Is your Norcold AC heater not working? Replace it with Norcold's Refrigerator AC Heater. This Norcold AC Heater has 225W and 110V AC power. It is compatible with Norcold's 1200, 1210 and 1211 refrigerator models. If your refrigerator's cooling unit is below the serial number, 11231146, then you will need Norcold's AC Heater 618872. The serial number can be found on the AC Heater unit itself. Hooks up to AC Hi and AC Lo on the power board.