Upon arrival Customer stated lighting strike hit close by home during recent storm, replaced multiple breakers in home and had 24 volt transformer replaced. Thermostat still would not come on, replaced Thermostat and still nothing worked. Double checked new 24volt transformer, transformer working properly. Noticed fuse at transformer was blown. After isolation of low voltage wires fuse would still blow from the main circuit board. Board possibly has been damaged by recent surge. Possibilities of outdoor and ECM motor in furnace is bad as well. Cannot further evaluate system until main circuit bord replacement. Customer stated they will talk to insurance company and see what they will do.