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Old 04-17-2021, 09:18 AM   #1
Smokey946
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M.O.C. #22270
Dometic Penguin ii E4 Error

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
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Old 04-17-2021, 01:35 PM   #2
DadsHemi
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M.O.C. #20472
That’s a lose of communication code, there is a junction box with the thermostat wires in the main unit that could be loose.
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Old 04-17-2021, 01:36 PM   #3
Smokey946
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M.O.C. #22270
Ok, Thanks,

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