Mh, your thing and item definitions look good on first sight. Think we need some more information to figure this out:
See How to ask a good question / Help Us Help You No. 10
Describe your environment
What version of openHAB are you using? What snapshot version (if relevant)? Are you Windows, iOS or Linux? If Linux, is it natively or in Docker/Vm?
Some categories provide you with a template to fill in:
- Platform information:
- Hardware: CPUArchitecture/RAM/storage
- OS: what OS is used and which version
- Java Runtime Environment: which java platform is used and what version
- openHAB version:
- Issue of the topic: please be detailed explaining your issue
- Please post configurations (if applicable):
- Items configuration related to the issue
- Sitemap configuration related to the issue
- Rules code related to the issue
- Services configuration related to the issue
Also:
- Do you have other yamahareceiver items working?
- Have you tried without
volumeDbMin, volumeDBMax
statements? - What happens when sending a command to the Dimmer item?
- Have you tried setting the yamahareceiver binding into debug mode?