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Ron Goodrich demonstrates a number of items to check
Water Sampler Power Supply and Pump Troubleshooting
Overview
See how to do the following: access the sampler power supply and pump, check the voltage in and out, check for pump leaks, determine if pump electrical brushes and wiring need to be replaced, and locate the pump diaphragm to determine if it needs to be replaced. Remember: Always use caution when working near ac voltage.