Propane characteristics Safety reminders If you smell gas Uncapped lines Safety relief valve Read your tank gauge Appliance safety Lighting pilots Maintenance Gas grilling tips Weather emergencies Download PDF version Disclaimer       Appliance safety All appliances should be installed and repaired only by qualified technicians. Improper ventilation can starve the combustion process in the appliance and create a situation that could produce toxic carbon monoxide gas. Carbon monoxide is an odorless and colorless gas that, in sufficient amounts, may be deadly to humans. Usually, headaches and/or flu-like systems are initial signs of carbon monoxide poisoning. If you suspect that any of your appliances have been improperly vented, you should discontinue using them and contact your propane supplier or local fire department immediately for an inspection. An appliance gas control is a precision mechanism that may malfunction if it is exposed to water from flooding, storms, or any other damaging environments. A flooded gas control must be replaced by a qualified gas appliance technician. Damaged gas control valves must be replaced.