Faulty pressure switch. System is locked out until replaced. Heat or system is not working at the moment. Tenant needs to ask owner for permission to continue with part. After pressure switch installed, the system turned on. There is inducer failure in furnace as well. I had to manually spin wheel to get system to stay on. Also the vent is not attached to roof, as soon as I realized I turned off system. Owner will replace vent stack himself so that he can run system while it vents out through room properly. Owner is aware of issue with inducer and vent stack. Charging for pressure switch only today.