C wire on new WiFi Honeywell T-stat


  #1  
Old 07-26-14, 12:45 AM
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Question C wire on new WiFi Honeywell T-stat

So, like so many others I've seen, I bought a new tstat and I don't have the C wire.

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However, I found this wonderful video from Honeywell stating that I can just use the G wire, lose control of my independent fan controls, but still get by. Great! So I plant the G wire into the C terminal and head down stairs to do the same thing on the terminal block. However, there's already a red wire terminated to the C terminal.

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The Red wire in C is bundled with a yellow wire and going to the back of this thing, which is mounted to my Furnace.

For what it's worth, here's a diagram of the terminal block
 
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Old 07-26-14, 01:15 AM
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That video does not have a 2 transformer system.

Post some pics of the condenser wiring outside.
 
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Old 07-26-14, 06:47 AM
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Thanks for responding





 
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Old 07-26-14, 07:31 AM
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I see high voltage wiring in your pics. Can you take some pics from further back at the indoor and outdoor unit?

Does that Rc wire run to a transformer at your outdoor unit?
Are you using more than 2 low voltage wires from the house to the outdoor unit?

We need to find out more information on your RH and RC wires.

Your contactor outside looks bad.
 
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Old 07-26-14, 08:42 AM
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There are wire colors that appear at the thermostat but not at the fan center. The thermostat wiring may be spliced or doesn't go to where you are showing us.
 
 

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