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ENGLISH
SOUNDS
TROUBLESHOOTING
Before calling for service, check whether the list below can solve
the problem you are dealing with.
The unit generates a number of different sounds during operation. The following sounds are not abnormal for the operation.
At startup
OPERATION
Sound generated
Type of operation
During operation
Unit is not operating
The water does not
become hot or it takes a
time for it to heat up
Water comes out of the
outdoor unit
Water comes out of the
tank unit
Steam is coming out of
the outdoor unit
No hot water
Water is coming out of
the safety pressure-relief
valve
The timer cannot be set
Rustling sounds, whoosh, bubbling sounds, splashing sounds.
This is the sound the refrigerant makes in the pipes or the sound of a valve changing the
ow of the refrigerant.
A change in the intensity of operating noise. Sounds indicating changes in operation capacity
to cope with temperature changes.
Check whether a power outage has occurred, a fuse is blown or the breaker has tripped.
Check whether the timer has been set and if it has been correctly set.
Check whether the water temperature is correctly set.
Check whether the air outlet or air inlet of the outdoor unit has been blocked.
Check whether the unit is operating in ECO mode.
Check whether the unit is leaking water.
The outdoor unit discharges water during defrosting.
In a cold area, this water could freeze so the water outlet on the outdoor unit must not be
blocked.
When the outdoor unit is installed overhead, use a bush to connect a drain pipe to the water
outlet to arrange proper discharge.
When the temperature of in coming water is very low and the atmosphere around the tank is
very humid, dew may form on surface of the metal or piping and may drop.
This is steam generated by frost melting during defrosting in the outdoor unit.
Check if a water outage has occurred. Turn the breaker off and close the water heater water
valve during a water outage.
During heating operation (when the indicator is lit or blinking), water leaking is normal.
When the indicator is lit or blinking, the water in the tank is expanding from being heated
and about 3% of tank capacity is discharged.
During operation other than heating (when the indicator is off), water leaking from the
water outlet indicates that the safety pressure-relief valve is defective.
Check whether the unit has been set to off-peak power supply.
The timer will not work when the unit is set to off-peak power supply.
Clackety-clack
Sound from solenoid valves
Check the following
Condition
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