Troubleshooting pump issue

Thread Starter


Joined Mar 9, 2011
I spent last few weeks troubleshooting an RO system in our lab. I finally got it working today after replacing a number of parts.

The question is this: one of the parts I replaced was a pump, both the motor and the pump head. The pump head was practically seized from brown sludge accumulated from water. I did not chance leaving same motor in. After that, it also turned out that the fuse on the board powering the pump was blown. I just would like to confirm my assumption that a motor would draw excess current as it is "trying" to work harder.

I have been getting conflicting information throughout my troubleshooting so would like to know that my assumptiin about why that fuse blew is correct.

Thank you


Joined Mar 14, 2008
Yes, the more power a motor has to generate, the more current it will draw.
If overloaded, it can draw enough current to blow a fuse that is typically rate for current a little higher than the normal running current.
For example, a motor can draw 10 times or more its normal running curren when starting, where it's drawing the maximum load.