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© 2009 Danfoss Inc.

Part No. 088L5133

English .................. 1

Français ................ 3

Español ................. 5

57145 08/09 (DJU)  © 2009 Danfoss Inc.

U S E R   M A N U A L

Contents

Introduction

The Danfoss LX thermostat combines elegant simplicity with 
advanced technology and features a large, easily read temperature 
display and Easy2Use buttons for simple operation. The backlit 
display is activated by the first press of a button. All Danfoss LX 
thermostats have GFCI (Ground Fault Circuit Interrupter) protec-
tion to ensure maximum safety.

Setting the temperature 

To set the temperature, press the UP or DOWN button until the 
required temperature is shown on the display.
The thermostat will calculate the best way to control the heating 
in order to obtain the required temperature. Minor adjustments 
should first be made after a few hours, depending on floor heating 
design. 

Ground Fault Circuit Interrupter (GFCI)

The thermostat has a built-in GFCI that ensures personal safety in 
case of ground faults.
It is important that the GFCI is checked monthly.

Checking the GFCI

Testing can only be performed while the thermostat is calling for 
heat. Adjust the setpoint until the heating symbol ( ) appears. 
Use the 

Up

 button to increase the heating demand and then press 

the 

OK

 button. Wait 10 seconds to allow the thermostat to adjust 

to the new setpoint. Then press the 

TEST

 button on the top of 

the thermostat. The test is successful if the red light in the 

TEST

 

button lights up and 

GROUND FAULT

 is shown on the display. If 

this does not occur, check the installation/contact your electrical 
installer. Press the 

Standby/Reset

 button to reset the GFCI.

The red light should go out and the display returns to normal ap-
pearance.

Up button

OK button

Down button

Standby button

Reset GFCI

GFCI test button

Non-Programmable 088L5133 

English

Introduction ................................................................................ 1
Setting the temperature  ............................................................ 1
Ground Fault Circuit Interrupter (GFCI) ..................................... 1
Checking the GFCI ..................................................................... 1

Settings ....................................................................................... 2
Standby ....................................................................................... 2
Error messages ........................................................................... 2

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