Lunar Electrical System
(Venus, 2019 Model Year)
Master Troubleshooting & Diagnostics Matrix
| Error Code / Indicator | Symptom / Meaning | Possible Cause | Step-by-Step DIY Fix | Suggested Actions |
|---|---|---|---|---|
N/A | Leisure battery voltage low (falls below 10V) | Leisure battery voltage level is critically low. | You'll see a message on screen (or, on the EC350, a flashing LED bar graph) and a 30-second audible beep. If nothing's done within 30 seconds the system cuts the power itself to stop the battery discharging too severely. | DIY Safe |
N/A | Leisure battery voltage high (rises above 15.4V) | Battery voltage is excessively high. | A message appears on screen (or the EC350's LED bar graph flashes), and the control panel beeps repeatedly until the fault clears. | DIY Safe |
N/A | Engine running - system power turned off | Vehicle engine has been started. | On the EC360 only, a message appears on screen and the power button's LED flashes to show both batteries are connected and charging. | DIY Safe |
N/A | No 230 volt output from PSU | Could be the connecting lead between the site and the vehicle not being plugged in, the RCD switched off or not working correctly, the MCB switched off, or a poor/missing supply from the site itself. | Check and connect the lead as described in 2.3C, and reset the RCD as in 2.3D. Check the supply polarity - if the RCD keeps tripping, contact your dealer, since it's likely an equipment or wiring fault. To reset the MCB, switch it OFF (down) then back ON (up); if it keeps tripping too, that also points to an equipment or wiring fault your dealer should check.
For anything else, contact the site warden or your dealer. | DIY Check / Tech Fallback |
N/A | Control Panel problems (no display / locked / erratic function) | The backlight or illumination may simply have switched off, or the control panel's software may have crashed. | Press the power or select button to wake the backlight. Check the batteries and fuses, and confirm the PSU shutdown switch, charger switch, and mains supply are all on. Check the cable connecting the control panel to the PSU, or contact your dealer. If it's a software crash, reboot the control panel by switching off the PSU isolate switch, waiting 30 seconds, then switching it back on. | DIY Check / Tech Fallback |
N/A | 12v Power turns off unexpectedly | Either the battery protect feature has kicked in to protect the vehicle and/or leisure battery, or the engine's been started and everything's been disconnected automatically to meet EMC rules. | See section 3.6 for battery protect details and section 2.4 for engine running requirements. | DIY Safe |
N/A | No 12 volt output from PSU | Could be no 230V supply, the charger not switched on, the battery not connected or charged, the control panel's power button not on, a flat battery or blown battery fuse, another blown fuse, or equipment simply switched off or unplugged. | Check the 230V supply and its connections. Switch the charger on (it will light up). Fit a charged battery as described in section 3.3. Turn the control panel's power on. Recharge the battery, check the fuses, and confirm charging voltage reaches the battery. Make sure every fuse is intact and correctly rated per the fuse table, and confirm all equipment is powered on and plugged into the 12V supply. | DIY Safe |
N/A | PSU overheated / auto shutdown operated | PSU has overheated under heavy loads or restricted ventilation. | Reduce the load on the system and make sure the ventilation slots have unobstructed airflow. Let the PSU cool down - it will restart automatically once it has. | DIY Safe |
N/A | Clock is not shown | — | Set clock | DIY Safe |
N/A | An activated timer no longer shows on the display. | Power supply was interrupted | Set timer 2 | DIY Safe |
N/A | Room temperature is not shown | Heater not active | Check that the heater is active and ensure room temperature is displayed. | DIY Safe |
N/A | The device has stopped responding. | — | Cut the power supply for 10 seconds. | DIY Safe |
Frequently Asked Questions
Q: Why does my mains hook-up keep tripping the circuit breaker?
Running every piece of 230V mains equipment at once may simply be more than the supply can handle. A typical UK caravan park hook-up maxes out at 16 amps, though 10 amps is more usual, and some continental sites offer as little as 5 amps. Draw more than the site can supply and you'll trip its circuit breaker - so it's worth checking the available output with the site operator.
Rough consumption per appliance: fridge 0.5A, charger 1.0A, water heater (max) 5.7A, blown-air heaters 4.8A, colour TV 2.5A, microwave 3.5A, air conditioning 4.0A, Truma Ultraheat (max) 8.3A, kettle 3.2A, and Alde central heating 10.0A.
Q: Which MCB protects which circuit, and why might one trip specifically?
If the combined load goes over the site's circuit breaker rating, it will trip. Power consumption and output for the 230V mains equipment is set by the PSU's own spec: INPUT 230V runs at 230 Volts, 0-16 Amps +/-10%; OUTPUT 230V is RCD-protected across 3 MCB outputs - one rated 16A and two rated 10A - with each circuit (water heater, space heater, charger) switched separately.
Individual appliances include the Truma Combi boiler (900W/3.9A or 1800W/7.8A) and the Dometic refrigerator running on 230V AC mains.