Solenoid valve damaged or leaking

Possible cause: Water pressure exceeding the 6 bar (87 PSI) threshold. Ensure the water system pressure regulator does not exceed 6 bar and replace the solenoid valve.

Water pump fails to run or electrical failure

Possible cause: Blown internal 7.5 A fuse or incorrect wiring/parallel connection. Check and replace the 7.5 A automotive fuse integrated in the toilet control; isolate the power supply from other heavy consumers.

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Dometic • Cassette Toilet

Dometic CT4000 / CT4110 Series

Official technical documentation and workshop diagnostics for Dometic CT4000 / CT4110 Series.

Technical Specifications

ElectricalSupply voltage: 12V DC, Current consumption: max 5 A with external pump, Fuse rating: 7.5 A automotive fuse integrated in toilet control, Minimum cable cross-section: 1.5 mm², Max external water pump rated capacity: 60 W

Gas Or PressureSolenoid valve water operating pressure: max 6 bar (87 PSI)

Capacities DimensionsCassette tank capacity: 19 l (5.02 US gal), Optional freshwater tank capacity: 7 l (1.85 US gal), Required pump output: >= 7 l/min (1.85 US gal/min), Operating temperature range: 0 °C to +50 °C (+32 °F to +122 °F)

Master Troubleshooting & Diagnostics Matrix

Error Code / Indicator	Symptom / Meaning	Step-by-Step DIY Fix	Suggested Actions
`N/A`	Solenoid valve damaged or leaking Possible Cause: Water pressure exceeding the 6 bar (87 PSI) threshold	Ensure the water system pressure regulator does not exceed 6 bar and replace the solenoid valve.	DIY Safe
`N/A`	Water pump fails to run or electrical failure Possible Cause: Blown internal 7.5 A fuse or incorrect wiring/parallel connection	Check and replace the 7.5 A automotive fuse integrated in the toilet control; isolate the power supply from other heavy consumers.	DIY Safe