ᐅ Air source heat pump – is ice formation normal?

Completely normal because there is no condensate drain present.

Thank you all… that reassures me 🙂

It is not the case for us, but we also routed the condensate pipe 1 meter (3 feet) deep into the ground and surrounded it with plenty of coarse gravel...

Same here. However, I would occasionally remove the icicles.

Slowly, things are improving for us because we have turned positive. It is important that everything works properly above and that air circulates.