I have a different thread going that addressed my issue of 240v power connection. I have everything corrected now but need help with my Refrigerator. I know I have good power to the fridge receptacle, but the fridge is giving me an error code E3. I get the code regardless if I try LP or 120v. The make is Dometic and the model is RM1350SLMX. I googled E3 code and it talks about a recent button, but I don’t believe this fridge has the reset button I read about. Any ideas how to clear the E3 code or is my circuit board toast?

Disconect 12v power to the board to reset

You are confusing having 120 volts with refer operation. ALL 120 volts does for the refer is power the 120 element when on 120. So, you connected to 220 volts. THAT usually blows the 120 element FUSE on the Refer control board and sometimes burns out the 120 element. It takes just 12 volts to operate the refer controls. You have that since the refer powers up. The ONLY reset button is on the outside burner flue cover and IF that button trips, you will have NO power to the refer at all to power the refer controls. Check the fuses on the rear refer control board. Rarely does a 220 hit destroy the Refer board on a Dometic. Doug

So I’ve disconnected 120v AC power to the trailer and have only 12v power feeding the trailer. I tried disconnecting 12v power for a few minutes but as soon as I restore 12v power I immediately get the E3 error code. I only know of two fuses on the 12v side. One inline 4 amp and one mini 5 amp in the circuit board. Both fuses test good. I know I have 12 volts feeding the control board, I know the fuses are good, but still get the E3 code. I don’t see any type of reset button and since I have the display reading E3 and 12v power to the circuit board, I don’t think a reset button, (if there was one) is my problem. Unless someone can steer me in another direction, or tell me something different to check, I think my next move is to spend the $200 and buy a new circuit board. Thanks for the suggestions and if anyone has any more, I surely welcome them.

Did you check the GLASS fuse on the board? That is the 120 element fuse.It is 5 amp. I have never seen the E3 code but the manual states cooling unit problem which is a catch all for any problem causing lack of cooling. There is nothing on a Dometic that could tell you, you have a bad cooling unit. DougPS did you try this?To preform a diagnostics test: 1) Turn off the refrigerator with the ON/OFF button. 2) Press and hold the TEMP.SET button, then press the ON/OFF button. 3) Release the TEMP.SET button. Each subsequent press or the TEMP.SET button will toggle through the list of functions in the table below:

I’d still find the hi limit reset switch located on the stack for the burner and electric heating element and press it to reset the hi limit switch

Dometic Refrigerator E3 code | Good Sam Community

dougrainer
Nomad
May 09, 2019
wnjj wrote:
dougrainer wrote:
ChuckSteed wrote:
I’d still find the hi limit reset switch located on the stack for the burner and electric heating element and press it to reset the hi limit switch

If the Hi limit switch is tripped, you will NOT have power to the refer and controls. The OP does have power to his eyebrow board. Doug

So apparently this wasn’t the case with the OP’s fridge as he got an E3 code with that reset tripped.

True, His model must be a completely different model than the rest of the Dometics. That temp switch is supposed to kill all 12 volt power to the refer, UNLESS someone has rewired that switch. That switch usually has 2- red wires to it. His shows a red and yellow. Doug
mxdad777
Explorer
May 09, 2019
dougrainer wrote:
wnjj wrote:
dougrainer wrote:
ChuckSteed wrote:
I’d still find the hi limit reset switch located on the stack for the burner and electric heating element and press it to reset the hi limit switch

If the Hi limit switch is tripped, you will NOT have power to the refer and controls. The OP does have power to his eyebrow board. Doug

So apparently this wasn’t the case with the OP’s fridge as he got an E3 code with that reset tripped.

True, His model must be a completely different model than the rest of the Dometics. That temp switch is supposed to kill all 12 volt power to the refer, UNLESS someone has rewired that switch. That switch usually has 2- red wires to it. His shows a red and yellow. Doug

I have no idea what other models of Dometic refrigerators are out there, but for reference, the model number on my Dometic is RM1350SLMX. I highly doubt that anyone has touched the unit since coming from the factory. The trailer was bought brand new by an acquaintance after they lost their house in a fire. They were planning on living in it until they could rebuild their house. Plans changed and they ended up purchasing a different home. They only lived in it for a couple of months and never had any problems with anything in the trailer. I bought the trailer from them a month ago and everything worked great until my 220v blunder. Anyway, everything is working great again now and the wife and I are anxious to hit the road. Thanks again for the help and input.
dougrainer
Nomad
May 09, 2019
I just checked the wiring schematic for all variations of the 1350. ALL show 2 red wires going to that Limit switch. AND, if that is tripped, there is NO 12 volt power to the refer controls per the wiring schematic. Doug
burchmorgand
Explorer
Aug 30, 2019
You sir are a scholar and a gentleman! Thanks so much! I was pulling my hair out, trying to troubleshoot this blasted E3 code. All I kept seeing was “reset the high limit switch”. Where!? No mention of it in the manual.

Then I saw your pic, went to my unit, pushed that little button in and voila!

Thanks a million!

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