Responded to call for attic fan installed on devious visit is no longer working. Upon arrival customer advised we installed gable fan previously and now it no longer is powering on. Inspected fan. Upon entry to attic found gable fan is operating. Advised customer fan is operating properly at this time. Explained how the exhaust fan thermostat operates. Found no other issues at this time. Left customer options for future work. Thank you. Eric Messer.