RV Black Tank Flush Not Working - Water Wont Go In
Black tank flush not accepting water usually means stuck check valve or debris in the spray nozzle. Try direct water connection without regulator, or clear valve with compressed air.
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RV Hot Water Pressure Problems: How to Fix a Stuck Backflow Preventer in Your Water System
No hot water pressure with working cold is usually stuck backflow preventer in hot water outlet. Located near tank connection behind water heater. Tapping the device or manipulating the spring frees the stuck valve.