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34
Operating Instructions
Troubleshooting
Even after use has finished,
the whirring of a fan can be
heard for a while.
Whenever the power switch
is turned “On” or “Off”, a
hot water tap is opened or
closed, or after the unit is
used, the sound of a motor
spinning may be heard.
• The sound is from the unit operating for fast ignition and quicker
stabilization of water temperature during reuse.
Problems concerning sound
Burner is extinguished
during use
• Are the gas valve and water supply tap fully opened?
• Has the water supply been shut down?
• Is the hot water tap opened sufficiently?
• Is there a cut-off of gas by the gas meter?
(Can any other gas-powered equipment, such as a cooker, be used?)
• The combustion gas which had been collected heat at the secondary
heat exchanger is low-temperature and has high moisture content,
so it builds up condensation with the outside air and looks like white
steam.
White vapor is emitted from
the exhaust vent or flue
terminal on cold days.
Hot water seems cloudy
• This is simply air that had been dissolved in the water being forced out
in the form of minute bubbles when heated, and is totally harmless.
• When there is high pressure within the unit, the pressure relief
device will operate and droplets of water may be noticed from the
trap plug.
Water is discharged mo-
mentarily from the trap
plug of the unit (pressure
relief device)
• Your bathtub and washbasin may look slightly bluish due to minute
amounts of cuprous ions and fat (lime scale), but this poses no
problem to your health. This can be prevented by frequent cleaning
of the bathtub and washbasin.
Water seems bluish
The bath tub or wash ba-
sin turned blue
Others
Frequent water discharge
from the drain pipe.
• Condensation forms inside the unit during operation
and is discharged from the drain pipe.
