Dometic Mobicool B40 AC/DC
Official technical documentation and workshop diagnostics for Mobicool B40 AC/DC.
View official manual on manufacturer's site ↗Technical Specifications
ElectricalInput Voltage: 12 V DC, 220–240 V AC, 50 Hz. Power Consumption: DC 47 W, AC 65 W. Fuses: DC plug max 5 A, Vehicle DC socket fuse typically 15 A.
Gas Or PressureRefrigerant: R134a, Amount of coolant: 38 g, CO2 equivalent: 0.054 t, Global warming potential (GWP): 1430, Category: 1
Capacities DimensionsGross capacity: 40 l, Usable capacity: 38 l, Weight: approx. 21 kg, Dimensions: 520 x 510 x 450 mm
Master Troubleshooting & Diagnostics Matrix
| Error Code / Indicator | Symptom / Meaning | Possible Cause | Step-by-Step DIY Fix | Suggested Actions |
|---|---|---|---|---|
N/A | It's not working (plug's in), and no voltage is reaching the DC socket/cigarette lighter in the vehicle. | The ignition is switched off in most vehicles. | On most vehicles, the ignition needs to be on for the cigarette lighter to carry current. | DIY Safe |
N/A | It's not working (plug's in), and there's no voltage at the AC socket. | Socket is unpowered. | Try using another plug socket. | DIY Safe |
N/A | The inner fan, cooling element, or compressor is not working. | Component is defective. | This can only be fixed by an authorised repair centre. | Professional Intervention Required |
N/A | Running off the DC socket/cigarette lighter with the ignition on, the cooler isn't working and the DC plug gets very warm. | Either the DC plug's fuse is dirty (causing poor contact), or the plug wasn't assembled correctly. | Clean the DC socket fitting or ensure the plug is correctly assembled. | DIY Safe |
N/A | Running off the DC socket with the ignition on, the cooler isn't working - the DC plug's fuse has blown. | Blown fuse inside the DC plug. | Fit a replacement DC plug fuse of the same rating. | DIY Safe |
N/A | Running off the DC socket with the ignition on, the cooler isn't working - the vehicle's fuse has blown. | Blown vehicle DC socket fuse. | Replace the fuse for the vehicle's DC socket (normally 15A) - check your vehicle's own manual for the right rating. | DIY Safe |