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Hi! My name is ***** ***** I can assist you with this. I may need some additional information from you first in order to give a complete answer.
Which thermostat do you have? Is this a Dometic Single Zone or a Comfort Control II version?
Do you have the User's Manual for this?
I usually like to know exactly what I am working on here, but I an tell you that an "E-4" error is an open circuit or outdoor temp sensor fault on a heat pump version A/C and may be a defective part of just a bad connection were it comes into the control board. Only the heat pump portion is locked out. The air conditioner, fan and furnace modes will still work. If you need the User's Manual I can provide that once I know which thermostat you have. If you need more here please get back to me as all follow ups are included in our fee and there is no time limit.
Just following up here on your question. I am wondering if you perhaps missed my earlier response or did you get this resolved? Easy to do with the large amount of e-mail most of us get these days! If you need me to resend it, please let me know. Thanks