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Remote controller
The water temperature changes
after a power failure or when the
power is disconnected.
The operation light does
not come on
• Has there been a power failure?
• Is the power connected properly?
• The time on the controller may need to be reset after a
power failure or after the power has been disconnected.
Also, the hot water temperature indicator, and tub level
alarm may have been reset.
Amount of hot water
The pressure at a certain
fixture is not constant.
• When hot water is demanded at other fixtures, the
amount available may be reduced.
• Pressure fluctuations and other plumbing conditions can
cause the temperature and pressure at a fixture to be
unstable, but it should stabilize after a short time.
• To keep the temperature stable, the heater limits the
amount of water that can flow through it to a small
amount initially, but the amount increases over time.
The display (LCD) is unstable.
• The liquid crystal display may become unstable when
the remote controller is cleaned with a dry cloth (Leave it
for 30 minutes and it will return to normal).
Other
The Heater stops burning during
operation.
• Are the gas and water supply valves fully open?
• Is the water supply cut off?
• Is the hot water fixture sufficiently open?
• Is the gas meter working?
• (For LP) Is there enough gas in the tank?
• This is normal on cold days.White smoke comes out of the
exhaust vent on a cold day.
The hot water becomes turbid.
• This is harmless. Small bubbles appear as the air in the
water is heated and depressurized rapidly to
atmospheric pressure. It is similar to the bubbles in beer
or carbonated beverages.
Water leaks from the drain plugs on
the outlet.
• When the main unit is highly pressurized, water will leak
from the drain plugs as a safety so that the unit is not
damaged by the high pressure.
• These plugs are pressure relief valves. If water is
leaking out of them, excessive pressure is being
supplied to the unit.
Sound
The fan can be heard after
operation is stopped.
• The fan runs for a while to accelerate ignition after the
operation button is turned on.
Troubleshooting-2
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