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All of the smoke should be drawn into the fire. If this does not occur the appliance must be disconnected and the flue checked. Step 5. If there is an extractor fan in any room, this must be turned on and any doors between it and the fire left open, repeat the spillage test. Repeated operation of the spillage monitoring system whereby the OSD (oxygen sensing device/spillage monitoring system). If their is a problem with the ODS pilot going out after the stove has operated satisfactory, this indi