31
Troubleshooting
Amount of Hot Water
The amount of hot water at a certain fixture is
not constant.
• When hot water is demanded at other fixtures,
the amount available may be reduced. The
maximum flow available from this Water
Heater is 8.7 GPM (33 L/min) at a 45°F (25°C)
temperature rise.
• 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.
• There are some types of hot water taps that
discharges large volumes of hot water at first but
stabilize after time.
• To keep the temperature stable, the Water
Heater limits the amount of water that can flow
through it to a small amount initially, but the
amount increases over time.
The amount of hot water in the tub is less/more
than the set amount.
• When hot water is used for other fixtures while
filling the tub, the tub will not fill as much.
• If there is water in the tub already, or when filling
is stopped and restarted, the tub will fill more.
The flow meter alarm does not sound even when
filled to the set amount.
• The flow meter alarm is set to sound when hot
water is continuously discharged for the set
volume of water.
If mixing valves are used, or if cold water is mixed
with hot water at the fixture, the tub will fill
more than the setting of the flow meter alarm.
Amount of hot water available has decreased
over time.
• Is the water filter clogged? (See page 29)
• If the supply water is hard and has not been
treated, scale can build-up in the Water Heater
and decrease the maximum amount of hot water
available. Scale can be removed from the Water
Heater by flushing the Water Heater periodically.
To prevent scale from forming in the Water
Heater, a water softener or scale inhibitor is
recommended.
Other
Sounds
The Water 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/faucet sufficiently open?
• Is the gas being cut off by the gas meter? (Can
other gas devices such as stoves be used?)
• (For LP) Is there enough gas in the tank? (Can
other gas devices such as stoves be used?)
White smoke comes out of the exhaust vent on a
cold day.
• This is normal. The white smoke is actually
steam.
The hot water is turbid.
• This is harmless. Small bubbles appear as the air
in the water is heated and depressurized rapidly
to atmospheric pressure.
The water appears blue.
The tub/wash-basin has turned blue.
• Coloration to a blue color may be noticed from
small traces of copper ion contained in the
water and fat (furring). However, there are not
problems concerning health. Coloration of the
tub/wash-basin can be prevented by cleaning
frequently.
Frequent water discharge from the condensate
drain pipe.
• Condensation forms inside the Water Heater
during operation and is discharged from the
condensate drain pipe.
A small amount of water is discharged from the
pressure relief valve.
• This is normal. When the Water Heater is under
high pressure, a small amount of water may be
discharged from the pressure relief valve.
The fan can be heard after operation is stopped.
A motor can be heard when turning the Water
Heater on or off, when opening or closing a
fixture, or after the Water Heater has been
running for a while.
• These noises indicate the proper operation of
devices which are designed to let the Water
Heater reignite more quickly, and ensure the
water temperature is stable.
Fluctuations in hot water temperatures.
• Set water temperature at 115°F to 120°F or 48°C
(118°F) to 50°C (122°F). This will allow you to
use a higher flow of hot water thus meeting the
minimum flow requirement of 0.29 GPM (1.1 L/
min)*.
*Minimum activation flow rate: 0.5 GPM (2.0 L/min)
Minimum operating flow rate: 0.29 GPM (1.1 L/min)
• Clean the water filter of any debris (See page 29)
Setting temperature cannot rise.
• Is the maximum temperature setting
appropriate? (See page 17)
