Dolphin Diagnostic stops intermittently

by Dave Szabo
(Branchburg, NJ)

My dolphin diagnostic is about 10 - 12 years old. It now stops after 5 - 10 minutes of running, but after 2-3 cycles of stopping and restarting it will then run a full cycle.

The following items have been checked:
- filter is clean
- belts and drive train are free of debris
- There is 38 dc volts at the power supply plug
- Its only May so the water temp is still around 60 degrees, maybe colder
- pool is crystal clear with no algae and minimal debris on the floor
- the Motor assembly number is 103390VS35

If I pull the unplug the vacuum from the power supply and then reconnect, the unit will not start. To restart the unit I need to shut off the supply at the switch, unplug the power supply from the wall, pause for a few seconds, plug in and turn switch on. Note that I do not move the vacuum or cable during this sequence so I know its not a bad cable connection.

I have not taken the power supply apart but it seems as though there must be a signal going to the vacuum to restart the motor. Does the timer in the power supply kill the 38 VDC or does it send a signal to the vacuum to stop?

Any thoughts are appreciated.

Dave Szabo

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