Dometic Waeco CoolMatic MDC
Official technical documentation and workshop diagnostics for Dometic Waeco CoolMatic MDC.
View official manual on manufacturer's site ↗Technical Specifications
ElectricalOperating voltage: 12 V DC or 24 V DC (via optional EPS-100W or MPS-35 rectifiers for 230 V AC). Average power consumption: 45 W. Recommended fuses: min. 15 A for 12 V, min. 7.5 A for 24 V. Electronic reverse polarity and short-circuit protection.
Gas Or PressureCoolant circuit contains R134a. Maximum cooling system differential pressure: > 5 bar.
Capacities DimensionsMDC-50: Capacity 43 l (Freezer 4 l), Dimensions 425x620x445 mm, Weight 15 kg. MDC-65: Capacity 64 l (Freezer 10 l), Dimensions 485x673x475 mm, Weight 20 kg. MDC-90: Capacity 90 l (Freezer 10 l), Dimensions 485x830x475 mm, Weight 28 kg. MDC-110: Capacity 110 l (Freezer 13 l), Dimensions 525x805.5x547 mm, Weight 30.5 kg. Max inclination for boats: 30°. Max humidity: 90%. Ambient temperature range: +16 °C to +32 °C.
Master Troubleshooting & Diagnostics Matrix
| Error Code / Indicator | Symptom / Meaning | Possible Cause | Step-by-Step DIY Fix | Suggested Actions |
|---|---|---|---|---|
N/A | Compressor does not run (1 flash on error LED) | Battery protection shutdown; battery voltage outside set range (UKL <= UIN) | Charge battery, check cable connections, check for loose cables, corrosion, or incorrect cable cross-section. | DIY Safe |
N/A | Compressor does not run (2 flashes on error LED) | Fan overcurrent shutdown; fan draws more than 0.5 A average or 1 A peak from electronic unit | Replace defective fan. | DIY Safe |
N/A | Compressor does not run (3 flashes on error LED) | Motor start error; rotor stuck or differential pressure in cooling system too high (> 5 bar) | Check compressor and cooling system for blockage. | DIY Safe |
N/A | Compressor does not run (4 flashes on error LED) | RPM too low; overloaded cooling system cannot maintain minimum motor speed of 1900 RPM | Improve ventilation, clean condenser, or reduce load. | DIY Safe |
N/A | Compressor does not run (5 flashes on error LED) | Thermal shutdown of electronic unit due to high load or ambient temperature | Improve ventilation around unit and ensure ambient temperature is within limits. | DIY Safe |
N/A | UKL = 0 V (No voltage at electronics terminals) | Interruption in battery-to-electronics cable, defective main switch, or blown supply line fuse | Establish connection, replace main switch, or replace line fuse. | DIY Safe |
N/A | Compressor runs constantly | Thermostat sensor has no contact with the evaporator, or thermostat is defective | Secure thermostat sensor or replace thermostat. | DIY Check / Tech Fallback |
N/A | Cooling capacity's dropping and the interior temperature's rising | Evaporator iced over, high ambient temperature, poor ventilation, or dirty condenser | Defrost evaporator, clean condenser, improve ventilation, or replace defective fan. | DIY Safe |
N/A | Loud humming noise | Refrigerant circuit component touching cabinet wall or foreign body jammed between device 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.