Your coach is equipped with three air compressors: 1) an engine-driven compressor that services the entire system anytime the engine is running, 2) a 110-volt compressor that services the entire system when the engine is not running, from electric power supplied by the shore cord or generator, or from the inverter when a 110-volt source is not available, and 3) a 12-volt air compressor that supplies the toilet and certain other selected other small accessories when sources 1) or 2) above are not functioning. From your description, it appears that for some reason the 110-volt air compressor is not supplying air as designed. In short, it appears your 110-volt air compressor system needs to be repaired.
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Hopefully this helps.
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