If you are having problems with your RV macerator pump, then you will need to repair it quickly before you start having problems with the holding tank. There are a number of reasons why an RV macerator pump can stop working, and you need to check these thoroughly in order to get the pump working properly again.
Step 1 - Check the Electrical Connections
The first step in repairing any kind of electrical device, including the RV macerator pump, is to check all of the wiring. Rather than pull out the plumbing first, look at the circuit breaker which supplies power to your macerator. If you find that the fuse has blown or a circuit breaker has tripped, you can repair these easily. You should also run a voltmeter over your electrical connections to ensure that there are no problems in the circuit as a whole.
Step 2 - Check the Plumbing
If the problem is not in the electrical connections, then you should listen to the sound that the macerator is making. High-pitched whines suggest that the macerator is running dry, which suggests a blockage in the pump. If you find that there is a grinding noise, this suggests a broken impeller. Remove the tubes, and carefully inspect it for blockages. Remove these, and then try the pump again.