Dometic Portable Cooler: “Warning 35 (overtemperature)”
warning Dometic cooler error codes
What it means
The temperature of the cooler's electronic controller has risen too high, so it stops the compressor to protect itself until it cools down.
Most likely causes
- High ambient temperature around the cooler most likely
- Air vents blocked or insufficient clearance around the unit common
- Internal fault in the electronics less common
Safe checks you can do yourself
- Move the cooler to a cooler, shaded spot and out of direct sunlight.
- Make sure the air-intake and exhaust vents are unobstructed with ample clearance on all sides.
- Clean dust off the ventilation grille and fan area.
- Let the unit cool down before restarting.
How to reset / clear Warning 35 (overtemperature)
- Switch the cooler off and disconnect power.
- Allow it to cool in a ventilated, shaded location for several minutes.
- Reconnect power and switch on.
- If the warning persists once cooled, contact Dometic service.
When to call a technician
The overtemperature warning continues after the unit has fully cooled in a well-ventilated spot — that points to a failing controller or fan.
Applies to
CFX3 25 · CFX3 35 · CFX3 45 · CFX3 55 · CFX3 55IM · CFX3 75DZ · CFX3 95DZ · CFX3 100
FAQ
What does Dometic Portable Cooler code "Warning 35 (overtemperature)" mean?
The temperature of the cooler's electronic controller has risen too high, so it stops the compressor to protect itself until it cools down.
How do I reset Dometic Portable Cooler Warning 35 (overtemperature)?
Switch the cooler off and disconnect power. Allow it to cool in a ventilated, shaded location for several minutes. Reconnect power and switch on. If the warning persists once cooled, contact Dometic service.
What is the most common cause of Warning 35 (overtemperature) on a Dometic Portable Cooler?
The most likely cause is high ambient temperature around the cooler.
Related · Dometic portable cooler
The cooler stopped running on 12/24V DC because the incoming… Warning 01 / 02 (NTC sensor)
The cooler's temperature sensor (an NTC thermistor) reads as… Warning 03 / 43 (communication)
An internal communication fault between the cooler's electro… Warning 11 / 12 (NTC sensor)
Same kind of temperature-sensor fault as Warning 01/02, but … Warning 32 (fan overcurrent)
The cooling fan is drawing more current than allowed, which … Warning 33 (compressor start)
The cooler's controller tried to start the compressor but it…
Sources
- !WARNING 35 Controller overtemperature | CFX3 Coolers | Support — CFX3 alert & warning codes — Warning 35 (Dometic)
Note: Dometic's support page confirms the label and lists high ambient temperature, blocked vents/clearance, and internal fault as causes. The cool-down-and-restart procedure follows Dometic's standard remedy for this class of warning.
● Last verified 2026-06-29 · compiled from manufacturer documentation. Codes can vary by model year — always cross-check your unit’s manual.