Why does 'Locked' appear on my Robertshaw Smart Sense LCD, and the heating or cooling won't operate?
The 'Locked' message on your Robertshaw Thermostat LCD indicates that the outside air temperature is either too high to require heating or too low to require cooling. The HO = XX and/or CO = XX values are inhibiting heating or cooling calls. Change these values in the Advanced Installer Menu.
How to fix Robertshaw Smart Sense when outside air temperature display is showing dashes?
If the outside air temperature display on your Robertshaw Thermostat is showing dashes, it indicates that the outside air temperature sensor has either failed or is not fitted. Check the wiring and the outside air sensor. Replace the outside air sensor if necessary. You can also change TT = AO to TT = RS in the Advanced Installer Menu.
Why is my Robertshaw Smart Sense temperature display inaccurate?
An inaccurate temperature display on your Robertshaw Thermostat could be due to several reasons. Air leaking from the wall cavity into the thermostat can affect the sensor; plug any holes in the wall with tape to prevent these leaks. The internal temperature sensor might be folded back inside the thermostat; carefully reposition the sensor so it's behind the sensor opening. External heat sources like lamps or drafts from open doors can also impact accuracy; move these sources away from the thermostat. Finally, the sensor calibration setting might be incorrect; adjust the C1 = XX value in Advanced Installer Mode to correct the perceived inaccuracy.
General| Power Source | Battery, Hardwired |
|---|---|
| Programmability | 7-Day |
| Features | Filter Change Reminder |
| System Switching | Manual |
| Compatibility | Heat Pump Systems |
| Temperature Range | 40°F - 90°F |
| Type | Programmable Thermostat |
Guidance on correctly mounting the thermostat to ensure accurate ambient room temperature readings and proper installation.
Steps to access the Advanced Installer Menu, including required PIN entry and initial display.
Procedures for navigating and adjusting settings within the Advanced Installer Menu, and exiting the menu.
Instructions for connecting an outside air temperature sensor to the thermostat's TT terminals for accurate readings and advanced control functions.
Connecting a remote sensor to measure temperature away from the wall controller, disabling the internal sensor.
Averaging temperatures from multiple sensors (internal and remote) for room temperature control.
Details on the thermostat's integrated ModBus capabilities for remote PC or DDC system control and monitoring.
Setting a low outdoor temperature threshold to automatically engage emergency heat mode.
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