Unfortunately there seem to be a lot of people having issues with the RF range for Homey. See for example: Z-wave range of only centimeters
For me, this is a big disappointment. I should not have to buy additional nodes to strengthen a z-wave signal to a device that is only 5 meters from my Homey. My KaKu control station has no issues with ranges larger than that. So I really think it is a Homey specific issue, also judging the amount of people having problems with the range.
I really hope this will be solved in the near future. I like Homey and am patient, but this is basic functionality that SHOULD work.