Fibaro Dimmer 2 installation issue


Hi all,

This is my first post here.
Recently i have wanted to start my home automation project, so i bought one fibaro dimmer 2 (i don’t even have a hub yet) to test if it fits well behind the switch and if it works.
After installing the module with momentary switch i pressed it once and light switched on, but just for a 1-2 seconds and turned itself off. This happens everytime i press the switch. I also tried to press and hold, but nothing happens.
I have a 3 wire electric installation and LED bulbs.
Can someone help me out with this? I am pretty bad at electrical installations…

(Robin) #2

Assume the LED bulb is dimmable? Most are not.

I think you need to force an auto calibration, it’s a lot easier to do via a hub but there a two ways without:

  1. as the module is not included to a hub yet, you can just turn off the power (main breaker) and then back on… don’t touch the switch. Lamp brightness should ramp up and down which is part of the auto calibration process. Wait for it to stop (give it a few minutes) and then test.

  2. if lamp doesent ramp up and down, try triple clicking the momentary switch, with each click being held for 5 seconds.

Hold 5 seconds
Hold 5 seconds
Hold 5 seconds

The above should trigger auto calibration same as option 1.

If that fails, please advice what colour the LED on the module is and if it’s blinking or solid.


Thank you very much for your help.
I just tried to reset the module following your instructions, but it doesnt work.
So i noticed that i have 2 different bulbs in my ceiling lamp. I guess this could be the cause of strange behaviour of the module so i unscrewed one of them and left the other (IKEA LED bulb).
Now when i hit the main breaker switch, the bulb starts flickering for 3-4 seconds making very quiet electrical noise, then lights up constant 100% for a moment and the process repeats itself.
I thought that it was the calibration but it loops this process without ever stopping (i waited for over 15 minutes and gave up)
Light on module is constant red.
Here are photo of my switch with attached module. Maybe i’m doing something wrong…



My IKEA bulb:

(Robin) #5

Why have you got Earth / Ground connected to the load terminal!


Well to be honest first time i tried to attach it the right way and absolutely nothing happened (no lights whatsoever) so i figured maybe the installation in walls was attached wrong and tried different combination.

(Robin) #7

Did you take a photo of the original wiring layout?


Yes, but original wiring was attached to basic switch (not momentary)
Its a double switch (but only one works with the ceiling lamp) if it matters
Here you go:

(Robin) #9

Can you post a better photo of the original switch (without wires is fine), front and back, so I can clearly see the writing on each terminal.

Looks like you have a two wire system + earth but need to be sure before I advise.


sure, but i can take and post the photos after i will come back home.

Hey man i really appreciate your help with this!


OK here are the photos. On the left is the new momentary switch and on the right old double basic switch


(Robin) #13

So you had two circuits before?

The one coloured green should be Earth but was wired as live.

The blue and brown wires look like the switch lives for two different circuits??


No i only gor one circuit. I bought the momentary switch along with the dimmer.
So how do i attach the cables to the dimmer and to the switch?

(Robin) #15

I need to see a photo of the original toggle switch and how it was wired before I can advise… I thought that was what you showed me above but that was two circuits???