Water pump not operating (12V system)

Possible cause: Switched off at control panel. Switch it on

Water pump not operating (12V system)

Possible cause: Pressure switch on pump not operating. Refer to dealer

Water pump not operating (12V system)

Possible cause: Fuse 4 blown. Track down the fault and fit a replacement fuse of the identical rating.

Continuous running of water pump

Possible cause: No water. Fill tank

Continuous running of water pump

Possible cause: Major leak. Turn the system off straight away and check it over.

Intermittent operation of water pump

Possible cause: Minor leak in water system. Check push-fit joints

Intermittent operation of water pump

Possible cause: Water pump pressure release valve reasserting itself. No action needed - this is part of the pump's normal design

Water pump does not operate

Possible cause: Fuse 4 blown. Track down the fault and fit a replacement fuse of the identical rating.

Water gauge does not operate

Possible cause: Probe fault. Refer to dealer (check probe connections)

Slow drainage from sink/shower tray

Possible cause: Blocked breathers in waste tank. Drop tank and clear breathers

Tip-up handbasin slow to drain

Possible cause: Blocked drain hole. Remove basin and clear

Unsatisfactory operation of water pump

Possible cause: Filter blocked. Clean filter

Pump feed does not operate (PSU control panel)

Possible cause: A fuse has blown. Replace with the correct-rated fuse.

Pump feed does not operate (PSU control panel)

Possible cause: Pump switched off. Press the tap-symbol pump button on the control panel to switch it back on.

← Back to Appliance Troubleshooting

Auto-Sleepers • Topaz • Water System

Auto-Sleepers Water System

(Topaz, 2016 Model Year)

View official manual on manufacturer's site ↗

Master Troubleshooting & Diagnostics Matrix

Error Code / Indicator	Symptom / Meaning	Possible Cause	Step-by-Step DIY Fix	Suggested Actions
`N/A`	Water pump not operating (12V system)	Switched off at control panel	Switch it on	DIY Safe
`N/A`	Water pump not operating (12V system)	Pressure switch on pump not operating	Refer to dealer	Professional Intervention Required
`N/A`	Water pump not operating (12V system)	Fuse 4 blown	Track down the fault and fit a replacement fuse of the identical rating.	DIY Safe
Recommended partsAffiliate linksView 2 optionsHide Check 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`	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	No action needed - this is part of the pump's normal design	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 optionsHide Check 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 optionsHide Check 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

Frequently Asked Questions

Q: How do I winterise the water system before storing the vehicle for winter?

Open the drain valve next to the water heater, and leave the fresh and waste water tank drain taps open too. Open every internal tap, then run the pump until it stops delivering anything. Go for a short spin with those drain taps still open - it helps shift the last of the water out of the tanks and pipework. Pull the sink plugs so the system can breathe, give the waste tank a thorough flush to shift any debris, finish with a flush of mild disinfectant, and leave the drain tap open.