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Trane xv90 Replaced inducer and control board with kit

Customer Question
#16582 on Dec 31st 2015...
Trane xv90 Replaced inducer and control board with kit #16582 on Dec 31st 2015. Unit stopped running on 1-20-16. Inducer blower would not switch on. Internal error code. Just replaced with another board and inducer. Inducer starts, ramps up and then shuts down before the igniter engages. Error code 3 flashes. Bypassed pressure switches with same results
Submitted: 2 years ago.Category: HVAC
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Customer reply replied 2 years ago
I have cleaned all the tubes and fittings as well
Answered in 15 minutes by:
1/26/2016
HVAC Technician: heatncoolrepair, HVAC Technician replied 2 years ago
heatncoolrepair
heatncoolrepair, HVAC Technician
Category: HVAC
Satisfied Customers: 75
Experience: 13 Years of Residential Furnace & A/C Repair Experience.
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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.

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Customer reply replied 2 years ago
Draft pressure error.
a. Venting problem
b. Pressure switch problem
c. Inducer problem.Venting is good
HVAC Technician: heatncoolrepair, HVAC Technician replied 2 years ago

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.

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Customer reply replied 2 years ago
There is no water as the unit has not had time to run. The drain is clear.
HVAC Technician: heatncoolrepair, HVAC Technician replied 2 years ago

Also make sure to clean out the trap and drain hoses really good too.

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Customer reply replied 2 years ago
Trap and hoses are clear
Customer reply replied 2 years ago
Resistance across both switches is 1 ohm or less
HVAC Technician: heatncoolrepair, HVAC Technician replied 2 years ago

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?

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HVAC Technician: heatncoolrepair, HVAC Technician replied 2 years ago

Also, is the inducer sealed up in the back or have a gasket?

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HVAC Technician: heatncoolrepair, HVAC Technician replied 2 years ago

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.

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Customer reply replied 2 years ago
I do not have a manometer.. I have blown into the tube and heard the switches close while the inducer is ramping up, but it still shuts down before the igniter starts
Customer reply replied 2 years ago
I have run it with the burner cover off
HVAC Technician: heatncoolrepair, HVAC Technician replied 2 years ago

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?

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Customer reply replied 2 years ago
Sealed inducer with RTV as suggested in install manual
Customer reply replied 2 years ago
Is roll out No or NC. High limit is new
HVAC Technician: heatncoolrepair, HVAC Technician replied 2 years ago

sounds like you have done everything correct. roll out should be NC

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Customer reply replied 2 years ago
I will re-check and get back to you. Have to run out to a Boy Scout meeting. I will get back to you ASAP. Thanks.
HVAC Technician: heatncoolrepair, HVAC Technician replied 2 years ago

2" or 3" venting?

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HVAC Technician: heatncoolrepair, HVAC Technician replied 2 years ago

ok, how long before you return?

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HVAC Technician: heatncoolrepair, HVAC Technician replied 2 years ago

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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HVAC Technician: heatncoolrepair, HVAC Technician replied 2 years ago

I have to go. If you are happy with my service tonight, please don't forget to rate me. Have a good night.

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