I just received two ADA 1150 Peristaltic Liquid Pump with Silicone Tubing last week.
Initially, I was thinking to setup a diffusion cell with circulating system.
However, before I could really get the pumps on the system, one of the pumps has stopped working.
I have taken a photo of the pumps for comparision. It was in the beginning stage when I just tried to circulate water through the tubes.
The good pump (left) gave good circulation with continuous flow but the broken pump did not show any.
With some physical inspections, the sound and rotation of both pumps are the same. The only difference I can see is the rotation of the rollers. Please see the photo below. When there was power supply, the roller in the peristaltic pump should be rotating but not for the broken pump (right) at this stage.
Please advise what the potential cause could be.