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So you have 12VAC at unit, but not to the terminals that the low voltage wires that feed the controller?
Okay I've seen this several times where the controller goes bad, but if the two screws where the low voltage wires go doesn't have 12 volts then its the computer board or the low voltage transformer.
Do you have a multimeter?
If you have a multimeter we can test the transformer.
Give me a second to pull up a diagram
Is your a 2432? 2430?
Here it is. Attached to the back of the unit on the right side
I assume you have already done this.
I see the first pic did not go through. Resent here
You have to remove the fan to see the transformer, but not to test it. Its behind the fan, but you should be able to reach back there and find the wires
Yes. Its what I do all the time as a certified and factory trained rep. Some times its fun but not always.
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Do you have any further questions?
How's it going?