Possibly new mystery with Dometic AC E7 Error Code

[journeydog]

Many of the above comments are very helpful. The following does not discuss your 'E7' code display but, the cure could be within.

I also have a Dometic thermostat and suffered a couple of nights in a cold A/C induced climate - when it wasn't needed. (The A/C would come bursting alive in the middle of the night.) This was during the maiden/shakedown voyage, so I was pretty clueless - and I may have retained that characteristic. I invented a lot of new cuss words until I discovered that the Dometic controller indicated (in very small lettering) that the current "time-of-day" was programmed inappropriately (my bad).

Check your t-stat's "time-of-day" - mine was set to 'pm' rather than 'am' - or vice-versa, as it should have been. i.e., 10 in the morning is not 10 'pm'. After I corrected it, all was good. (I still have some issues with the thing but, it is definitely not cooling down all night as before.)

"To err is human - to really screw up takes a computer." Duh, the Dometic T-stat is microprocessor-controlled and only does what you tell it to do.

[RivetzCarlAS]

I too have that issue with error code E7. Brand new 2022 25 Int’l. Trying to run only one ac. Plugged into the 20 amp connection of a 7000 watt generator. Checked all connections at every source multiple times. Reset thermostat hard reset. Unplugged cord from rig and RE plugged. Unplugged at source of power as well as reset. Again and again I keep getting e7 error. I also have soft starts on both acs. Still no power. Just error message. All breakers and fuses checked and are
Ok.

What gives ??