Customer advised furnace not powering on also thermostat shut off and unable to turn on. Customer checked the service panel to ensure that fuses were not blown. Upon arrival verified no power to unit. Inspected service panel and insured no switches were tripped. Also checked all outlets in room and verified only outlet for furnace not functional and no power. Checked to ensure switch for furnace was on which it was. Went upstairs and checked emergency switch and found emergency switch was switched off. Proceeded To flip switch and verify power to unit was on. Advise customer to raise the temperature on thermostat a few degrees above room temperature in order for unit two cycle on. Verified unit was functional and operational with no issues.