Well that was my first thought when I opened the topic(L and N), but then I followed ur instructions for instal on L only after relay.I'm going to test that too now. And I also expect a better result too. Just made me thinking what would be better if MOV is placed closer to switch or to power consumer?
I need to revert MOV on the fan, across the relay, instead of L and N. If I switch it OFF with or without dimmer it corrupts arduino, not LCD !Then it can be switched manually if I use it trough my dimmer, where I have pf capacitor and resistor in it. If I switch it off or on with dimmer I can get just LCD error sometimes. Which leads me to the point that RC snubber is needed for fan.