DIY Home Improvement, Remodeling & Repair Forum > Appliances > HVAC > Carrier furnace fan won't switch on




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Old 04-08-2010, 05:29 PM  
Augment
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On the tstat, there's nothing on R2. On the furnace, nothing on W2.



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Old 04-08-2010, 05:33 PM  
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OK, one last question, is there a humidifier installed on this furnace?
I'm looking for a "C" terminal on the furnace and/or tstat.
Wifey is calling be back shortly (30mins) or so.



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Old 04-08-2010, 05:36 PM  
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Yes there is, and the thin black and white wires from these seem to go into this panel too. the humidistat is on the furnace and is separate from the thermostat.

By the way, the green wire going to G on the furnace is labelled "rehum".

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Old 04-08-2010, 06:13 PM  
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Any chance I can get a pic of the back of the tstat showing terminals and wires and likewise for the furnace compartment?

When did this problem start?

What has changed since it last worked?

This wiring doesn't make any sense and definitely does not follow conventions.
I just can't wrap my mind around this one.

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Old 04-08-2010, 06:51 PM  
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here are some photo's. Thanks again.

thermostat.jpg   furnace.jpg  
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Old 04-08-2010, 06:51 PM  
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Post a legible schematic for the t'stat/furnace-input interface; this can be used for a 'brute force' way of figuring out what is going on. This probably shows less than a half dozen wires, and it's the manuf. recommended configuration. Your t'stat manual will show how it's internal switching is matched to its terminal designations.

The colors actually used for each function in your particular case can be sorted out afterwards.

A VOM will soon be necessary. . .

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Old 04-08-2010, 06:55 PM  
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As you can see from the photo's the schematic would be very complicated, not something I can tackle if I don't know what I'm supposed to label. What is VOM??

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Old 04-08-2010, 06:58 PM  
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Quote:
Originally Posted by Augment View Post
the schematic would be very complicated
What is VOM??
The complexity is what this forum handles, once we have the schematics, which you will find online or pasted on the inside of furnace panels.

It's a Volt-Ohm-Milliammeter.
http://static.howstuffworks.com/gif/home-repair-tools-ga-5.jpg
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Old 04-08-2010, 07:30 PM  
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here are some photo's of the schematic. Hope they're legible.

schematic.jpg   connection-diagram.jpg  
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Old 04-08-2010, 07:30 PM  
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I don't see where the yellow and green wires come into the furnace from the tstat.
It's almost like they splice the wire somewhere and the wire colors changed between the tstat and the furnace.
On the tstat I see white, yellow, green, red, and blue (with the blue not being used).
On the furnace I see white, black, red and blue.
A volt/ohm meter sure would be nice to have right now but, i think I know what's going on and can advise once you confirm what happened to the yellow & green wires.



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