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What is the brand and model number of your furnace?
Ok, what do you have a an LED blink sequence on the control board?
You have to go to the furnace and look through the peep hole in the blower compartment panel and tell me how many times does the LED blink before it pauses and repeats
There is no power to the unit if you remove the blower panel. You have to put it back so the blower panel switch is pushed in held in by the panel being properly in place
So what happens? still have a blank thermostat?
I'm not available for a call and there is an additional charge for a call
We can continue here if you like.
What is the LED doing?
Is it on solid? blinking?
Is the thermostat calling for heat?
Have you checked since you put the panel back? Is anything running? the small draft fan on the front?
Ok, I don't have the time to finish this. I have to leave shortly. I'm going to open this up to my colleagues so one of them can help. Please don't respond (even to acknowledge this post)until you get a response from us. If you respond first it will only delay your answer.