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Is this a gas furnace or heat pump/electric. Russ
If you can get furnace open blower door and check the 5 amp fuse on the furnace board. It will be a yellow 5 amp auto type or a purple 3 amp. Chck that first. Russ
The furnace board will be behind pant tha covers the blower, Should be located bhind door mounted to fan houses.
Need to check fuse on board
Sorry cut off at 10 CDT. If he changed thermostat he may blown fuse or transformer. Does not take much to blow transformer only a short touch of wires. In the middle of picture you have a red and blue wire coming off transformer. Check the red wire and see if you have an inline fuse. If not you have blown the transformer that the wires are connected . Replace transformer. Russ