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Michelle NguyenJul 30, 2025
What to do if my ClimateMaster ATA11U03 shows 'E4'?
- MMichelle DonaldsonJul 30, 2025
If your ClimateMaster Thermostat displays 'E4', it indicates a memory failure. In this case, the thermostat needs to be replaced.
To Next PageTo Next PageWhat to do if my ClimateMaster ATA11U03 shows 'E4'?
If your ClimateMaster Thermostat displays 'E4', it indicates a memory failure. In this case, the thermostat needs to be replaced.
Why does my ClimateMaster ATA11U03 display '--'?
If the room temperature sensor fails on your ClimateMaster Thermostat, the temperature display will show '--'.
General| Power Source | 24 VAC |
|---|---|
| Programmability | Yes |
| Application | Heat Pump Systems |
| Display | Digital |
| Control Type | Digital |
| Programmable | Yes |
| System Mode | Heat/Cool/Auto/Emergency Heat/Off |
| Backup Heat Control | Yes |
Covers essential safety warnings, installation requirements, and optimal thermostat placement.
Details the step-by-step installation process, including critical safety warnings and cautions for proper setup.
Configuration for remote sensor selection and defining space temperature sensing methods.
Settings for English/Metric units, display adjustment, and outdoor temperature offset.
Settings for DDC controller, deadband, auto mode, and maximum cycles per hour.
Configuration for display backlight behavior and keypad lockout with passcode.
Defines minimum cooling and maximum heating setpoints and how temperature is displayed.
Settings for fan speed selection and resetting the thermostat to factory defaults.
Procedure to enter and use the installer test mode for forcing heating or cooling operations.
Final checklist for installation verification and methods to terminate installer test mode.
How to select operating modes (Off, Heat, Cool, Auto) and control fan speed (LO, HI).
Adjusting temperature set points, understanding display lighting levels, and viewing remote sensor data.
Explains various timers that influence equipment operation like compressor timeguard and cycle limits.
Identifies and explains common error messages like sensor failure or memory issues.
Visual representation of the typical thermostat wiring connections to a heat pump unit.
A form for installers to record specific configuration settings chosen for the thermostat installation.
A record of changes and updates made to the document over time.
