Google Nest

Nest Learning Thermostat 3rd Gen

Learning Thermostat Series • Smart Thermostat Controller

Nest Learning Thermostat 3rd Gen

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