Nest thermostat: H157 or H158: Heat Link removed from the app
H157: the Heat Link has been removed from the app. H158: it has been removed from your account and the thermostat has disconnected from the app.
Applies to: Nest Thermostat E with a Heat Link. What you see: a code.
Codes this page covers: H157 H158.
What Google says to do
- For H157, reconnect the Heat Link in the app (Settings, Add product) and enter its 6-character pairing code if asked; the code is under the Heat Link cover near the left screw hole. Reset the Heat Link to factory defaults first if it can’t be connected.
- For H158, reset the thermostat to factory defaults (press the ring, Settings, Reset, All Settings), then set it up again in the app to reconnect it and the Heat Link.
- If the message stays, contact Nest support.
Source
Google’s own help page, read on the date shown.
- Google Nest Help: Troubleshoot Nest thermostat help codes — Nest Learning Thermostat (1st to 4th gen), Nest Thermostat E and Nest Thermostat; H codes only where a Heat Link is installed. support.google.com Checked 2026-09-29.