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Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. First I’ll need some more info so I have a more complete picture of you situation.
What is the brand and model number of your furnace?
I need a model number. It's on the rating tag which is inside the burner compartment.
Lets start by opening the top panel on air handler and checking to see if Janitrol used a small auto type fuse in the control circuit and if so if it is blown.If no fuse check for 240v in to transformer and 24v out.We will go from here.
Look in red wire from transformer for an inline fuse
Follow red wire coming from transformer looking for the fuse
Probably a barrel fuse or small spade fuse
Look on board
I figured it was. It is a 3 amp fuse.You will ne to replace with same.
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I recommend you buy several.There could be a short that caused that one to blow.Finding a short can be difficult. Easiest way to find is by process of elimination.If you can get several fuses, we can try different things until we no longer blow fuse to locate the short.
Most common causes.
1.Replacing thermostat with power on and allowing wires to touch
2.Chewed or shinned control wires
3. Shorted component