Thermostat and furnace problem


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Old 05-20-18, 07:41 AM
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Thermostat and furnace problem

so yesterday we had a schedule power interruption and when the power came back on my thermostat started to smell like burnt plastic, i turn off the breaker and replace the thermostat but now nothing works looks like i have no power to the furnace could it have blown something in the furnace? I have a trane xe90 model number tux080c942b4. Kinda need help its cold here in Canada.
 
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Old 05-20-18, 07:47 AM
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Yes, Trane has been installing fuses in their furnaces since the late 90's.
 
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Old 05-20-18, 08:37 AM
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Ya the 5 amp fuse is ok in there
 
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Old 05-20-18, 08:39 AM
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Trane’s B is C on every other brand. How did you wire up the new stat?
 
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Old 05-20-18, 08:52 AM
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Old 05-20-18, 08:55 AM
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W to w y to y g to g r to rc/rh but dont have c wire on my thermostat what do i do with it
 
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Old 05-20-18, 09:11 AM
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Does the thermostat have a display?
Did you recheck the battery orientation?
 
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Old 05-20-18, 10:05 AM
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Couldn't get anything from your picture link. How-to-insert-pictures
 
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Old 05-20-18, 07:22 PM
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Yes thermostat have a display batt are new
 
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Old 05-20-18, 07:32 PM
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You are going to need a voltmeter to make voltage tests.
You need to check from R to C at the bottom of the control board for 24VAC.

Remember..... when you are working with a furnace..... if the blower door is open.... the power is cut to the unit. You need the blower door on or hold the safety switch in.

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Old 05-21-18, 07:46 AM
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Got nothing on the volt meter r with c when im closing the door Switch
 
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Old 05-21-18, 05:59 PM
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Next step is to check the 120v > 24vac transformer for 24v.
 
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Old 05-22-18, 05:24 AM
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Where would that be located
 
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Old 05-22-18, 08:05 AM
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It's connected directly to the control board. I don't know its exact location.
You can post a few pics of the area and we can help you visually.
How-to-insert-pictures
 
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Old 05-22-18, 04:28 PM
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I think the transformer is in the board
 
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Old 05-22-18, 04:42 PM
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No.... the transformer is separate. It may be that item with the red arrow.
The pink arrow is the fuse that should be in one of the transformer secondary lines.

See if you can shoot a larger pic so I can see more detail.

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Old 05-23-18, 04:46 PM
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I have a round thing witch is a capacitor and the other pic not to sure would it be the transformer
 
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Old 05-23-18, 05:50 PM
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This is the transformer...............

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Old 05-23-18, 07:15 PM
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So i test them the way you show me?
 
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Old 05-23-18, 07:28 PM
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Test for 24vac first. If not there..... check the 120vac.
 
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Old 05-23-18, 07:35 PM
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Only have 114vac and no 24vac
 
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Old 05-23-18, 07:41 PM
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Ok..... the transformer is burned/open. It needs to be replaced.

You need a 120vac ---> 24vac @ 40va.
Here's one I snagged off amazon. They're widely available.
Goodman-0130M00140S-Transformer-120V-40VA

The mounting can be different. Try to find one with the slide-on terminals.
 
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Old 05-23-18, 07:45 PM
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That sound way better then a burnt control board will get replacement tomorrow and if this work im shipping you a case of beer buddy!!! Thank you so much for you help man!!!
 
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Old 05-23-18, 07:52 PM
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I believe your board used the plastic fuses. Get some smaller ones. 4A would be good. I even like 3A. In my opinion.... the 5A are a little too large.
 
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Old 05-23-18, 07:54 PM
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Will do buddy! Rather change fuse then boards and transformer
 
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Old 05-24-18, 09:16 AM
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So i just plug the new one and put power on or theres a special way to do this?
 
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Old 05-24-18, 09:50 AM
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It is probably damaged on the high voltage side.
 
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Old 05-24-18, 01:00 PM
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Turn the power off and just swap over the four wires.
Make sure to match the connections listed on both transformers.
 
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Old 05-24-18, 04:43 PM
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Got new transformer everything works but as soon as i put the fan on i hear son arking a the fan motor
 
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Old 05-24-18, 04:49 PM
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You can correct your reply yet.
 
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Old 05-24-18, 05:11 PM
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When i turn the fan on i hear some arcing (sparks) at the fan motor
 
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Old 05-24-18, 05:15 PM
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Ok. Not much I can do for you on that. If the motor is arcing internally then it's bad too.

It's pretty rare for a motor to arc. There are no brushes in there.
Usually an arc would cause a breaker to trip.
 
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Old 05-24-18, 05:18 PM
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Ohh that’s awesome............
 
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Old 05-24-18, 05:27 PM
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Is there a test a could do to test the motor or wiring?
 
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Old 05-24-18, 05:42 PM
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Open the blower door, hold the safety switch in and look for visible sparks.
Possibly there is something caught in the blower wheel. You can turn the power off and spin the blower wheel by hand to see if there is any noise then.
 
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Old 05-24-18, 05:53 PM
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No noise and nothing caught in the fan
 
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Old 05-24-18, 05:55 PM
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If it were me servicing that unit for you.... I'd pull out the blower/motor assembly to look at it out of the furnace. There are usually three screws along the top of the blower that you remove and the entire blower assy will slide out. You may have to let the control board down if it's in the way.
 
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Old 05-24-18, 06:06 PM
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Correction, i have a electronic air cleaner the sparks are coming from there and when i turn it off nothing sparks
 
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Old 05-24-18, 06:31 PM
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I dont know if you can read this picture but on the side of the air cleaner it says, occasional arcing is normal feature of an electronic air cleaner!!! So this is nornal just never noticed it before, now everything seem to work well i would like to thank you you really help me and save me some money i really appreciate it!! Thanks again Pete!!!
 
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Old 05-24-18, 09:25 PM
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Yes... an electronic air cleaner has sporadic arcing. I have one myself. Those metal cells should be taken out of the furnace and cleaned at least once a month. I clean mine in the dishwasher.

The arcing you are hearing is caused by large pieces of dust and lint getting caught on the grid. There should be a screen or pre-filter before the electronic grid to help remove the big bits.
 
 

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