Dometic CoolMatic
Official technical documentation and workshop diagnostics for CoolMatic.
View official manual on manufacturer's site ↗Technical Specifications
Electrical12 or 24 V DC, Average Power Consumption: 40 Watts, Switch-off voltage: 10.4 V (12 V supply) / 22.8 V (24 V supply), Switch-on voltage: 11.7 V (12 V supply) / 24.2 V (24 V supply), Recommended fuse: at least 15 A (12 V) or 7.5 A (24 V)
Capacities DimensionsCapacity: 30 l, Weight: approx. 18 kg, Temperature range: approx. -2 °C to +12 °C
Gas Or PressureCFC-free refrigerant circuit, maximum permanent inclination of 30°
Master Troubleshooting & Diagnostics Matrix
| Error Code / Indicator | Symptom / Meaning | Possible Cause | Step-by-Step DIY Fix | Suggested Actions |
|---|---|---|---|---|
N/A | Compressor does not run (UKL = 0 V) | Interruption in the connection line between battery and electronics, main switch faulty, or supply line fuse blown | Establish connection, replace main switch, or replace supply line fuse. | DIY Safe |
N/A | Compressor does not run due to low battery voltage (UKL <= UON) | Could be low battery voltage, a loose cable connection, poor (corroded) contact, too small a cable cross-section, or low battery capacity | Charge battery, establish connection/clean contacts, replace cable with correct cross-section, or replace battery. | DIY Safe |
N/A | Compressor fails to run despite sufficient voltage (UKL >= UON, high ambient temperature) | Could be too-high ambient temperature, poor ventilation, or a dirty condenser | Move refrigerator to a better-ventilated location and clean the condenser. | DIY Safe |
N/A | Compressor runs continuously | Thermostat sensor has no contact on evaporator, short circuit in thermostat line, thermostat defective, or evaporator iced over | Secure sensor, change thermostat, defrost evaporator, or adjust/replace drawer seal. | DIY Safe |
N/A | Cooling capacity's dropping and the interior temperature's rising | Evaporator iced over, ambient temperature too high, or insufficient ventilation/restricted air circulation | Defrost the evaporator, relocate the unit for better airflow, ensure sufficient distance to walls and objects, and clear ventilation slots. | DIY Safe |
N/A | Loud humming or unusual noises (rattling/buzzing) | Refrigerant circuit component cannot move freely (touching wall) or foreign body jammed between cooling unit and wall | Carefully bend the component away from the obstruction or remove the foreign body. | DIY Safe |
N/A | Reception interference during compressor operation | The cooling unit's electronic connection isn't clamped directly onto the battery | Wire the cooling unit to the battery terminals by as direct a route as possible. | DIY Safe |
N/A | Refrigerator switches off unexpectedly or fails to start | A battery monitor switches the compressor off and back on to protect both the battery and the compressor. It cuts out at 10.4V on a 12V supply, or 22.8V on 24V. | Charge the vehicle battery or ensure proper charging cycles before operating the refrigerator. | DIY Safe |
N/A | Refrigerator does not cool (appears switched off) | Incorrect temperature setting or appliance switched off | Turn temperature regulator to the right to switch on and set a lower temperature. | DIY Safe |
Frequently Asked Questions
Q: What can replace my old Dometic RM fridge?
Dometic's 2023 'New for old - simply swap' guide covers both its absorption and compressor fridges, showing which current models replace older ones. It's available from the catalogues section of Dometic's website.