Lennox 19V30 - User Manual

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507536-08 10/2021

Supersedes 8/2021

Lennox Industries Inc.

Dallas, Texas, USA

iComfort

S30

Ultra Smart Thermostat

Installation and Setup Guide

Main Page

Questions and Answers

T
Tara ShortSep 8, 2025
How to resolve Lennox 19V30 displaying 'Failed Flash CRC Check'?
- W
  William BirdSep 9, 2025
  To recover from a 'Failed Flash CRC Check' alert code on your Lennox Thermostat, a manual system power reset is required.
J
James EricksonSep 12, 2025
What to do if Lennox Thermostat shows 'Unknown Device Detected - DEVICE2'?
- L
  Laura PattonSep 12, 2025
  If your Lennox Thermostat displays 'Unknown Device Detected - DEVICE2', go to menu > advance settings > view dealer control center > equipment and press reset all equipment. This will allow the system to auto-detect any iComfort® components attached.
J
jennacrawfordSep 13, 2025
What does 'Low Ambient HP Heat Lockout' mean on Lennox 19V30?
- S
  Shane PenningtonSep 13, 2025
  The 'Low Ambient HP Heat Lockout' on your Lennox Thermostat is a notification only alert code and will automatically clear once the outdoor temperature rises above the low balance point.
C
Carrie AdamsSep 14, 2025
How do I clear 'Asynchronous Reset DEVICE2' on my Lennox 19V30 Thermostat?
- B
  brandonpaceSep 15, 2025
  To clear the 'Asynchronous Reset DEVICE2' alert code on your Lennox Thermostat, go to menu > settings > advanced settings > view dealer control center > notifications, select the alert code, and press the clear button.
K
Kevin McdonaldSep 16, 2025
What to do if my Lennox 19V30 displays 'Missing DEVICE2'?
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  Gabriel MarshallSep 16, 2025
  If your Lennox Thermostat displays 'Missing DEVICE2', cycle system power, and if the problem persists, clear it by reconfiguring the system.