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Nest Thermostat Error Codes & Fix Guides

Nest Thermostat display showing CODE LIST — FixCode Guide error code graphic

All FixCode Guide coverage for Nest thermostat error codes: start with the complete code list, or jump to a deep-dive guide for a specific code. Everything is verified against Nest manufacturer documentation.

Guides in this section

Nest Thermostat Error Codes List: Every E, N & TD Code ExplainedNest Thermostat E195 Error Code: Meaning, Causes & FixNest Thermostat E74 Error Code: Meaning, Causes & FixNest Thermostat No-Power Codes (E23, E24, E72, E73): Meaning & FixesNest Thermostat Wire-Not-Detected Codes (E157, E158, E184, E194): Meaning & FixesNest Thermostat Overcurrent Codes (E52–E58, E102–E108): Meaning & FixesNest Thermostat C-Wire & Low-Power Codes (N260, N261, E297): Meaning & FixesNest Thermostat E294 Error Code: Meaning, Causes & Fix

Most searched Nest thermostat codes

CodeMeaning
E74No power to Rh wire detected — Google's master help-code table groups E4, E24 and E74 under exactly that sentence, and routes the group to 'Troubleshoot power'.
E195No power to R wire detected — Google's master help-code table defines E195 with exactly that sentence, and routes it to 'Troubleshoot power'.
E294R wire is required — Google's master help-code table defines E294 with exactly that sentence, and routes it to 'Troubleshoot wires in Home app'.