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What does a flashing H mean on the ATV21 and ATV212 drives?
Altivar 21 and 212
Flashing H and he drive resets
The flashing H means the drive controller is approaching an overheating fault.
Check the heat sink cooling on the drive. If this is an S-Flex check for anything that might restrict air flow near the top of the drives vent and still check the drives cooling fan.