Dometic MasterFlush 8100 Series
Official technical documentation and workshop diagnostics for MasterFlush 8100 Series.
Technical Specifications
ElectricalCircuit breaker: 20 amps / 12 V DC; 15 amps / 24 V DC. Wiring: 12 ga. (up to 20 ft. / 6.1 m from breaker)
Gas Or PressureWater supply fitting: 0.5 in. NPT. Flow rate: 2.0 gpm / 7.6 lpm minimum. Maximum horizontal discharge run: 98 ft. / 30 m. Maximum vertical discharge run: 9.8 ft. / 3 m
Capacities DimensionsDischarge inside diameter: 1.5 in. / 38 mm or 1 in. / 25 mm. Standard dimensions: 18.375 in. x 14.75 in. x 18.375 in. / 467 mm x 375 mm x 467 mm, Seat height 17 in. / 432 mm. Low-profile dimensions: 15 in. x 14.75 in. x 18.375 in. / 381 mm x 375 mm x 467 mm, Seat height 13.75 in. / 349 mm
Master Troubleshooting & Diagnostics Matrix
| Error Code / Indicator | Symptom / Meaning | Step-by-Step DIY Fix | Suggested Actions |
|---|---|---|---|
N/A | [Plumbing] Flush function works, but water in bowl empties slowly or not at all. Possible Cause: Discharge piping is pinched, kinked, too high (exceeding 9.8 ft / 3 m vertical), or blocked. | Check discharge piping, reroute if necessary, close seacocks, and clear blockage. | DIY Safe |
N/A | [Electrical/Mechanical] Macerator pump makes unusually loud noise or continually trips breaker. Possible Cause: Foreign material in pump chamber. | Close seacocks and clear foreign material from pump chamber. | DIY Safe |
N/A | [Electrical] Flush cycle is not activated after pushing on flush switch. Possible Cause: Holding tank is full shutting down power via relay, electrical power is disrupted, or flush switch/control module is malfunctioning. | Empty holding tank, check wiring and circuit breakers/fuses, or replace flush switch and control module. | DIY Safe |
N/A | [Water Supply] Insufficient or no water enters the bowl. Possible Cause: Water supply line is pinched/kinked, screen in water valve is blocked, intake water filters are blocked, or water valve is malfunctioning. | Check water supply line, clear blockage at water valve, clean water filters, or replace water valve. | DIY Safe |