what does sensor look like - http://www.hvacmechanic.com/ Forums
Original message
| ready4help
 |  "what does sensor look like"
, posted Tue 22 Feb 08:49:  
please would someone help me.My furnace is blowing for one minute then the burners shut off and the blowers are going,this keeps repeating itself and my house is not getting any warmer. I have a Bryant model#383kav. I have tried cleaning it and I am at a lost because I dont know what the status code means but its flashing 12 blower on after power up
thanks kevin
[this message was edited by ready4help on Tue 22 Feb 10:21] |
| Replies:
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| tbighunter
| "Re(1):what does sensor look like" , posted Tue 22 Feb 13:05
ON YOUR FURNACE THE BLOWER WILL POWER UP FOR I BELIEVE 90 SECONDS ANYTIME POWER IS INTERRUPTED WHILE THE TSTAT IS CALLING FOR HEAT.YOU NEED TO WAIT 90 SECONDS AND THEN IT SHOULD TRY TO START UP THE HEAT.OR YOU CAN TURN THE TSTAT OFF,RESTORE POWER AND THEN TURN YOUR STAT TO HEAT.
HVAC SERVICE MANAGER
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| tinner73
| "Re(1):what does sensor look like" , posted Tue 22 Feb 09:44
what sensor?
union trained in Chicago
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| | ready4help
| "Re(2):what does sensor look like" , posted Tue 22 Feb 10:25
I had a problem last year,my furnace would not stay on and the repairman said the sensor was dirty I think, but now my furnace is only running with burners on for a minute then with blowers for 2 or 3 min. and then the blowers will fire up again.
thanks kevin
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| | Apprentice
| "Re(3):what does sensor look like" , posted Wed 23 Feb 17:12
Time for that annual monthly filter change, ie, its limiting off which drops out the burners and the fan continues to run which cools it off again and lets it refire until it limits off again.
If the filter was clean then something is restricting the air flow. Furniture rearranged blocking return ait grill maybe?
If you changed the dirty filter and its still doing it, realize that the limit switches are fargile and not made to cycle a bunch of times so its weak and needs replaced.
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