We have a newer goodman gas furnace around 3 1/2 years old.
Suddenly today there was only cool air coming from the vents and no heat. We thought that it could be the thermostat but after checking the wires inside it was okay.
then we took the front panel out of the furnace and found that there was no flame and motor was not running. Also there was some light flashing.
We called a furnace technician and he is saying that the motor needs to be replaced? Could there be some other problem.
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Re: heating not working
There could be a number of other potential causes.
3-tripped rollout safety switch
4- tripped limit control
Look at the door of the unit for a explaination of the number of flashes of the light. This may get you started in the right direction.
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If I am understanding you correctly, you are just wanting to circulate the air with your gas furnace and heat the air with your wood burning stove. You should be able to set the fan switch to the ON position and leave the heat/cool/off switch in the off position.
Is inducer motor running. If not change it. If it is then remove vacuum line from it and blow through the line on start up. If this works change the pressure switch. If not start jumping the sensors around the burner until you find the bad one
it would sound like the pressure switch is not working you can take off ther tubes and by hand put a small drill bit in the and clean the switch , some times this works , on some you can jump out the switch and try and fool it in too working
need to go to furnace and watch it...if your hearing a hum the enducer draft motor may have failed...it should start first if there is no fault codes...reset unit by unplugging furnace or in some cases turning power switch off...turn thermostat on heat and watch unit ..the small enducer draft motor should start first the a ignitor glows and the should light...goodman units have a control board with a light on control board when it fails should flash a code and on the door or inside on lable should give you what that code is...hope this helps good luck
Gerge, if you go to website www.energycodes.gov
you can do a heat load calc yourself. Basically, you figure out the sizes of walls, total area of glass. total doors to outside, ceiling area and types of building materials used. It is pretty easy and then you will know for sure. The contractor should be suppling you with one but if not use this, it is free!
It must detect a flame a few seconds after the main gas valve opens or it shuts it down. Since you are hearing the burners fire up the ignitor is working and all the other safety circuits are working to allow the furnace to fire up.
The thermocouple is a small silver tube that protrudes into the flame of the main burners, remove it and scrub with scotchbrite pad or anything mildly abrasive. You just want to remove carbon and corrosion build up, re-install and see if it fires up.
I have two Goodman furnaces and if you are to maintain them your self you should keep on hand a thermocouple and a new ceramic ignitor. They will inevitably fail on the coldest weekend of the year and the only place to get them will be from a service company with a emergency service call ...$180.00 VS $60.00 off ebay or internet sales.
Also if your power vent fan is making ANY noise it is on its last legs and buying on in advance online will save you about $80.00 over the loca ldealers price......been there done that
If there is no blinking light, then the unit is not seeing a call for heat or cool. My guess is a lose or broken wire in the thermostat circuit. Try and putting a jumper across the red and white heat terminals inside the furnace and manually closing the door switch. If you get heat, it's telling you there is a wiring issue. If you get nothing, it's a bad circuit board.
Same problem with 1 yr old Goodman. Checked entire exhaust and pressure switch. Inside fan, pressure switch hose clogged with crusty white gunk. Cleaned it & furnace fixed. I have no furnace repair experience, but love to "play MacGyver". Hopefully this could save someone a service call.