Trane XR90 leaking water behind inducer

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Old 01-01-16, 12:04 PM
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Trane XR90 leaking water behind inducer

Problem statement:
Furnace would call for heat and appear normal but cycling would follow with an error code of 3 LED flashing lights on the control board.

This message is not a request for answers as I found the root cause following one technician call which did absolutely nothing and then great phone support on New Years Eve day from a Trane technical support person. This included a night without heat as well.

Root cause:
Per Trane bulletin shown below

Cold Header Transition Receptacle
RCT00084 and RCT00851
Models: All 90% Furnaces:
AUX, TUX, CUX, AUC, TUC, AUY, TUY, ADC, TDC, ADX, TDX,
ADY, TDY, CDX
Serial Numbers: Prior to 6151*****
ORDER No: FURN-SVB22A-EN DATE: October 20th, 2006

http://www.desertmountaintrane.com/t...%2010-2006.pdf

A $12 plastic part (receptacle) of a known issue which is behind the inducer. The screw holes are part of the vacuum chamber prior the inducer and was cracked over time thereby resulting in the pressure switch error. I temporarily gorilla glued the plastic piece that broke off and RTVd with high temp gasket maker from Lowes while I wait for my $12 part to be shipped next week. The temporary fix worked like a charm. No cycling, normal call for heat. Family and I are very happy.

I went through all of the normal troubleshooting:
1. Cleared all water lines
2. Cleared the water trap
3. Verified exhaust not clogged
4. Checked pressure switch itself (ohm out normally open and closed)
5. Verified electronics on pressure switch (good)
6. Verified hoses were not damaged

Bottom line is that vacuum was being lost prior to inducer which is part of the heat exchanger pressure verification. Also, some rust had developed under the screw hole on the plastic receptacle showing water had been leaking.

I then found on this forum and HVAC forum the exact same post and solution. I thought I would share with the forum so some poor soul does not go on the tangent that I went down.

See this link as this also shows pictures:

Trane xr90 leaking water from behind inducer
 
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  #2  
Old 01-02-16, 03:01 PM
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<<I went through all of the normal troubleshooting:
1. Cleared all water lines
2. Cleared the water trap
3. Verified exhaust not clogged
4. Checked pressure switch itself (ohm out normally open and closed)
5. Verified electronics on pressure switch (good)
6. Verified hoses were not damaged>>



Unfortunately, a pressure switch can remain open for a wide range of possible problems. The person making repairs has to look for the possible causes of the problem and eliminate any that aren't the problem. Eventually, you should be left with the one or ones that are in fact the problem.

Congratulations on your success!
 
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