Hi By E1 error it means
Loss of communication between the Single Zone LCD thermostat and the module board. LCD will cycle between E1 error.
Check the link for regular maintenance Of the LCD thermostat.
If it doesn't help then you have to replace the LCD thermostat.
Ajin http://www.google.com/url?sa=t&rct=j&q=dometic%20model%203313192%20&source=web&cd=1&ved=0CCwQFjAA&url=http%3A%2F%2Fmanuals.heartlandowners.org%2FHeating-Cooling%2FA-C_Units%2FDometic%2FDometic_Single_Zone_LCD_Thermostat_Operating_Instructions.pdf&ei=hOg0T7OUNIjkrAer4Ny6Dw&usg=AFQjCNEn2y9-ItUcF2KRJZ0dm0Ftrq8Jhw
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