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Hi there, can you tell me what error code 3 means? I believe this is the trane upgrade kit with a new AC inducer and control board? I've replaced a half dozen or so of these.
I don't believe you can just bypass the pressure switches on this furnace and fake the circuit board out. If you are getting a pressure switch fault code, as I have too before on these, I would make sure the inducer is draining. Pull the little 90 degree hose adapter off the bottom of the inducer and see if water drains out. If it does, then the adapter is plugged and needs to be cleaned out with a little pipe brush. That little 90 degree adapter always plugs up.
Also make sure to clean out the trap and drain hoses really good too.
if everything is clear, then it is a matter of checking to see if you are getting enough pressure to close the pressure switches. Do you have a manometer and are you familiar with checking pressures?
Also, is the inducer sealed up in the back or have a gasket?
Other things you can try are to run it with the exhaust pipe disconnected or the cover off the burner compartment to see if that closes the pressure switches and fires up.
and it still does not kick on with the burner cover off? Also, have you checked the roll out switches on the burner or the hi-limit?
sounds like you have done everything correct. roll out should be NC
2" or 3" venting?
ok, how long before you return?
If you have a reverse flow switch on this furnace, like on figure 22 of the instructions, check to make sure that is also NC. If all these things check out, I would also check to make sure all the pressure switch hoses are tight on the fittings. If not, snip the ends off each of the hoses and reattach them. Also, blow through them to make sure they are not plugged. If that all checks out, then you need to check what kind of pressure you are getting with a manometer. If the pressures are good, replace the pressure switches, if they are bad, then check your furnace installation manual to make sure your venting is the correct size and length, and make sure there are no obstructions in the piping.
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