HT220 Operator’s Manual Controls - 27 Center Console CMW Item Description Notes 2. Wait to start indicator Light goes out when engine is ready to start. 3. Warning ignition “On” indicator Buzzer sounds when engine is not running and the ignition switch is on. 4. Low hydraulic fluid indicator Light comes on when low fluid switch is pressed and fluid is low. 5. Air filter indicator Light comes on when the air filter is dirty.