Have been reading the owners manual for our Rheem HP and the White-Rodgers T-Stat for tidbits of info on the working of the unit(s).
The troubleshooting part of the HP states that the outdoor condensor may have frost. It then said that if ice builds up to call the technician.
Question is, what will cause the outdoor unit to ice?
Clogged coils is obvious. But what else?