The problem

Installation Method Home Assistant OS
Core 2025.8.0 (issue first appeared after upgrade to 2025.8.0)
Supervisor 2025.07.3
Operating System 16.0
Frontend 20250806.0

Please see below for debug log information from multiple instances of setting volume at a level > 0 only to have it set back to 0.

Telnet messages setting to a volume > 0 were intentionally set using Denon device settings in HA. Telnet messages setting volume to 0 (MV00) were not intentionally sent. Source of this message is unknown. Message setting volume to 0 occurs after setting volume to something > 0 through HA UI as well as manually setting volume using the knob on the receiver.

Note: All automation related to this device have been disable. HEOS integration has been disabled.
(IP address of Denon receiver below has been substituted with "xxx.xxx.xxx.xxx")

2025-08-09 11:40:57.742 DEBUG (MainThread) [denonavr.api] Incoming Telnet message: PWON
2025-08-09 11:40:58.020 DEBUG (MainThread) [denonavr.api] Incoming Telnet message: MV36
2025-08-09 11:40:58.021 DEBUG (MainThread) [denonavr.api] Incoming Telnet message: MVMAX 89
2025-08-09 11:40:58.021 DEBUG (MainThread) [denonavr.api] Command MV36 confirmed
2025-08-09 11:41:27.861 DEBUG (MainThread) [denonavr.api] Incoming Telnet message: MV00
2025-08-09 11:41:27.862 DEBUG (MainThread) [denonavr.api] Incoming Telnet message: MVMAX 89
2025-08-09 11:42:23.951 DEBUG (MainThread) [denonavr.api] xxx.xxx.xxx.xxx Sending keep alive
2025-08-09 11:42:27.431 DEBUG (MainThread) [denonavr.api] Incoming Telnet message: PWON
2025-08-09 11:42:30.308 DEBUG (MainThread) [denonavr.api] Incoming Telnet message: MV43
2025-08-09 11:42:30.308 DEBUG (MainThread) [denonavr.api] Command MV43 confirmed
2025-08-09 11:42:30.318 DEBUG (MainThread) [denonavr.api] Incoming Telnet message: MVMAX 89
2025-08-09 11:43:11.091 DEBUG (MainThread) [denonavr.api] Incoming Telnet message: MV00
2025-08-09 11:43:11.091 DEBUG (MainThread) [denonavr.api] Incoming Telnet message: MVMAX 89
2025-08-09 11:43:53.955 DEBUG (MainThread) [denonavr.api] 1xxx.xxx.xxx.xxx: Sending keep alive
2025-08-09 11:43:53.977 DEBUG (MainThread) [denonavr.api] Incoming Telnet message: PWON
2025-08-09 11:44:53.956 DEBUG (MainThread) [denonavr.api] xxx.xxx.xxx.xxx: Sending keep alive
2025-08-09 11:44:55.964 DEBUG (MainThread) [denonavr.api] Incoming Telnet message: PWON
2025-08-09 11:44:55.964 DEBUG (MainThread) [denonavr.api] Incoming Telnet message: PWON
2025-08-09 11:44:55.964 DEBUG (MainThread) [denonavr.api] Incoming Telnet message: PWON
2025-08-09 11:44:55.964 DEBUG (MainThread) [denonavr.api] Incoming Telnet message: PWON
2025-08-09 11:44:55.964 DEBUG (MainThread) [denonavr.api] Incoming Telnet message: PWON
2025-08-09 11:45:08.049 INFO (MainThread) [denonavr.api] Timeout waiting for confirmation of command: MV43
2025-08-09 11:45:10.201 DEBUG (MainThread) [denonavr.api] Incoming Telnet message: MV43
2025-08-09 11:45:10.208 DEBUG (MainThread) [denonavr.api] Incoming Telnet message: MVMAX 89
2025-08-09 11:45:38.301 DEBUG (MainThread) [denonavr.api] Incoming Telnet message: MV00
2025-08-09 11:45:38.301 DEBUG (MainThread) [denonavr.api] Incoming Telnet message: MVMAX 89
2025-08-09 11:46:23.961 DEBUG (MainThread) [denonavr.api] xxx.xxx.xxx.xxx: Sending keep alive
2025-08-09 11:46:23.988 DEBUG (MainThread) [denonavr.api] Incoming Telnet message: PWON
2025-08-09 11:46:52.984 INFO (MainThread) [denonavr.api] Timeout waiting for confirmation of command: MV70
2025-08-09 11:46:55.157 DEBUG (MainThread) [denonavr.api] Incoming Telnet message: MV70
2025-08-09 11:46:55.164 DEBUG (MainThread) [denonavr.api] Incoming Telnet message: MVMAX 89
2025-08-09 11:47:23.271 DEBUG (MainThread) [denonavr.api] Incoming Telnet message: MV00
2025-08-09 11:47:23.271 DEBUG (MainThread) [denonavr.api] Incoming Telnet message: MVMAX 89

What version of Home Assistant Core has the issue?

core-2025.8.0

What was the last working version of Home Assistant Core?

core-2025.7.5(?)

What type of installation are you running?

Home Assistant OS

Integration causing the issue

Denon

Link to integration documentation on our website

No response

Diagnostics information

No response

Example YAML snippet

Anything in the logs that might be useful for us?

Additional information

No response