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I will be glad to assist you.First give me model on old and tell me what wires went where on old
Did yo take a pic before removing or write down what wires were connected where?
Oh you are also going to need a C wire for the Honeywell to work.Is there an extra wire in bundle that you can use?
OK so let me make sure I understand.
Coming out of wall you have 5 wires. (Red,white,Green yellow and blue)
Red to R with a jumper to RC
Green to G
White to W
Yellow to Y and
Blue was unused.
Red to R with jumper to RC
Yellow to Y
White to W-O/B
Blue to C Is this correct?
OK if you did not turn power off before removing wires, they probably touched each other and blew a little fuse in air handler.What is model on indoor air handler and I will tell you where to look.
Is it a gas furnace ?
Remove both panels. Look in blower compartment and locate control board.Remove fuse and see if it is blown.
Do you have a multi meter for checking voltage?
Also do one more thing. Since blue was not connected at thermostat lets make sure it is connected to C on furnace board.If not we have to connect it
Can you follow it and see if maybe it is connected to the blue somewhere,maybe at a float switch or something
Connect it to C along with the wire that is already there
Got door back on furnace?
Go to thermostat loosen R and G wires and touch wires together and tell me if blower comes on.