Trane XE1200 air handler blower not coming on


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Old 08-16-14, 01:33 PM
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Trane XE1200 air handler blower not coming on

Hey whats up guys,

Im having issues at home.

It all started 2 weeks ago when the house got warm and I went to the inside unit and noticed that the low pressure line going into the unit was frosted and I could not hear the blower.

It was the middle of the night so I just shut the breaker off and let it melt. In the morning I checked it and verified the blower was not coming on. I did go outside and the outside unit was working.

I research a bit online about the issue and found somewhere that it said to cehck for 24vac at R & G and I did and it said to jump the two to see if the motor came on and I did and it started fine. Well after this the blower started to work with no issues for about 4 days.

After 4 days I noticed that the blower fan was coming on for a few seconds and then turning off for a few seconds and then coming back on and it kept doing. This happened again during the night so I left it for the morning. When I got up I went and checked the outside unit and the fan was not running and did noticed that the fan spun freely but not nice and smooth. I checked the capacitors and the start capacitor was bad so I went and grabbed a new one and installed it but the fan did not start until I helped it with a stick. After it started I went upstairs and the air handler blower was still turning on and off and on and off but it was throwing out cool air. The next day I went outside and the fan was not on again and it would not start even if I helped, troubleshot it to a bad motor and ordered one online and got it in yesterday.
I installed it this morning and had my wife turn on the breaker inside the house while I was outside and the outside fan works like a charm. The issue is that when i went upstairs I went to the air handler and the blower is not working now. I tried jumping R & G again but now its not doing anything. I checked the control board and its good and and check for voltage in the 5 pin plug that goes into the ECM and there is voltage there.

Any ideas what this could be?
 
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Old 08-16-14, 02:18 PM
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You've got me totally confused. You said the blower was not working properly so you changed capacitors. Then you went outside and changed the condenser fan motor ?

These are two separate fans. It sounds like your blower motor in your air handler is the one that needed replacement. If the blower motor is the ECM type then you'll most likely need to remove the end bell and look for burned components.
 
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Old 08-16-14, 05:35 PM
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OK, so today I replaced the condenser fan motor and cap and when i turned the system on the handler (inside unit) blower is not coming on. I looked inside the ECM for the burned thermistor and its clean in there.
 
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Old 08-19-14, 06:24 AM
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When looks like the blower is no longer coming on. I got a zebra vz7 tester and eliminated the thermostat and the control board and motor. The only thing is that I have a ecm 2.5 and I a video that said the zebra variable universal tester doesn't work with the 2.5. I was ready to order an ecm but after reading that now I don't know what do to.

Any ideas?
 
 

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