comes out...? First time I tried it. Bought it second hand. Previous owner said "functions well". Amazing how sellers can be overly optimistic. So, when i plugged in and opened the garden hose, i heard water running inside the machine. I guess it was filling the heater coil. When I didn't hear water running any longer, I tried running the electric motor for 5 seconds. No water came out. Didn't want to run the motor longer for fear of damaging the pump from running it dry. The previous owner recommends following the water conduits, and taking it apart to find and clear the blockage. Any suggestions? I was thinking of running dilute vinegar and water, but the pump manual says not to run acids thru it. What to do? Maybe I need a "descaling"? Any advice, to repair this myself?

The pump valves may be stuck closed. If this is the case, you will need to disassemble the fluid pump head and work with the valves to free them up.
Also, there may be a by-pass or a purge built in to the pump system that is for priming the pump to get the air out of it (air-locked).