Troubleshooting Guide - A.O. Smith LILY User Manual

Troubleshooting Guide

FAILURE EXPERIENCED
• The power source is not connected.
The machine will not
• Low inlet water pressure or no water.
start
• Low-pressure switch failure, cannot connect the power
source.
• High-pressure switch cannot be restored.
• Switch Mode Power Supply is burned out.
• High-pressure pump burned out.
• Transformer burned out.
• No output voltage from control PCB
The high pressure pump
• High-pressure pump has lost pressure.
• A pre-filter is blocked.
is working properly,
• Check valve is blocked. (waste water, no pure water)
but no water is being
• The RO Membrane is plugged.
produced
• Inlet water valve is faulty, no water can get in.
• Control PCB cannot shut off flushing valve.
The storage tank is full • Storage tank doesn't have enough pressure.
• PAC filter is plugged.
but no pure
• High-pressure pump pressure is not reaching 0.3MPa,
water is flowing out
the storage tank internal pressure cannot reach the set
high pressure.
The machine produces • High-pressure problem.
• High-pressure pump has lost pressure.
continuous pure water
• Inlet water solenoid valve is faulty.
The machine is turned off • Flush solenoid valve failed, cannot effectively
cut off the water supply.
but waste water has not
• Check valve has lost pressure. (small W.W. flow rate)
stopped
After the machine is • Check valve has lost pressure.
• High-pressure switch failure.
filled with water, the
• System is exhibiting a loss of pressure.
machine starts repeatedly
The pure water flow is • Pre-filter is plugged.
• RO membrane is plugged.
small or not flowing
• Inlet water solenoid valve failure.
• Check valve is plugged.
• PAC filter is plugged.
• High pressure pump pressure is not enough.
ENG 22
REASON SOLUTION METHOD
• Check the power source or the power source plug.
• Check the inlet water pressure.
• After connecting the inlet water, measure the resistance,
replace.
• After letting off the pressure, measure the resistance,
replace.
• Measure the output voltage, replace.
• Replace the high-pressure pump.
• Check the transformer input voltage/overload.
• Measure the output voltage, replace.
• Measure the water pump pressure, replace.
• Observe the pure water and waste water, replace the pre-filter.
• Replace the check valve.
• Clean or replace the RO membrane.
• Replace the inlet water valve.
• Measure input voltage for flushing valve, replace control PCB
• Inflate the storage bucket, empty tank pressure
should be between 0.05 and 0.07MPa.
• Replace the PAC filter.
• Measure the pressure from the water pressure pump,
replace.
• Measure the pressure.
• Measure the water pump pressure, replace.
• Replace the Inlet water solenoid valve.
• Observe the waste water, replace the Flush solenoid valve.
• Observe the waste water, replace the check valve.
• Replace the check valve.
• Replace the high pressure switch.
• After checking the check valve, check whether
there is water leakage in the pipelines.
• Replace the pre-filter.
• Wash or replace the RO membrane.
• Replace the Inlet water solenoid valve.
• Replace the check valve.
• Replace the PAC filter.
• Measure the high pressure pump water pressure, replace.