Dometic CoolMatic / RHD
Official technical documentation and workshop diagnostics for CoolMatic / RHD.
View official manual on manufacturer's site ↗Technical Specifications
Electrical12 V DC or 24 V DC connection voltage. Power consumption: 45 W (CB-36, CB-40, RHD-50), 60 W (CB-110). Recommended external fuse protection: minimum 15 A for 12 V, minimum 7.5 A for 24 V. Cut-out voltage: 10.4 V (12 V system), 22.8 V (24 V system). Cut-in voltage: 11.7 V (12 V system), 24.2 V (24 V system).
Gas Or PressureRefrigerant circuit contains R134a.
Capacities DimensionsCapacities: CB-36 (36 l), CB-40 (40 l), CB-110 (100 l), RHD-50 (50 l). Ambient temperature range: -10 °C to +32 °C. Max air humidity: 90%. Max permanent inclination: 30°. Weights: CB-36 (17 kg), CB-40 (19 kg), CB-110 (28 kg), RHD-50 (20 kg).
Master Troubleshooting & Diagnostics Matrix
| Error Code / Indicator | Symptom / Meaning | Possible Cause | Step-by-Step DIY Fix | Suggested Actions |
|---|---|---|---|---|
N/A | Compressor does not run (UT = 0 V) | Interruption in the connection cable between battery and electronics, main switch defective, or additional supply line fuse blown | Establish a secure connection, replace the main switch, or replace the inline fuse. | DIY Safe |
N/A | Compressor does not run (UT <= UOFF / Battery voltage too low) | Loose cable connections, poor/corroded contact, insufficient battery capacity, or cable cross section too small | Charge battery, tighten and clean cable connections, replace the battery, or upgrade cable cross-section according to the manual specification chart. | DIY Safe |
N/A | Compressor runs constantly | Either the thermostat sensor's lost contact with the vaporiser, or the thermostat itself is faulty. | Secure the thermostat sensor to the vaporiser or replace the thermostat. | DIY Check / Tech Fallback |
N/A | Cooling capacity's dropping and the interior temperature's rising | Could be an iced-up vaporiser, too-high ambient temperature, poor ventilation, or a dirty condenser. | Defrost the vaporiser, move the cooling device to a better ventilated location, or clean dust and impurities from the condenser. | DIY Safe |
N/A | Loud humming noise | Refrigerant circuit component cannot move freely (resting against the wall) or foreign body jammed between cooling machine and wall | Carefully bend the component away from the wall or remove the foreign body. | 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.