Honeywell Home

1 field manuals · 12 error codes · 3 guides

Honeywell Home thermostats

Smart thermostat installation & troubleshooting: field service manual

Wi-Fi thermostats for 24 VAC systems: Nest Learning/Nest Thermostat, ecobee, Honeywell Home T-series/Lyric, Sensi, Amazon Smart Thermostat. Line-voltage models (e.g. for baseboard heat) are covered only by the safety notes.

3 components5 common failuresGoogle Nest, ecobee, Honeywell Home / Resideo, Emerson Sensi, Amazon

Error codes

164 Heat pump needs service 168 Wi-Fi radio fault 170 Internal memory error 171 Date and time not set 173 Built-in temperature sensor fault 175 AC power restored 177 Indoor sensor error 178 Outdoor sensor error 181 / 182 Air filter reminder 399 No internet connection 400 No Wi-Fi signal 508 Wi-Fi not set up

Guide · Thermostat

Smart thermostat offline / Wi-Fi problems

Separate network problems (router, credentials, internet) from power problems: many smart thermostats switch the radio off when batteries or borrowed power run low. Read the brand's code first.

5 steps ~30 mineasy

Official Honeywell Home manuals & support

Honeywell Home thermostat wiring help

Brand names identify appliances only. OnCall Tech is not affiliated with or endorsed by Honeywell Home.