Dometic Penguin ii E4 Error

[Smokey946]

Fellas,

Just got my 3791RD out of its winter storage and started to open everything up when I noticed that my Dometic single zone thermostat was flashing E4. This runs the Penguin ii ac bedroom ac which does not have a heatpump option. I've checked the wires on he ac and everything seems tight. The unit turns on and seems to work as it should. I am going to replace the unit with a micro air thermostat however I would like to fix this error first. Looking for options.

1. Replace the ac board
2. Replace the freeze sensor
3. Just replace the thermostat.

Thanks guys for your help

[DadsHemi]

That’s a lose of communication code, there is a junction box with the thermostat wires in the main unit that could be loose.

[Smokey946]

Ok, Thanks,

I'll open trace the wires back and take a look.