

if you dont have fan control check power, breaker , fuses.

on Dec 04, 2009 | Heating & Cooling

1 Answer

How do I wire a induce fan motor


Induced fan motors on older units are wired through the high limit safety on the stack - in series. When the furnace calls for heat, the induced fan motor comes on and after a time the furnace will light.

Older units have a temp switch in the stack that rotates to bring on the burners and blower motor. . When there is a call for heat, the induced draft fan motor comes on and then the burners will light.

After the heat exchanger is warmed up the limit switch will bring the blower motor on. That's basically how it works - there are two circuits - one for the induced draft motor and the burners and the other for the blower and high limit.

New units have a plug on the board you just plug in.

A

Oct 04, 2014 | Heating & Cooling

1 Answer

Fedders gas furnace exhaust fan comes on but will not ignite


The induced draft motor you describe has a pressure switch proves the induced draft motor is running, it is about 4 inches across and silver and flat and round, it has 2 wires and a tube that atttaches to the induced draft assembly onto a barbed port, this barbed port will obstruct with carbon and needs to be cleared annually with a tiny dril bit or similar device.

Jan 24, 2014 | Fedders Heating & Cooling

1 Answer

Bryant Furnace 350MAV code 31


Probably a failure of the draft inducer fan motor, draft inducer blower, or the pressure switch that senses the operation of the draft inducer.

Oct 25, 2013 | Heating & Cooling

2 Answers

I have a Payne furnance, yesterday it stop giving up heat but give out only cold air. The led sensor light blinks 3 times slow pause in between and fast 3 times after. What do I need to fix this furnance...


Hello, it sounds like the pressure switch is not closing on your furnace and remaining open, reasons for this could be a blocked flue pipe, the tubing going from the inducer motor to pressure switch could be blocked, loose, or have condensation in it, or the switch itself is bad. U can check the tubing by taking it off blowing some air through it and making sure no condensation is in the tubing, then reinstall it. If everything checks out good then the pressure switch is bad and must be replaced.

Mar 02, 2011 | Heating & Cooling

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 Heating & Cooling

1 Answer

Induced Draft Blower Not Blowing- 3 Blinks on LED


Your doing well just right. When the call for heat is on the draft motor gets a call from the board to come on. When this happens if no voltage is present at the motor then you ahve abad baord. Replace it.

Nov 28, 2009 | Heating & Cooling

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 | Heating & Cooling

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.

Oct 25, 2008 | Heating & Cooling

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