Hello. Starting a new thread as I have read every single thing I can find and have not seen any issue which mimics what I am experiencing. I have a Dolphin Nautilus CC Plus, a few years old. Was working fine until this year. I put the cleaner in the pool and it starts and runs just fine for a few minutes and then it stops. Sounds typical, but it gets more interesting.
I have been through all the other topics (checked impeller, took it apart, testing cable, checked the swivel, took apart treads, etc.). What is unique about what I am experiencing is that it will run for 2.5 minutes every time and then stop on the first wall it attempts to climb after 2.5 minutes. If it is on a wall when it reaches 2.5 minutes, is stops and drops to bottom immediately. Prior to 2.5 minutes it runs perfectly, climbs walls, etc. I have timed it dozens of times and it stops at 2.5 minutes every time.
I ran the power supply independently from the robot and it turns on and does not turn off at 2.5 minutes, so I presume it is something in the robot that is shutting it down.
I have not taken apart the motor assembly yet to inspect bearings, brushes, etc. but was hoping for some helpful guidance before going the next step if folks have seen this behavior before.
UPDATE: I took apart the entire cleaner today and did not notice anything out of the ordinary. When putting it back together, I tested the robot at each step of the way.
The robot will run continuously if the blue cover is not on the robot! If I add the cover back on the robot, it stops every time. Please help. There is nothing in the cover that I can tell that will prevent the robot from running other than potentially impacting the water flow somehow. I even added weight to the robot with the cover off and it ran fine.
Thanks
I have been through all the other topics (checked impeller, took it apart, testing cable, checked the swivel, took apart treads, etc.). What is unique about what I am experiencing is that it will run for 2.5 minutes every time and then stop on the first wall it attempts to climb after 2.5 minutes. If it is on a wall when it reaches 2.5 minutes, is stops and drops to bottom immediately. Prior to 2.5 minutes it runs perfectly, climbs walls, etc. I have timed it dozens of times and it stops at 2.5 minutes every time.
I ran the power supply independently from the robot and it turns on and does not turn off at 2.5 minutes, so I presume it is something in the robot that is shutting it down.
I have not taken apart the motor assembly yet to inspect bearings, brushes, etc. but was hoping for some helpful guidance before going the next step if folks have seen this behavior before.
UPDATE: I took apart the entire cleaner today and did not notice anything out of the ordinary. When putting it back together, I tested the robot at each step of the way.
The robot will run continuously if the blue cover is not on the robot! If I add the cover back on the robot, it stops every time. Please help. There is nothing in the cover that I can tell that will prevent the robot from running other than potentially impacting the water flow somehow. I even added weight to the robot with the cover off and it ran fine.
Thanks
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I'm afraid I don't have a good answer for your situation. 
Figured it was time to welcome you and try to give this question some visibility. Maybe another Dolphin owner can give you some ideas. Thanks for posting and enjoy the forum. 
