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Ask Michael Reush Your Own Question
Michael Reush
Michael Reush, RV Technician
Category: RV
Satisfied Customers: 3249
Experience:  Serving the rv industry since 1977
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Can get my domestic thermostat to work no error message

Customer Question

Can get my domestic thermostat to work no error message
Submitted: 2 years ago.
Category: RV
Expert:  Michael Reush replied 2 years ago.

Hi, can you describe the thermostat ex. 4 button, 5 button ect. thanks

Customer: replied 2 years ago.
Its a domestic has 3 buttons a plus a minus and on off
Expert:  Michael Reush replied 2 years ago.

thanks does it look like this?

Customer: replied 2 years ago.
I cant open your pic
Customer: replied 2 years ago.
Display works but nothing works
Expert:  Michael Reush replied 2 years ago.

thanks,that the display is working, that tells me the thermostat if receiving power.....................can you take a photo of the thermostat or find a part number on it................

Customer: replied 2 years ago.
No Ac no fan
Expert:  Michael Reush replied 2 years ago.

once I can determine which thermostat you have, I can direct you in the next troubleshooting process...........the thermostat sends 12volt signals to a control inside the ac and uses a 12volt signal to turn on 12v/120 relays to energize the appropriate component fan / compressor

Customer: replied 2 years ago.
Dometic 540;4579;4595;640
Expert:  Michael Reush replied 2 years ago.

thanks thats a single zone lcd thermostat. it is a 3 wire thermostat that has 1 positve wire, one negative wire, and a data wire, which sends specific resistance to the control to tell it what to do....................as you have power there you have 12v and ground............................so.. this means you either have a bad thermostat (most likely) or a bad control (much less likely)

Customer: replied 2 years ago.
Its brand new
Customer: replied 2 years ago.
Any way to make Ac work till I get another
Expert:  Michael Reush replied 2 years ago.

I understand, you might try a reset, which I will give you, and make sure the wires are connected, and have not fallen off at the thermostat and at the control in the ceiling.... go to page 3 and do the system initialization

Customer: replied 2 years ago.
No help I cant get that up
Expert:  Michael Reush replied 2 years ago.

ok, make sure the thermostat is in the off position,,,,,,,,,,press the + button at the same time press the on/off mode for 3 seconds the display should show --- the press the on/off button again, this completes the reset

Customer: replied 2 years ago.
Now its flashing e1
Expert:  Michael Reush replied 2 years ago.

thanks the e1 error code is a communication error.................this is either the thermostat is not able to send a signal to the control, the connections at the thermostat or the control,,,,,,,,the wire between the two or the control...........

Customer: replied 2 years ago.
now what
Expert:  Michael Reush replied 2 years ago.

unfortunately, you cannot do a repair in the field at this time,,,,,,,,,,I would replace the control and the thermostat as they are fairly inexpensive, or replace the thermostat then the control if that does not resolve the issue.................If I had to guess, and I have seen so many bad thermostats of that type, I would lean towards the thermostat.......