Danfoss LX 420 User Manual

Table of contents
English ...................................................... 2 Français .................................................... 5
USER MANUAL
LX 420, 421
088L3353 - 01.01 57470

Danfoss LX 420 Specifications

General

Brand	Danfoss
Model	LX 420
Category	Thermostat
Language	English

Summary

Thermostat Overview and Introduction

Product Lineup: LXstat-420 & LXstat-421

Introduces the LXstat-420 with an external floor sensor and the LXstat-421 with a built-in room sensor.

Key Thermostat Features

Details adjustable set points, temperature display options (°C/°F), and factory reset functionality.

Getting Started: Thermostat Controls

Understanding Button Functions

Explains the purpose and operation of each physical button (A-I) on the thermostat.

Thermostat Operation and Display

Interpreting Display Icons

Deciphers important display symbols like clock function, wake, night, and heating status indicators.

Setting Temperature and Modes

Guides on adjusting comfort mode, night setback temperatures, and turning the unit OFF.

Advanced Functions and Troubleshooting

GFCI Safety Check and Reset

Provides instructions for testing the GFCI, performing monthly checks, and resetting it.

Factory Reset Procedure

Details the steps to restore the thermostat to its original factory configuration.

Error Code Diagnostics

Lists and explains error codes (E0, E1, E2) for identifying thermostat malfunctions.

Technical Specifications Summary

Outlines key technical data including power, load capacity, GFCI class, and operating temperature ranges.