What do the error codes E1:00, E2:00, E3:00, and E4:00 mean?

E1:00 indicates a cold water NTC error that prevents the cooling function from starting, and E2:00 indicates a hot water NTC error that prevents the heating function from starting — both require contacting the local service agency. E3:00 indicates either a temporary low water pressure or water shortage, and the machine will return to normal once water supply resumes. E4:00 is a dry heating alarm; you should power off and power on again, and contact the service agency if the problem persists. (Page 15)