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Old 12-31-2009, 10:25 AM   #1
dbh
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Ruud Furnace intermittent problem


Ok this is driving me crazy...furnace works fine for a day then stops working all together...reset the power to the furnace and it starts to work again...checked the board and i get one solid green light and a blinking green light when the thermostat is calling for heat but nothing else happens until i reset the power to the unit.

Any ideas? I have replaced all limit switches last year...control board two years ago. The furnace is a 1993 i believe.

Thank you

db

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Old 01-02-2010, 11:39 AM   #2
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Ruud Furnace intermittent problem


Ok 50 ppl viewed this post and not one person has a clue what might cause this problem...hmm think i might be in the wrong place.

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Old 01-02-2010, 12:17 PM   #3
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Ruud Furnace intermittent problem


Read the error code info which may be on the back of one of the doors or in the electrical diagram. Post the model and serial # and pics of the unit with both doors off so we can recognize it.
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Old 01-02-2010, 08:11 PM   #4
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Ruud Furnace intermittent problem


Ok can not find the model number but here are some pictures.
Attached Thumbnails
Ruud Furnace intermittent problem-img00155-20100102-2029.jpg   Ruud Furnace intermittent problem-img00156-20100102-2030.jpg   Ruud Furnace intermittent problem-img00157-20100102-2031.jpg   Ruud Furnace intermittent problem-img00158-20100102-2031.jpg   Ruud Furnace intermittent problem-img00159-20100102-2032.jpg  

Ruud Furnace intermittent problem-img00160-20100102-2034.jpg  
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Old 01-02-2010, 08:25 PM   #5
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Ruud Furnace intermittent problem


i'm not familiar with this make of furnace, but from your pics, i can see where the flame rod attaches to the burner, but can't see it IN the flame. follow the black wire under the burner, and see the rod is in the flame. if it is, take it out with a 1/4 driver and clean it with fine steel wool ( not sandpaper).

Last edited by hvac benny; 01-02-2010 at 08:27 PM. Reason: unclear sentence
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Old 01-02-2010, 08:29 PM   #6
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Ruud Furnace intermittent problem


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Originally Posted by hvac benny View Post
i'm not familiar with this make of furnace, but from your pics, i can see where the flame rod attaches to the burner, but can't see it IN the flame. follow the black wire under the burner, and see the rod is in the flame. if it is, take it out with a 1/4 driver and clean it with fine steel wool ( not sandpaper).
Benny thanks for your reply...I did that last season, does this have to be done every year?
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Old 01-02-2010, 08:36 PM   #7
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Ruud Furnace intermittent problem


Here are some of the flame sensor.
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Ruud Furnace intermittent problem-img00162-20100102-2132.jpg   Ruud Furnace intermittent problem-img00163-20100102-2132.jpg  
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Old 01-02-2010, 08:45 PM   #8
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Ruud Furnace intermittent problem


it looks like it could use a cleaning. not a bad idea to do this before the heating season every year, but just lightly.
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Old 01-02-2010, 08:50 PM   #9
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Ruud Furnace intermittent problem


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it looks like it could use a cleaning. not a bad idea to do this before the heating season every year, but just lightly.
Would this cause the unit to work intermittently like that? The furnace will work fine for sometimes days and then it will get cold in the house and i will notice that it isn't kicking on...but soon as i reset the power to the furnace it works fine again.
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Old 01-02-2010, 08:55 PM   #10
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Ruud Furnace intermittent problem


The board will lock out if flame is not sensed. Clean the front of the burner also, that's half of the flame proving operation.
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Old 01-02-2010, 09:41 PM   #11
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Ruud Furnace intermittent problem


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Originally Posted by dbh View Post
Ok 50 ppl viewed this post and not one person has a clue what might cause this problem...hmm think i might be in the wrong place.
OK. Leave and then come back! You'll realize that there are none better than this one. If you provide the correct and pertinent information, I will bet you that your problem will be resolved. One or more of the experts who frequent this blog will have an answer! (No matter what) Don't Drink and Drive, Ever!!!
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Old 01-02-2010, 09:47 PM   #12
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Ruud Furnace intermittent problem


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Benny thanks for your reply...I did that last season, does this have to be done every year?
Apparently yes! BTW. You have a ton of technical information on the inside wall of the furnace. Why didn't you take a close (readable) picture of those data?!??
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Old 01-02-2010, 09:56 PM   #13
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Ruud Furnace intermittent problem


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Originally Posted by spark plug View Post
OK. Leave and then come back! You'll realize that there are none better than this one. If you provide the correct and pertinent information, I will bet you that your problem will be resolved. One or more of the experts who frequent this blog will have an answer! (No matter what) Don't Drink and Drive, Ever!!!
I thought it was too SP but after 50 views and not one reply i thought that it might just be...I have had nothing but problems with this Ruud furnace since i bought this house 5 years ago...as i said in my first post i have replaced just about every part that you can replace in this furnace and i am still having problems with it...now if cleaning the burners and flame sensor fixes this i will be very surprised and delighted at the same time. I will post my findings after i clean everything tomorrow....and i agree with you Don't Drink and Drive.
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Old 01-02-2010, 10:00 PM   #14
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Ruud Furnace intermittent problem


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Apparently yes! BTW. You have a ton of technical information on the inside wall of the furnace. Why didn't you take a close (readable) picture of those data?!??
I have trouble shot this unit since day one SP and yes you are correct there is a ton of technical information on the inside of this unit and it still does not tell me what is causing this intermittent problem...if i was just a limit switch that opened up or a fuse or loose wire or whatever no problem i wouldn't even be posting this problem.
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Old 01-02-2010, 10:34 PM   #15
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Ruud Furnace intermittent problem


Sometimes the flame sensor will cause the furnace to lock out completely, and other times it's just dirty enough to be an intermittent problem.

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