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Troubleshooting for the machine failing to stop after the water tank is full:
Cause of failure: a. High-pressure switch malfunction
Solution: a. Replace the high-pressure switch.
Troubleshooting for pump stoppage with water draining from the outlet:
Cause of failure: a. Inlet solenoid valve malfunction
Solution: a. Replace the inlet solenoid valve.
Troubleshooting for leakage from the outlet after the water tank is full:
Cause of failure: a. RO membrane housing check valve malfunction
Solution: a. Replace the RO membrane housing check valve.
When this machine malfunctions, we recommend that you first try the above methods for diagnosis and troubleshooting. If the problem cannot be resolved, please call our service hotline 400-884-6567 immediately for assistance from UPU Ultrapure Water engineers.