What is an ODS and how does it work?
The ODS is an oxygen detection safety pilot system. It is designed to shut off the gas supply to the heater if the oxygen content in the room drops to 18% from a normal 21%+. In this event the pilot flame actually lifts off the thermocouple cooling it down and causing the gas valve to close and the heater to shut off. Also, each ODS has a tamper resistant pilot orifice assembly, so do not try to drill or clean out the ODS pilot with a hard object as you will damage it. Follow the cleaning instructions located below.