In article ,
Harry Bloomfield writes:
Hi,

One of those small wall mounted Season A/C units suffering lots of ice
formation upon the heat exchanger matrix. The diagnosis is that the
system needs to have the gas topped up.

Sounds like BS to me.
It should have a temperature sensor on the heat exchanger to detect
freezing, which should switch it off. Cause might be airflow blocked,
or operating it when air temperature is well below its designed min
operating temperature.

--
Andrew Gabriel