General Assist Technical Reference
UTY-RNRYZ2 Temperature Limiting Range
Auto set temperature limitation does not retain the changed range
Known software issue affecting the UTY-RNRYZ2 controller
Issue summary: On the UTY-RNRYZ2, changing the temperature limiting range for Auto mode may not be carried out. After entering a new lower and upper limit and pressing OK, the Auto temperature range can return to the original setting.
1. Affected controller
| Controller | Function affected | Condition |
|---|---|---|
| UTY-RNRYZ2 | Set temperature limitation | Changing the temperature limit for Auto mode |
2. Symptom
When a user changes the Auto set temperature limit on a UTY-RNRYZ2, the new temperature range may not be retained.
Known issue: The supplied technical information identifies this behaviour as a bug in the UTY-RNRYZ2.
3. Example of the fault
- Open the temperature limitation setting.
- Select Auto. The displayed range is 18.0°C to 30.0°C.
- Change the limits - for example, set the lower limit to 20.0°C and the upper limit to 26.0°C.
- Press OK.
- On returning to the setting screen, the Auto range remains or returns to 18.0°C to 30.0°C instead of retaining the new values.
| Stage | Lower limit | Upper limit |
|---|---|---|
| Original Auto setting | 18.0°C | 30.0°C |
| Example requested setting | 20.0°C | 26.0°C |
| Result after pressing OK | 18.0°C | 30.0°C |
4. Resolution
The technical information states that this issue is corrected from UTY-RNRYZ3, with production starting in April 2019.
| Controller | Status |
|---|---|
| UTY-RNRYZ2 | Known Auto temperature-limit setting bug |
| UTY-RNRYZ3 | Issue stated as fixed from this model; production from April 2019 |
5. Service guidance
- Confirm the controller model before troubleshooting the setting behaviour.
- If a UTY-RNRYZ2 will not retain a changed Auto temperature limiting range, this matches the documented software issue.
- The supplied information does not provide a software update or field workaround for the UTY-RNRYZ2.
- The documented correction is the later UTY-RNRYZ3 controller.
Technical source note: This article is based on the supplied service information for the UTY-RNRYZ2 temperature limiting range. Only behaviour and corrective information stated in that source has been included.