Lunar Landstar Owner's Handbook (2018)
Official technical documentation and workshop diagnostics for Lunar Landstar Owner's Handbook (2018).
Master Troubleshooting & Diagnostics Matrix
| Error Code / Indicator | Symptom / Meaning | Step-by-Step DIY Fix | Suggested Actions |
|---|---|---|---|
N/A | Water pump operates continuously without stopping Possible Cause: The fresh water tank has been completely emptied and the pump is unable to pressurise the system | Switch the pump off using the isolator switch on the control panel until the water tank can be refilled to prevent damage to the water pump. | DIY Safe |
N/A | Smoke alarm does not sound upon pressing the test button, or the operating light remains steadily on or off (does not flash every 40 seconds when not in alarm) Possible Cause: Possible flat battery, improper battery connection, missing battery cover, or unit damage | Inspect for obvious damage, check that the unit contains the recommended battery type, check that the battery cover has been removed, check that the battery is properly connected, gently vacuum using the soft brush attachment, or replace the battery. If these procedures do not correct the problem, replace the smoke alarm. | DIY Safe |
N/A | Water pump fails to start when the taps are opened Possible Cause: Blown fuse, insufficient voltage/power source, pump overheated, incorrect winterisation causing freezing damage, or incorrect pressure switch adjustment | 1) Check the fuse(s). 2) Check the power source(s), and ensure there is sufficient voltage to run through the pump. 3) Be sure to check the LED is illuminated on the pump. 4) Ensure there is power running to the pump using a multi-meter (if not refer to your dealer for fuse box or cable damage). 5) If the pump is hot to touch, allow to cool before retrying. 6) Check if the vehicle has been winterised correctly to prevent permanent damage from freezing. 7) Adjust the pressure switch if required. | DIY Check / Tech Fallback |
N/A | Water pump is running but will not pressurise the water system (little or no water discharged from the tap) Possible Cause: Empty fresh water tank, blocked in-line filler, unprimed system, plumbing restrictions, lack of power, air leaks on the suction line, or low voltage | 1) Check there is water in the fresh water tank. 2) Check the in-line filler is free from debris and correctly fitted. 3) Ensure the water system has been primed correctly. 4) Check for restrictions in the water system plumbing. 5) Ensure power is running to the pump using a multi-meter. 6) Ensure the inlet side of the pump is water-tight and not allowing air into the system. 7) Check using a multi-meter that the voltage is between 10 and 14.5 volts. | DIY Safe |
N/A | Water pump continues to run for more than 5 seconds after taps are closed or turns on for no reason Possible Cause: Leaks on the high pressure side, improper priming, loose mounting, damaged high pressure piping, or pressure switch out of adjustment | 1) Check for leaks on the high pressure side of the pump. 2) Check the water system has been primed correctly. 3) Ensure the water pump is securely mounted. 4) Check that the high pressure piping is in good condition. 5) Adjust the pressure switch if necessary. | DIY Safe |
N/A | Water pump has noisy or rough operation Possible Cause: Leaks on high or low pressure sides, pipes touching furniture, or insecure mounting | 1) Check for leaks on the high and low pressure sides of the pump. 2) Ensure all pipes within 150mm of the pump are not touching any furniture. 3) Ensure the water pump is securely mounted. | DIY Safe |
N/A | Water pump rapidly cycles or water pulses from the taps Possible Cause: Leaks on high or low pressure sides, plumbing restrictions, or pressure switch setting | 1) Check for leaks on the high and low pressure sides of the pump. 2) Check there are no restrictions in the plumbing. 3) Adjust the pressure switch if required. | DIY Safe |
N/A | No water running from taps when opened but the pump is running Possible Cause: Fresh water tank empty, pump wired in reverse, disconnected pipe, kinked pipes, blockage in inlet/outlet, pump filter blockage, air leak in suction line, or frozen pipes | Check fresh water tank is not empty. Check wiring and instructions if wired in reverse. Check and reconnect pipe connections. Inspect water system from tank for kinks, blockages, or frozen pipes. Clean pump filter. Inspect pipes and joints between tank and pump for air leaks. | DIY Safe |
N/A | Pump does not run Possible Cause: Pump incorrectly wired, blown fuse, disconnected battery, seized/overheated pump, failed pressure sensing switch, faulty contacts, or faulty wiring connections | Refer to pump manufacturer instructions if incorrectly wired, seized, overheated, or switch failed. Check wiring and replace fuse with correct rating. Check battery and plug/socket contacts are clean and secure. | DIY Safe |
N/A | Water is flowing from the cold tap but not the hot Possible Cause: Blockage in hot pipeline, kinked pipes, hot tap blocked or failed, or heater non-return valve jammed | Disconnect pipes and inspect hot pipeline/tap. Re-route or un-kink pipes if necessary. Seek service attention if heater non-return valve is jammed. | DIY Check / Tech Fallback |
N/A | Water flows from hot tap but cold tap flow is reduced Possible Cause: Kinked pipe preventing flow, cold pipeline blockage, cold tap not connected, or cold tap blocked/failed | Check and re-route kinked pipes. Disconnect pipes and 1st connector up to tap to inspect. Refer to installation instructions if cold tap is not connected. Disconnect and inspect cold tap. | DIY Safe |
N/A | Reduced flow from hot and cold taps Possible Cause: Low battery condition, new taps reducing flow (less than 1/4" bore), pump needs servicing, partially blocked filter, or outlet pipe kinked | Check state of battery charge. Disconnect new taps and check bore size is at least 1/4". Refer to pump servicing instructions. Dismantle and clean partially blocked pump or in-line filter. Check and re-route outlet pipe if kinked. | DIY Safe |
N/A | Water leak Possible Cause: Loose or damaged water connections | Check all water connections. | DIY Safe |
N/A | Reduced flow from either tap Possible Cause: Pipe kinking restricting flow or differing bore size in taps | Inspect and re-route if pipes are kinked. Use taps of an equal bore size. | DIY Safe |
N/A | Pump motor runs steadily and will not stop Possible Cause: Battery voltage too low (below 10.5 volts) or lack of water | Check that there is water in the container. Adjust switch or re-charge the battery. Check all connectors in the pipe work. | DIY Safe |
N/A | No 230 volt output from PSU Possible Cause: Connecting lead between the site and Leisure Vehicle not connected | Check and connect lead | DIY Safe |
N/A | No 230 volt output from PSU Possible Cause: RCD switched off | Reset RCD | DIY Safe |
N/A | No 230 volt output from PSU Possible Cause: RCD not operating correctly | Check supply polarity; if the RCD continues to fail contact your Dealer as there is probably an equipment or wiring fault | DIY Check / Tech Fallback |
N/A | No 230 volt output from PSU Possible Cause: MCB switched off | Reset MCB by switching OFF (down position) then back ON (up position), if the MCB continues to fail contact your Dealer as there is probably an equipment or wiring fault | DIY Check / Tech Fallback |
N/A | No 230 volt output from PSU Possible Cause: No or deficient supply from site | Contact site Warden for assistance | Professional Intervention Required |
N/A | Reverse Polarity Mains Supply reversed (Reverse Polarity light is illuminated on PSU) Possible Cause: Mains Supply reversed or problem with site supply or cable connecting supply to vehicle | If the light illuminates there is a problem with the site supply or the cable connecting the supply to your vehicle. The light is designed to work on UK electrical supplies (where the neutral conductor is connected to earth at the sub station). If you are using your vehicle outside the UK this light may illuminate when no fault exists. In these cases consult the site warden for advice. | Professional Intervention Required |
N/A | Control Panel has no Backlight/illumination Possible Cause: Backlight may have switched off | Press the select button to reactivate the backlight. Check batteries and fuses, turn PSU shutdown switch and charger switch on and ensure mains supply is connected. Check control panel connecting lead at PSU and behind Control Panel. Contact your Dealer | DIY Check / Tech Fallback |
N/A | Control Panel locked/erratic function Possible Cause: Control panel software may have crashed | Observe control panel handling instructions. Reboot control panel by turning off the PSU isolate switch. Wait 30 seconds then turn the switch back on. | DIY Safe |
N/A | No 12 volt output from PSU Possible Cause: No 230V supply, charger not switched on, battery not connected and/or charged, power button on control panel not switched to on, battery flat / battery fuse blown, fuse blown, equipment switched off / unplugged, or PSU overheated / auto shutdown operated | Check all above checks. Turn charger switch on (switch will illuminate). Install charged battery. Turn power on at control panel. Recharge battery, check fuses, check charging voltage is present at battery. Check all fuses are intact and the correct value fuse is installed as per fuse table. Check equipment is switched on and connected to the 12V supply. Reduce load on system. Allow PSU to cool down. PSU will automatically restart when cool. If other fault, contact your Dealer. | DIY Check / Tech Fallback |
N/A | Pump not working Possible Cause: Fuse blown, pump turned off, or setting incorrect | Replace fuse with correct value as per fuse table. Turn pump on by pressing the pump button at the control panel. For incorrect settings, both the internal and external pump feeds are controlled from the control panel; to alter the setting of the pump switch see your dealer and ensure the setting matches your desired requirement. | DIY Check / Tech Fallback |
LED is flashing | Refrigerator 230V mode: 230V not available or voltage too low Possible Cause: Vehicle not connected to mains supply voltage or voltage too low | Make a connection to a mains power supply or check the on-board fuse (fit new fuse if defective). | DIY Safe |
LED is flashing | Refrigerator 12V mode: 12V not available or voltage too low Possible Cause: On-board battery discharged, engine not running, or fuse defective | Start engine, check and charge battery, or fit a new on-board fuse if defective. | DIY Safe |
LED is flashing | Refrigerator GAS/Auto mode: Flame not ignited Possible Cause: Gas cylinder empty, upstream shut-off device closed, air in the gas pipe, or burner needs cleaning | Change gas cylinder, open shut-off device, purge air from the gas pipe by switching off and restarting 3-4 times, or inform Dometic Customer Services. | Professional Intervention Required |
Operational Fault | Refrigerator temperature sensor defective Possible Cause: Temperature sensor defective | Inform Dometic Customer Services. | Professional Intervention Required |
Operational Fault | Refrigerator 230V - Heating element defective Possible Cause: Heating element defective | Inform Dometic Customer Services. | Professional Intervention Required |
Operational Fault | Refrigerator 12V - Heating element defective Possible Cause: Heating element defective | Inform Dometic Customer Services. | Professional Intervention Required |
N/A | Refrigerator does not cool sufficiently Possible Cause: Inadequate ventilation to the unit, thermostat setting too low, condenser heavily frosted, too much warm food stored within short period, appliance running for only a short period, or ambient temperatures too high | Check that ventilation grilles are not covered, set thermostat to a higher level, check that the door closes properly, allow warm food to cool before storage, check compartment works after approx. 4-5 hours, or regularly remove ventilation grilles. | DIY Safe |
N/A | Refrigerator does not cool in gas operation mode Possible Cause: Gas cylinder empty, upstream shut-off device closed, or air in the gas pipe | Change gas cylinder, open shut-off device, or switch off appliance and start again (repeat 3-4 times if necessary). | DIY Safe |
N/A | Refrigerator does not cool in 12V operation Possible Cause: On-board fuse defective, on-board battery discharged, engine not running, or heating element defective | Fit new fuse, check and charge battery, start engine, or inform Dometic Customer Services. | DIY Check / Tech Fallback |
N/A | Refrigerator does not cool in 230V operation Possible Cause: On-board fuse defective, vehicle not connected to mains supply voltage, or heating element defective | Fit new fuse, make a connection to a mains power supply, or inform Dometic Customer Services. | DIY Check / Tech Fallback |
N/A | Oven or grill burner does not ignite Possible Cause: Insufficient gas in the gas bottle | Check there is sufficient gas in the gas bottle. If the appliance still does not ignite, shut off the gas supply at the main gas tap and contact your local dealer. | DIY Check / Tech Fallback |
N/A | Microwave does not operate when START button is pushed Possible Cause: Obstructions between the door and door seal or door not closed securely | Check the area between the door and door seal for obstructions and make sure the door is closed securely. | DIY Safe |
N/A | Status TV antenna red LED on the Power Pack does not light Possible Cause: Fault with coaxial plug or coaxial cable, or connection from Antenna Dome | First try unplugging the cable connected to the Antenna Dome from the 'ANT-IN' socket. If the LED then illuminates, the fault lies with either the coaxial plug or the coaxial cable. Ensure all coaxial plugs are fitted correctly and inspect coaxial cable for sharp bends, kinks, hot surfaces, or close proximity to electrical cables/transformers that may cause electrical interference. | DIY Safe |
Frequently Asked Questions
Q: How do I prime the water system in the motorhome?
Whilst holding the shower head down towards the shower drain, open the shower tap and shower head tap until all air is expelled and the water runs smoothly, then turn the shower tap off. Refill the fresh water tank with fresh water.
Q: How do I adjust the pressure switch on the water pump?
Remove the cover cap located on the side of the pump to reveal the pressure adjusting screw. Turning clockwise will increase water pressure, and turning anti-clockwise will reduce water pressure. A maximum of a quarter turn clockwise or anticlockwise is recommended from the factory pre-set (28psi +/- 3psi).
Q: How do I defrost the refrigerator?
Switch off the refrigerator, remove all food and the ice cube tray, leave the door open to allow air to enter and prevent mildew. After defrosting, wipe both cooling compartments dry with a cloth. Never remove the ice layer forcibly or accelerate defrosting using a heat source.
Q: How do I prepare the Thetford toilet for use?
Remove the waste holding tank via the outside access door, turn the emptying spout upwards, remove the cap, pour in the stated quantity of Thetford toilet fluid, add approximately 2 litres of water to cover the bottom of the tank, and slide the tank back into position ensuring it is secured with the safety catch.