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Power does not turn on / Power is turned off
Power does not turn on.
Check whether the power plug is correctly inserted into the power outlet. link
Power automatically turns off.
The sleep timer is set. Turn on the power again. link
“Auto Standby” is set. “Auto Standby” is triggered when there is no operation for a set amount of time. To disable “Auto Standby”, set “Auto Standby” on the menu to “Off”. link
The power to this unit does not turn off when you press the Power operation button. “ZONE2 On” or “ZONE3 On” appears on the display.
Power in either ZONE2 or ZONE3 is on. To turn off the power of this unit (standby), press the ZONE2 ON/OFF or ZONE3 ON/OFF button on the main unit or press the ZONE SELECT button on the remote control and select a zone before pressing the POWER 
button.
The power to this unit does not turn off when you press the Power operation button. “HEOS On” appears on the display.
A HEOS device on the same network is playing an input source from this unit. Stop playback on the HEOS device when turning this unit off (setting it to standby). The power of this unit will turn off automatically after around 20 minutes.