Symptoms
- Powers off after a set amount of time consistently
- Shuts off during loud or bass-heavy scenes
- Shuts off and won't restart for a few minutes
- Turns off when switching inputs
Likely causes
- CommonSleep timer set and forgottenMany receivers have an auto-sleep feature that can be set accidentally via remote.
- CommonOverheating shutdownPoor ventilation combined with high volume can trigger a thermal cutoff.
- PossibleProtection mode from a speaker or wiring issueA short or overload especially during loud passages can trip protection.
- PossibleHDMI-CEC command from another device turning it offA TV or other CEC device can send a 'power off' command to connected equipment.
What to do
- Check the receiver's sleep timer setting in the menu and disable it if set.
- Note whether shutoffs correlate with loud/bass-heavy content, which points to protection mode or overheating.
- Improve ventilation around the receiver and reduce sustained high volume.
- Check and reseat all speaker wire connections for shorts, as described in the protection mode troubleshooting steps.
- Turn off HDMI-CEC on the TV and other connected devices to rule out an unwanted power-off command.
- If it shuts off consistently after the same amount of time regardless of volume, suspect the sleep timer over other causes.
When to call a pro
If shutdowns are tied to loud passages even after checking speaker wiring, have a technician check the amplifier and cooling system.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.