Question about Heating & Cooling

1 Answer

Fan on furnace not spinning

The fan on the furnace is not spinning, when the furnace comes on it hums. The pilot lights and flames come up but it's not heating the house like it should.

Posted by on

  • jddavney Nov 25, 2008

    Thank You for the advice, we finally found the motor and all is well.

×

Ad

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Novelist:

    An expert who has written 50 answers of more than 400 characters.

    Governor:

    An expert whose answer got voted for 20 times.

  • Expert
  • 124 Answers

Check the fan capacitor first. its a little silver flat battery looking thing near the motor. be sure to kill power. test mf value stamped on the side with a meter, or take to a motor shop and test. if its good the motor is bad. . pull whole blower assembly and change the motor or take to motor shop and let them change. label all wires and where they go and the color. it will be tough if you don't know motors and all but generally white is to white and is common or neutral. black is high speed for ac . red is low speed for heat. brown and brown with stripe go to capacitor. blue and yellow are med and med hi speeds and taped off or put on vacant terminals. be sure to clean wheel when you have it out. good luck. you can't make to many notes , mark stuff with a sharpie pen as you dissassemble. note rotation of wheel, location of screws, clearances of wheel on each side check rotation of wheel on completion, cups into the wind. <------ )

Posted on Nov 21, 2008

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

My furnace is a Rheem has issues of pilot light not staying lite the flame blows out won't stay on long enough to heat house


First thing I do, especially if the furnace is an older one, is to light a match or long end lighter(like for BBQ pits), hold it inside the opening on the front of the furnace heat exchanger, where you would normally see the burner flames, then turn on the fan only. If you see the "flame dance/flame disturbance", then that furnace may be unsafe due to a cracked heat exchanger. Holes or cracks in heat exchanger will blow out the pilot by allowing the air that we breathe to enter the heat exchanger and mix with the combustion process. AND may cause carbon monoxide poisoning. In that scenario, I would call in a professional. Now if it's not a heat exchanger issue, the flue pipe may have a back draft issue. Again, call a professional! Play it safe with that issue. Hope this helps!

Mar 14, 2017 | Heating & Cooling

Tip

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

2 Answers

The heater turns on, but does not ignite. The fan runs for about 5-7 seconds then shuts off. I am assuming the heater needs a good cleaning?


pilot lit on gas furnace, but the burners won't light (Home ...

answers.angieslist.com > Home > HVAC
Oct 26, 2013 - i have a gas furnace with a lit pilot, but the burners won't light. ... I hv gas furnace we turn thermosate on upstairs but still wont turn on coud turn ...

Furnace Not Starting - Clean the Flame Sensor - YouTube

? 3:15
https://www.youtube.com/watch?v=Ecd5CzJjss4
Jan 4, 2012 - Uploaded by Home Improvement Videos
If you woke up to find that your gas furnace is not starting or it's ... If this sensor gets dirty (and they almost always do over time) then your furnace will try to light, ... working, you can hear it starting, but the burners on not coming on. ... The furnace nowcomes on every time and the house is nice and cozy.

Furnace wont start. What to do before calling the repair man ...

? 10:11
https://www.youtube.com/watch?v=yJxDc90hs4g
Sep 12, 2012 - Uploaded by grayfurnaceman
Our property manager is great about sending a repairman, but the house is a mess. ... While troubleshooting my downstairs furnacethat wouldn't turn on, I turned off the ... Not sure what to do now about flame rollout switch..

Jan 05, 2016 | Heating & Cooling

1 Answer

How do you adjust the pilot light flow on an old magic chef heating unit/ceiling mounted furnace?


How long is the pilot flame? It could be you can move the thermocouple into the flame by making adjustments of the metal holder. If the flame is small, there is an adjustment for the piolet flow in the control module where you turn gas on and off and light the pilot. It should be labeled and usually has a cover that must be unscrewed to reveal the adjusting screw. Need a bright flash light to see what you're doing.

Feb 28, 2015 | Heating & Cooling

1 Answer

Dayton gas furnace model 3e385 works and lights but as soon as fan comes on the unit shuts off and lights again wondering what was wrong


Check heat exchanger for cracks or holes which will cause the fan to blow out the flames. The flame sensor on the pilot or burners has to be in constant contact with flame to operate normally. If the flame is put out by a cracked exchanger the exchanger or furnace needs to be replaced.

Nov 22, 2011 | Dayton Gas Furnace Heater

1 Answer

The furnace will light up and the fan will blow but the flames cut out before my house reaches temp. i have the thermostat set at 70 and the house will not get above 55. i have tried turning the propane...


First, for those of you who might not know, "What is a flame sensor?" A flame sensor is a safety device. When your furnace's main burners ignite (light Up) the flame sensor picks up the heat from the furnace's main burning and says, "YES," and sends a signal back to the main furnace control board saying that it is OK to let the main burner stay on. Or if the main burners do not ignite, the flame sensor does not pick up the heat and says, "NO" to the main control board, Shut That Gas Valve and Main Burners Down! Thank God we have safety controls like the flame sensor. Most of the time, after turning your furnace's power off, you may clean the flame sensors with light sand cloth, emery cloth or steel wool. Reinstall the flame sensor and you are back in business! Over the years flame sensors can build up a light coating of burned-in dust and dirt. This insulates the flame sensor so that it doesn't sense the heat of the flame well enough, so by cleaning it you have almost restored it to its new condition. Seldom, but sometimes they do go out completely.

Dec 08, 2010 | Coleman Heating & Cooling

1 Answer

We switched from ac to heat yerterday, but the furness (RUUD 90 Plus) is not coming on. It sounds like it is about to come on, but is just making a low humming sound like it is getting ready to come on. ...


On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

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).

Oct 05, 2010 | Heating & Cooling

1 Answer

I have an intertherm gas furnace and it will turn on but it takse almost an hour from the time i turn the heat up until it kicks on. I can hear the click and it sounds like the motor is humming. I have...


On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

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).

Jan 23, 2010 | Heating & Cooling

1 Answer

Furnace pilot is on, pilot ignitor continues to click, no main flame


sounds like the sensing bar on the spark ignition is dirty.....a wire brush works nicely.

Oct 17, 2008 | Carrier XHB123D X/Y Series Heat/Cool Air...

Not finding what you are looking for?
Heating & Cooling Logo

Related Topics:

134 people viewed this question

Ask a Question

Usually answered in minutes!

Top Heating & Cooling Experts

Paul Carew

Level 3 Expert

3328 Answers

Tim Whalen

Level 3 Expert

3074 Answers

Marvin
Marvin

Level 3 Expert

81294 Answers

Are you a Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...