The inducer was turning on but no flame. The furnace was showing an error code of -limit open. Found the limit switch is going bad. Moved the prong on the output side and the furnace turned on. Bent the prong and cycled several times. The furnace is operating properly but the limit switch needs to be replaced before the switch fails. There is also no service switch at the furnace. Customer is going to have his electrician take care of it.