Thanks for the info
does it have diagnostic light?
Thanks for the info
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What is the Model number of the furnace?
Beware of advice given by some guy on the Internet.
Did u put a manometer on to see what the differential pressure is? Checking for debris doesn't mean anything
I had a older Lennox unit doing the same thing a couple weeks ago what I found was a weak inducer motor that when the burners light up would cause the pressure switch to open briefly but never did get an error code just kept trying to relight without locking out
I've had a goodman do the exact same thing to me as post #28.
I had one do this to me too. I cleaned everything and left it working and tested x5 and the next day the on-call guy (seasoned tech) found the p/s fluttering.
how did you find out it was a weak inducer? pressure draw?
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You could have a crack in the porcelain around the flame sensor that once heated expands and grounds out
Correct! we have a great little electronics supply house, not far from me that has everything, you could build the space shuttle with all that's in that store. I buy all my solderless terminals and etc. in there, they have bigger bulk packages and cost less than my supply house.
__________________________________________________ _______________________
Experience is a hard teacher because she gives the test first, the lesson afterwards" ~ Vernon Law
"It's what you learn after you know it all that counts." ~ John Wooden
"When the teachers become unteachable we're all in trouble" ~ Mr. Bill
"Remember "Pro" is only a name, it's not always a mindset determined to do everything correctly" ~ Mr. Bill
__________________________________________________ _______________________
Experience is a hard teacher because she gives the test first, the lesson afterwards" ~ Vernon Law
"It's what you learn after you know it all that counts." ~ John Wooden
"When the teachers become unteachable we're all in trouble" ~ Mr. Bill
"Remember "Pro" is only a name, it's not always a mindset determined to do everything correctly" ~ Mr. Bill
__________________________________________________ _______________________
Experience is a hard teacher because she gives the test first, the lesson afterwards" ~ Vernon Law
"It's what you learn after you know it all that counts." ~ John Wooden
"When the teachers become unteachable we're all in trouble" ~ Mr. Bill
"Remember "Pro" is only a name, it's not always a mindset determined to do everything correctly" ~ Mr. Bill
you can check your ground by checking continuity between neutral and ground. Ground and neutral are electrically connected (bonded) inside the breaker box. though i don't know if the unit cares about earth ground or just ground as a reference. carrier support told me that their units need a good earth ground even if ground reference is good. don't ask me why.
Last edited by wdshea; 01-09-2013 at 05:32 PM. Reason: sorry, didn't realize this post was 3 pages...
__________________________________________________ _______________________
Experience is a hard teacher because she gives the test first, the lesson afterwards" ~ Vernon Law
"It's what you learn after you know it all that counts." ~ John Wooden
"When the teachers become unteachable we're all in trouble" ~ Mr. Bill
"Remember "Pro" is only a name, it's not always a mindset determined to do everything correctly" ~ Mr. Bill
The process of ground checking in this situation is to eliminate any high resistance points between the board/module and the burners. The burners are the negative side of the rectification circuit, and the flame sense rod is the positive side. The board or module supplies an AC voltage to the sensor rod, referenced to the burner ground, and then it looks for the DC microamp current, as a result of the flame rectification.
You MUST have a good connection between the burners and the ground connection on the board or module. In rooftop units, you can apply a jumper from the burner array to the module, and if the problem goes away, you know you have a ground connection issue.
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__________________________________________________ _______________________
Experience is a hard teacher because she gives the test first, the lesson afterwards" ~ Vernon Law
"It's what you learn after you know it all that counts." ~ John Wooden
"When the teachers become unteachable we're all in trouble" ~ Mr. Bill
"Remember "Pro" is only a name, it's not always a mindset determined to do everything correctly" ~ Mr. Bill