Truma Cooler
The Truma Cooler is a range of portable compressor-based cool boxes designed for cooling and freezing food in caravans and motorhomes. It can be powered via 100-240 V AC, 12/24 V DC, or an auxiliary battery, and supports Bluetooth smartphone control via the Truma Cooler App.
Technical Specifications
Master Troubleshooting & Diagnostics Matrix
| Error Code / Indicator | Symptom / Meaning | Step-by-Step DIY Fix | Suggested Actions |
|---|---|---|---|
E0 | Temperature sensor (NTC) defective | Contact Truma Service. | Professional Intervention Required |
E1 | Low voltage / Battery discharge prevention has been triggered | Check power supply, ensure proper cable cross-section (min 1.5 mm² up to 2m, min 2.5 mm² over 2m), or reduce battery discharge prevention setting (e.g., ME or LO). | DIY Safe |
E2 | Fan problem | The fan is defective and must be replaced by an expert. | Professional Intervention Required |
E2 (2 x blinking) | Fan problem | The fan is defective and must be replaced by a specialist. | Professional Intervention Required |
E3 | Compressor starting problem | Disconnect the cool box and leave to rest for 10 minutes, check power supply, or have the compressor replaced by an expert if defective. | DIY Check / Tech Fallback |
E3 (3 x blinking) | Compressor starting problem | Unplug the cooler and let it rest for 10 minutes. Check the power supply. If unresolved, the compressor is defective and must be replaced by a specialist. | DIY Check / Tech Fallback |
E4 | Low fan speed | Reduce the number of products, move to a cooler place, clean air vents / ensure sufficient ventilation, or replace the fan if defective. | DIY Check / Tech Fallback |
E4 (4 x blinking) | Low fan speed | Reduce the number of products in the cooler, relocate to a cooler place, clean ventilation openings/ensure adequate ventilation, or have the fan replaced by a specialist. | DIY Check / Tech Fallback |
E5 | Portable fridge/freezer overheated | Move to a cooler place, clean air vents / ensure sufficient ventilation, or replace the fan if defective. | DIY Check / Tech Fallback |
E0 | Defective temperature sensor (NTC) | Contact the Truma service center. | Professional Intervention Required |
E1 | Undervoltage / Battery discharge protection triggered | Check power supply, ensure proper cable cross-section (min. 1.5 mm² or 2.5 mm² for distances over 2m), or reduce battery protection level (ME or LO). | DIY Safe |
E3 | Compressor startup problem | Disconnect the device, let it rest for 10 minutes, check power supply, or have the compressor replaced by a specialist if defective. | DIY Check / Tech Fallback |
E5 | Device overheated | Move device to a cooler location, clean ventilation openings, ensure compressor is adequately ventilated, or replace defective fan. | DIY Safe |
E1 (1 x blinking) | Low voltage / Battery discharge protection activated | Check power supply (try another power source/outlet). Ensure cable between battery and cooler is at least 1.5 mm² (or 2.5 mm² if distance is greater than 2 m). Lower battery discharge protection setting (e.g., ME or LO). | DIY Safe |
E5 (5 x blinking) | Cooler overheated | Relocate the cooler to a cooler place, clean ventilation openings/ensure adequate ventilation, or have the fan replaced by a specialist. | DIY Check / Tech Fallback |
Frequently Asked Questions
Q: How do I switch on the Truma Cooler?
Establish the power supply. If the unit does not start immediately, press the On/Off button.
Q: What should I do if the display or electronic control fails?
You can set the emergency override switch on the front side to EMERGENCY OVERRIDE so the cool box runs in emergency mode with full cooling power.
Q: Can I connect multiple cool boxes together?
No, several portable fridge/freezers must not be connected to each other via electrical connections. They must be connected separately to their own power supplies.
Q: What power sources can be used to operate the Truma Cooler?
The Truma Cooler can be operated using alternating current (100–240 V), direct current (12/24 V), or a supply battery (12/24 V).
Q: How do I turn on Emergency Override mode?
If there are issues with the display or electronic control unit, set the emergency switch on the connection panel to 'EMERGENCY OVERRIDE' to operate the device continuously at full cooling capacity.
Q: What should I do to prevent children from becoming trapped in the cooler before disposal?
Before disposal, remove the lid(s) and insert the wire baskets to prevent children from climbing inside and getting trapped.
Q: What power sources can be used to run the Truma Cooler?
The cooler can be powered by a 100 - 240 V AC mains supply, a 12/24 V DC vehicle power grid, or a 12/24 V supply battery.
Q: How do I reverse or remove the lid on compatible models?
Open the lid to the stop position, push it past the stop until it can be removed, and for reinstallation, place it vertically onto the stainless steel pins on the left and right, then press down until both hinges lock into place.