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anthonyhartmanSep 14, 2025
What causes upper drive synchronization issues in my Pentair Control Unit?
- HHenry PetersonSep 14, 2025
If your Pentair Control Unit experiences upper drive synchronization issues, it could be due to a power failure while the electronic was compiling data (the system will recover automatically within a few minutes). Another cause could be that the board doesn’t receive the signal from the homing microswitch (motor runs for the 6 first minutes of UD display then shows ER0), check microswitches and associated wiring.
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