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Possible fault sources:
a.When no oil is available inside the pump, pump core runs and causes dry friction, such that the pump core is heated up and glued (long-term operation without oil taking is not allowed)
b.Foreign substances occur inside the pump such that the pump core is stuck
Recommended solutions:
a.Shut down the dispenser immediately; wait till it is cool, reassemble the pump core, and replace it if it is already damaged
b.Disassemble and clean up the pump for recovery