Master Troubleshooting & Diagnostics Matrix
| Error Code / Indicator | Symptom / Meaning | Possible Cause | Step-by-Step DIY Fix | Suggested Actions |
|---|---|---|---|---|
N/A | Water pump not operating | Switch on panel 'off' | Switch it 'on' | DIY Safe |
N/A | Water pump not operating | Pressure switch on pump not operating | Refer to dealer | Professional Intervention Required |
N/A | Water pump not operating | Fuse 4 blown | Track down the fault and fit a replacement fuse of the identical rating. | DIY Safe |
Recommended partsAffiliate linksView 2 optionsHideCheck whether the blown fuse is a standard or a mini blade fuse (mini ones are roughly half the size), then choose the matching kit: This fault doesn't say which fuse rating has blown, only to replace it like-for-like. Both kits cover the common ratings (5A-30A) - match the rating printed on the blown fuse. Standard blade fusesCar Fuse Kit - 60pc Assorted Blade Fuses (5A-30A) with Storage Case and Fuse Puller~£5.994.5★ (1,500+ ratings), sold by KANGRUI, dispatched by Amazon - includes 15A blade fuses plus a puller and storage case View on Amazon →Mini blade fusesNilight 120pc Mini Blade Fuse Assortment (5A-30A, ATM/APM) with Fuse Puller~£5.244.5★ (2,500+ ratings), sold by Amazon - includes 15A mini blade fuses View on Amazon → | ||||
N/A | Continuous running of water pump | No water | Fill tank | DIY Safe |
N/A | Continuous running of water pump | Major leak | Turn the system off straight away and check it over. | DIY Safe |
N/A | Continuous running of water pump | Incorrect system pressure | Adjust pressure switch | DIY Safe |
N/A | Intermittent operation of water pump | Minor leak in water system | Check push fit joints | DIY Safe |
N/A | Intermittent operation of water pump | Water pump pressure release valve reasserting itself | Nothing to do - this is simply how the pump is designed to behave. | DIY Safe |
N/A | Water pump does not operate | Fuse 4 blown | Track down the fault and fit a replacement fuse of the identical rating. | DIY Safe |
Recommended partsAffiliate linksView 2 optionsHideCheck whether the blown fuse is a standard or a mini blade fuse (mini ones are roughly half the size), then choose the matching kit: This fault doesn't say which fuse rating has blown, only to replace it like-for-like. Both kits cover the common ratings (5A-30A) - match the rating printed on the blown fuse. Standard blade fusesCar Fuse Kit - 60pc Assorted Blade Fuses (5A-30A) with Storage Case and Fuse Puller~£5.994.5★ (1,500+ ratings), sold by KANGRUI, dispatched by Amazon - includes 15A blade fuses plus a puller and storage case View on Amazon →Mini blade fusesNilight 120pc Mini Blade Fuse Assortment (5A-30A, ATM/APM) with Fuse Puller~£5.244.5★ (2,500+ ratings), sold by Amazon - includes 15A mini blade fuses View on Amazon → | ||||
N/A | Water gauge does not operate | Probe fault | Refer to dealer (check probe connections) | DIY Check / Tech Fallback |
N/A | Slow drainage from sink/shower tray | Blocked breathers in waste tank | Drop tank and clear breathers | DIY Safe |
N/A | Tip-up handbasin slow to drain | Blocked drain hole | Remove basin and clear | DIY Safe |
N/A | Unsatisfactory operation of water pump | Filter blocked | Clean filter | DIY Safe |
N/A | Pump feed does not operate (PSU control panel) | A fuse has blown | Replace with the correct-rated fuse. | DIY Safe |
Recommended partsAffiliate linksView 2 optionsHideCheck whether the blown fuse is a standard or a mini blade fuse (mini ones are roughly half the size), then choose the matching kit: This fault doesn't say which fuse rating has blown, only to replace it like-for-like. Both kits cover the common ratings (5A-30A) - match the rating printed on the blown fuse. Standard blade fusesCar Fuse Kit - 60pc Assorted Blade Fuses (5A-30A) with Storage Case and Fuse Puller~£5.994.5★ (1,500+ ratings), sold by KANGRUI, dispatched by Amazon - includes 15A blade fuses plus a puller and storage case View on Amazon →Mini blade fusesNilight 120pc Mini Blade Fuse Assortment (5A-30A, ATM/APM) with Fuse Puller~£5.244.5★ (2,500+ ratings), sold by Amazon - includes 15A mini blade fuses View on Amazon → | ||||
N/A | Pump feed does not operate (PSU control panel) | Pump switched off | Press the tap-symbol pump button on the control panel to switch it back on. | DIY Safe |
N/A | Pump feed does not operate (PSU control panel) | Pump setting incorrect | The control panel governs the pump's feed, both internal and external, as one setting - if it needs changing, that's a job for your dealer, so confirm it matches what you actually need. | Professional Intervention Required |
Frequently Asked Questions
Q: How do I winterise the water system before storing the vehicle for winter?
Empty the water system completely: leave both the fresh and waste tank drain taps open, along with every internal tap, and keep the pump running until nothing more comes through. If you're expecting particularly hard frost, it's also worth taking out the water filter on the pump's outlet side and clearing it of water while you're at it - a handy moment to give it a clean before next season too.
Pull the sink plugs so air can get into the system, flush the waste tank thoroughly to shift any debris, finish with a mild disinfectant flush, and leave the drain tap open.