User Guide
29
Other
Problems What to do
Display Window
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 xture sufciently 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 bath 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 bath tub/wash-basin can be
prevented by cleaning frequently.
Frequent water discharge
from the drain pipe.
Condensation forms inside the unit during operation
and is discharged from the drain pipe.
Amount of Hot Water
Problems What to do
Display Window
The amount of hot water
at a certain xture is not
constant.
When hot water is demanded at other xtures, the
amount available may be reduced. The maximum
ow available from this unit is 6.3 GPM (24.0L/min.)
at a 45°F (25°C) temperature rise.
Pressure uctuations and other plumbing conditions
can cause the temperature and pressure at a xture 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 rst but stabilize after time.
To keep the temperature stable, the heater limits the
amount of water that can ow through it to a low ow
initially, but the amount increases over time.
[Using the optional remote controller]
The amount of hot water in
the tub is less/more than the
set amount when using the
ow meter alarm feature.
When hot water is used for other xtures while lling
the bath tub, the tub will not ll as much.
If there is water in the tub already, or when lling is
stopped and restarted, the tub will ll more.
[Using the optional remote controller]
The ow meter alarm does
not sound even when lled
to the set amount.
The ow 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 xture, the tub will ll more than
the setting of the ow meter alarm.
Amount of hot water
available has decreased
over time.
Is the water lter clogged? (page 23)
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 ushing the unit
periodically. To prevent scale from forming in the water
heater, a water softener or scale inhibitor is recommended.
Optional Remote Controller
Problems What to do
Display Window
The light on the power
button does not come on.
Has there been a power failure?
Is the power connected properly?
The water temperature changes
after a power failure or when
the power is disconnected.
The temperature setting and the ow meter alarm
setting may both need to be reset after a power
outage.
The plastic on the surface
or buttons of the remote
controller has torn,
peeled, or air bubbles
inside.
The surface of the remote controller is afxed with a
protective sheet (to prevent surface scratching, etc.) at
time of shipment. This sheet can be removed or left as it
is. When leaving the protective sheet on, areas frequently
touched may tear or peel. However, the remote controller
will not malfunction from water entering such torn or
peeled areas. To restore the appearance of the remote
controller surface, simply remove the protective sheet.
Sounds
Problems What to do
Display Window
The fan can be heard after
operation is stopped.
A motor can be heard when turning
the unit ON or OFF, when opening
or closing a xture, or after the unit
has been running for a while.
These noises indicate the proper operation of devices
which are designed to let the unit reignite more
quickly, and ensure the water temperature is stable.
The fan can be heard when
it is very cold outside.
The fan may run to prevent freezing.
There is a buzzing, beeping
or humming noise emitting
from the unit.
This noise is a normal function of the unit.
The valves that control the water ow through the unit
move during operation and also when the unit is not
heating water.
Loud rumbling noise on
start up or during operation
emitting from the unit or vent
system.
The unit may need adjustments done for installations
higher than 2000ft above sea level or for longer
vent runs. Please contact your installer or Noritz to
verify the unit dip switches are set correctly for your
installation.