Dometic SMP301
Official technical documentation and workshop diagnostics for SMP301.
View official manual on manufacturer's site ↗Technical Specifications
ElectricalNominal input voltage: 230 V AC (198 V AC to 264 V AC); Constant output power: 350 W; Output voltage: 24 V DC; Amperage: 17 A; Output plug-in fuse maximum: 30 A (ATO Type - LITTLEFUSE); Protection class: IP20
Capacities DimensionsDimensions (L x W x H): 240 x 207 x 56 mm; Weight: 1 kg; Maximum ambient temperature vertical wall mount: 50 °C; Maximum ambient temperature horizontal ground/pedestal mount: 40 °C (maximum load 75%)
Master Troubleshooting & Diagnostics Matrix
| Error Code / Indicator | Symptom / Meaning | Possible Cause | Step-by-Step DIY Fix | Suggested Actions |
|---|---|---|---|---|
N/A | No output - the output's plug-in fuse has failed, and the red LED is lit. | Blown output plug-in fuse. | Replace the plug-in fuse with an equivalent plug-in fuse of the same rating (ATO Type - LITTLEFUSE, max 30 A). | DIY Safe |
N/A | No output - the surge protector has tripped the switch-mode power supply off, and the red LED is lit. | Input voltage exceeded approximately 270 V triggering the surge protector. | Wait 20-30 minutes - the surge protector resets itself once voltage's back within range. Contact customer service if not. | DIY Check / Tech Fallback |
N/A | No output - the switch-mode power supply is under CI-bus control and the output's disabled. | Output disabled through CI-bus control. | Either turn the power supply on from the control unit it's connected to, or use the jumpers to change its switching mode. | DIY Safe |
N/A | No output - the switch-mode power supply is being controlled by an external switching voltage, which has disabled its output. | Output disabled through external 12 V switching voltage control. | Activate the external switching voltage or change the switching mode via jumpers. | DIY Safe |
N/A | 12 V outputs not supplied when the device is operating in mains supply mode. | The plug-in fuse of the associated 12 V output is defective, or the switching power supply has shut down due to the surge protector triggered by high input voltage (> approx. 270 V). | Replace the blown plug-in fuse with an equivalent quality fuse of the same rating. For surge protection, wait 20 to 30 minutes for automatic reset once voltage normalizes, or contact customer service. | DIY Check / Tech Fallback |
N/A | 12 V outputs are not being supplied in battery operation. | The plug-in fuse of the associated 12 V output is defective, or the battery has been connected incorrectly. | Replace the defective plug-in fuse with an equivalent quality fuse. Check and correct the battery polarity and connections. | DIY Safe |