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Is this a Carrier, Bryant or Payne unit?
Is it still locked on 33 code?
in the upper section is a flat plate the size of a credit card..it is mounted flat against the front wall.
It has 2 wires attached..
Locate that flat plate and tell me when you have found it.
AND is the blower running and filter clean?
turn power off to furnace...tap the plate as described 3-4 times. Med taps...like rapping on a door lightly.
Turn power back on and tell me code
thank you..so now the exhaust fan starts...
Do you see a glow or get 3 seconds of flame?
When did furnace last run?
What is model number of the unit?
so we went from a code 33 and no ignition...
Tapped on plate...
Now we light but flame goes out in 3 seconds with a 34 code?
how long is the furnace running with flame before it stops and reverts to 33?
at one end of the burner is the glow ignitor.
At the other end is a flame sense rod. It is a metal rod with a white ceramic base and one wire.
Locate this rod and clean it with steel wool.
Tell me if flame stays on