Dometic CFX3 35 / 45 / 55 / 100 fault codes
The 7 fault codes below are the ones that apply to this Dometic portable cooler family. The other 1 Dometic portable cooler codes in our database belong to different model families — they are listed further down so you do not troubleshoot against the wrong table.
Covered model numbers
CFX3 35CFX3 45CFX3 55CFX3 55IMCFX3 100
Not on the list? Check the rating label before you troubleshoot — the code table below will not apply. Where to find it →
Fault codes on the Dometic CFX3 35 / 45 / 55 / 100
The cooler stopped running on 12/24V DC because the incoming supply voltage dropped below … Warning 01 / 02 (NTC sensor) warning
The cooler's temperature sensor (an NTC thermistor) reads as an open circuit (01) or a sho… Warning 03 / 43 (communication) warning
An internal communication fault between the cooler's electronic components (for example di… Warning 32 (fan overcurrent) warning
The cooling fan is drawing more current than allowed, which the controller treats as a fan… Warning 33 (compressor start) warning
The cooler's controller tried to start the compressor but it did not start, so the control… Warning 34 (compressor speed) warning
The compressor is running but cannot reach or hold its target speed, so the controller rep… Warning 35 (overtemperature) warning
The temperature of the cooler's electronic controller has risen too high, so it stops the …
Codes that do not apply to this model
These 1 codes exist on other Dometic portable coolers. If your unit is showing one of them, it is not from this family — re-check the model number on the label before acting on any of these.
Where the model number is
On the underside or back panel of the cooler, next to the DC input.
Sources
- !ALERT [E31] - Low voltage | CFX3 Coolers | Support — Dometic (Dometic CFX3 Coolers support / alert & warning codes)
- What is the battery protection system? | CFX3 Coolers | Support — Dometic (CFX3 3-stage battery protection)
- !WARNING 02 NTC short circuit SZ & DZ LARGE | CFX3 Coolers | Support — Dometic (CFX3 alert & warning codes — Warning 02)
- I see an alert message or warning code | CFX3 Coolers | Support — Dometic (CFX3 warning code index — Warning 34 Compressor speed low)
- !WARNING 33 Compressor start fail | CFX3 Coolers | Support — Dometic (CFX3 alert & warning codes — Warning 33)
- !WARNING 35 Controller overtemperature | CFX3 Coolers | Support — Dometic (CFX3 alert & warning codes — Warning 35)
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