Went to check out two wall mounted heat pumps, both only working in EM heat. The first one, compressor and condenser fan not coming on. No schematic with unit. Compressor windings and dual cap check out. Didn't have 240v to compressor. Outdoor temp about 38 deg. at the time. Do these systems have a comp. lockout temp.? Didn't see a freeze stat. The second system will work on Em heat and will also work in cooling, but no compressor operation in heat mode. This is the first time I've looked at this type of system so any advice would be useful. Thank you