Troubleshooting - A.O. Smith ADR75-V-ET-1 User Manual

Trouble shooting
Power supply is not connected
low feed water pressure or no water
supply
Low pressure switch fails. Power
supply cannot be connected.
The machine
can't be started.
High pressure switch can't reset
Power switch is burned out
No output voltage from control unit
Refrigerating system is not powered on
No water or low-level water in pure
water tank
Compressor failure
Refrigerating
fails
Refrigerant leakage
Machine vibrates. water level in the
tank is not stable. High and low level
The machine
keeps powering
repeatedly after
Hot water temperature sensor failure
standby
Cold water temperature sensor failure
Filter blocking
RO membrane blocking
Small or no pure
Inlet solenoid valve failure
water output
Check valve blocking
Lack of pressure in high pressure
pump
High pressure pump failure
Inlet solenoid valve fail to open (no
pure water or wastewater)
The high pressure
pump works
normally but no
water is produced
RO membrane blocking
Control box failure. Can not turn
Inlet solenoid valve fails. Can not
System stops but
waste water
Decompression of check valve
doesn't stop
Heating system is not powered on.
Heating fails
No water or low-level water in
pure water tank
Heating rod failure
20
Check power supply or power supply socket
Check feed water pressure.
Measure resistance after feed water is
connected. Replace low pressure switch.
Measure resistance after decompression.
Replace high pressure switch.
Measure output voltage, replace power switch.
Measure output voltage, replace control unit.
Power on and turn on cold tank rocker switch
wait till water level in pure water tank
meets the requirement
Change compressor
of refrigeration system
Operate the machine after placing it in
Replace hot water temperature sensor
Replace cold water temperature
Replace RO membrane
Replace inlet solenoid valve
Replace check valve
Measure pump's outlet pressure.
Replace high pressure pump.
Measure pump's outlet pressure. Replace pump.
Replace inlet solenoid valve
Replace RO membrane
Check whether there is input
voltage. Replace control box.
Observe waste water. Replace inlet solenoid
valve
Observe waste water and replace check valve.
Power on and turn on hot tank rocker switch
Wait till water level in the water tank meets the
requirement.
Replace hot tank