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gman5256 10-27-2012 07:53 PM

Bryant 383kav
 
Why does my heater work for a while then stop. The motor cycles back on then the burners won't light and it blows cold air

ben's plumbing 10-27-2012 08:12 PM

Quote:

Originally Posted by gman5256 (Post 1039237)
Why does my heater work for a while then stop. The motor cycles back on then the burners won't light and it blows cold air

what error code or the number of flashes on control are you getting ben sr

carmon 10-27-2012 08:19 PM

Quote:

Originally Posted by gman5256 (Post 1039237)
Why does my heater work for a while then stop. The motor cycles back on then the burners won't light and it blows cold air

way more info please...that's like saying why do my feet hurt...:whistling2:

gman5256 10-28-2012 06:24 PM

Learning as I go here...error code is 34. I polished the sensor with steel wool and restarted. It ran fine until it cycled off and then came back on blowing only cold air. I shut it off, emptied the drain box, blew out the copper line til it was empty. Now it just tries 3 times to start and goes into lockout.

Houston204 10-28-2012 06:29 PM

Do you still get the code 34 error?
Do you still get flame ignition before lockout?

gman5256 10-28-2012 06:32 PM

Quote:

Originally Posted by Houston204 (Post 1039861)
Do you still get the code 34 error?
Do you still get flame ignition before lockout?

Yes, it ignites 3 time and then locks out. Still have 34 error code.

Houston204 10-28-2012 06:43 PM

Verify that ground is connected to the furnace.
Clean the face of the burners that is exposed to flame with a small wire brush. Be careful not to touch the fragile hot surface ignitor.

Your furnace is looking for at least 1/2 of one millionth of an amp DC from that flame sensor. I usually measure 2.8 to 5 uA DC when cleaned.

gman5256 10-28-2012 08:21 PM

Thanks, Houston. I was looking at it today and I think I can pull the burners and clean them. The electrical testing is probably beyond my abilities, but I have a friend who is a Master Electrician. I'll take a closer look at the igniter while I'm at it. The sensor looks ok to me, but it is a little different color at the tip.

Houston204 10-28-2012 11:26 PM

I scrub them in place. I remove the sensor to clean it. Verify that the porcelain base of the flame sensor isn't cracked.

Wiring a meter in series with the flame sensor is not difficult with the right meter.

gman5256 10-29-2012 05:54 AM

I did pull the sensor to clean it. I used steel wool...would sandpaper be better?
I took the sensor with me to a supply store(they didn't have one in stock) and the "guy" said the sensor looked good...the base is shiny white and undamaged.

Houston204 10-29-2012 07:16 AM

That flame sensor is only half of the circuit.

The circuit board sends voltage to the flame sensor and measures the amperage. The flame conducts the voltage to the furnace body (ground).
If the ground wire isn't making good clean contact with the burners through the small greenwire connected to the burners it can reduce the 3 millionths of one amp to less than .5 micro amps dc.

If I had a vacation day for every time that ground wasn't properly connected to a furnace, I'd be asleep now:wink:.

gman5256 10-29-2012 11:59 AM

I pulled the ground and cleaned the contact and the surface where it attaches...there was no apparent corrosion. The igniter glows before the burners kick on. My electrician friend is going to measure the voltage at the sensor for me. I've heard that the sensor can be bad even though it looks ok.

Houston204 10-29-2012 01:40 PM

That sensor isn't much more than a bent nail with a porcelain base to insulate it from ground.

Does the field installed ground wire screw to the furnace body or wire nut to a green wire that runs to the burners?

If it screws to a 2 by 4 jbox in the furnace, verify that your jbox is making a clean contact with the furnace body.

Houston204 10-29-2012 08:00 PM

This example has the ground connected to a junction box.
http://i151.photobucket.com/albums/s...naceground.jpg


This would be a good reading...
http://i151.photobucket.com/albums/s...tification.jpg

gman5256 10-30-2012 12:14 PM

[QUOTE=Houston204;1040623]This example has the ground connected to a junction box.
http://i151.photobucket.com/albums/s...naceground.jpg


This would be a good reading...
http://i151.photobucket.com/albums/s...tification.jpg[/QUOT
good pics and info


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