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Nest / Google Error Codes
Google Nest smart thermostats and home devices
8 error codesthermostat
Nest / Google thermostat Error Codes
E1
No Power to Rh Wire — the thermostat is not receiving power from the heating system.
🚨 Critical$0–$100 (fuse replacement) to $200+ for wiring repair
E2
No Power to Rc Wire — the thermostat is not receiving power from the cooling system.
🚨 Critical$0–$200
E74
No Power to Common Wire (C-wire) — the thermostat is not receiving continuous power.
⚠️ Warning$0–$150
W5
No Power to W5 Auxiliary Heat Wire — the auxiliary or emergency heat circuit is not receiving power.
⚠️ Warning$100–$300
E195
Delayed heating or cooling — system is taking longer than expected to reach temperature.
ℹ️ InfoFree — check filter and settings first
E74
No power to Rc wire — the 24V power wire from the cooling system transformer is missing or not connected.
🚨 Critical$0–$200
E295
Low battery — the thermostat battery is critically low and needs charging.
⚠️ Warning$0–$150
N262
Nest Unable to Control System — the thermostat is connected but cannot activate heating or cooling.
🚨 Critical$100–$500
Related Troubleshooting Guides
Guide
Refrigerator and Thermostat Error Guide
Troubleshooting guidance for cooling, open-door, sensor, and HVAC control related error messages.
Guide
E1 first steps guide
The first checks to make when you see error code E1.
Guide
E1 meaning and causes guide
A clearer explanation of what E1 usually means and what tends to cause it.