Google Nest
Nest Learning Thermostat 3rd Gen
Learning Thermostat Series • Smart Thermostat Controller
Quick Info
Type
Smart Thermostat
Application
Residential HVAC
Probe Inputs
1
Relay Outputs
0
Communication
Wi-Fi 802.11 b/g/n (2.4GHz/5GHz), Bluetooth LE, Thread
Panel Size
84 diameter x 31.3 depth mm
Premium smart thermostat with machine learning, auto-schedule, and high-resolution display. Programs itself based on your habits and preferences.
Technical Specifications
Display & Interface
| Display Type | LCD Color |
| Display Digits | - |
| Buttons | Rotating ring + press |
Power Supply
| Voltage | 24V AC |
| Voltage Range | 20-30V AC |
| Frequency | 50/60Hz |
Sensor Inputs
| Probe Inputs | 1 |
| Probe Type | Internal + Remote Sensor compatible |
| Temp Range | -°C |
Relay Outputs
| Relay Outputs | 0 |
| Relay Rating | - |
Physical
| Panel Size | 84 diameter x 31.3 depth mm |
| Depth | - mm |
| IP Rating | - |
| Weight | 250 g |
Operating Conditions
Wiring Terminals
| Terminal | Function | Type | Wire Color |
|---|---|---|---|
| 24V Heating Power | Input |
Red
|
|
| 24V Cooling Power | Input |
Red
|
|
| Heating Stage 1 | Output |
White
|
|
| Heating Stage 2 / Aux | Output |
Brown
|
|
| Cooling Stage 1 | Output |
Yellow
|
|
| Cooling Stage 2 | Output |
Light Blue
|
|
| Fan | Output |
Green
|
|
| 24V Common | Input |
Blue
|
|
| Heat Pump Reversing Valve | Output |
Orange
|
|
| Humidifier/Dehumidifier/HRV | Output |
Various
|
Important: Always disconnect power before wiring. Verify terminal numbers with the actual controller label before connecting.
Parameter Settings
| Code | Parameter | Range | Default | Description |
|---|---|---|---|---|
| TEMP_UNIT | Temperature Unit | F/C | F | |
| HEAT_TEMP | Heat Temperature | 40-90°F | 68 °F | |
| COOL_TEMP | Cool Temperature | 50-90°F | 76 °F | |
| FAN_MODE | Fan Mode | On/Auto/Schedule | Auto | |
| AUTO_SCHED | Auto-Schedule | On/Off | On | |
| HOME_AWAY | Home/Away Assist | On/Off | On | |
| ECO_TEMP_H | Eco Heat Temp | 40-70°F | 50 °F | |
| ECO_TEMP_C | Eco Cool Temp | 76-90°F | 85 °F | |
| EARLY_ON | Early-On (True Radiant) | On/Off | Off | |
| SUNBLOCK | Sunblock | On/Off | On | |
| AIRWAVE | Airwave | On/Off | On | |
| BRIGHTNESS | Display Brightness | Auto/1-10 | Auto |
Error Codes
E195