17
Regular Maintenance / Troubleshooting
• For people who live in a hard water area, periodic
flushing is necessary. If the Heat Exchanger is not
flushed, the Scale Build-up may cause damage to
the Heat Exchanger.
To prevent damage to the Heat Exchanger, the
Heat Exchanger regularly needs to be flushed.
• This Water Heater is equipped with an automatic
service reminder to announce for flushing the
Heat Exchanger.
The factory default of this service reminder is
disable.
If desired, the customer or installer needs to
enable the service reminder (connect the red
connector marked “SERVICE REMINDER”).
Refer to the “Water Treatment: About the Service
Reminder” in the Installation Manual.
• If the service reminder is selected to ON, the
code “C1#”(#=1,2,3,4 ... 9) will displayed on the
Remote Controller after the set time period has
been reached. When the code is displayed, the
Heat Exchanger needs to be flushed to prevent
damage from Scale Build-up. Refer to the
“Procedure for flushing the Heat Exchanger” in
the Installation Manual or contact Noritz America
for more information. (http://support.noritz.com/
or 1-866-766-7489)
• Damage to the Water Heater as a result of below
is not covered by the Noritz America Limited
Warranty. To ensure full warranty coverage, treat
or condition water that exceeds the target levels
provided in this table.
- Water in excess of 12 gpg (200 mg/L) of
hardness
- Poor water quality (see the following table)
- The Water Heater has displayed a “C1#”
(Service Reminder) indicating Scale Build-up,
but the Heat Exchanger has not been flushed.
Contaminant
Maximum Allowable Level
Total Hardness*
200 mg/L (12 gpg) or less
Aluminum
0.05 to 0.2 mg/L or less
Chloride
250 mg/L or less
Copper
1.0 mg/L or less
Iron
0.3 mg/L or less
Manganese
0.05 mg/L or less
pH
6.5-8.5
Total Dissolved Solids 500 mg/L or less
Zinc
5 mg/L or less
Sulfate
250 mg/L or less
Residual chlorine*
4 mg/L or less
Source: EPA National Secondary Drinking Water
Regulations (40 CFR Part 143.3)
* Maximum limit suggested by Noritz.
Water Quality and Maintenance
Initial Operation
Temperature
Troubleshooting
The Water Heater does not attempt to ignite
when water is running.
• Check for reversed plumbing or crossed pipes.
• Check the water filter. (See page 16)
The Water Heater attempts to ignite but fails.
• Reset the Water Heater and try again. There may
be air in the gas line.
• Have a professional check the gas supply
pressure.
Hot water is not available when a fixture is
opened.
• 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?)
• Is the water filter clogged? (See page 16)
• Is the button turned ON?
No water is available when a fixture is opened.
• Is the water supply cut off?
• Is the Water Heater frozen?
Remote Controller
The POWER indicator does not light up.
• 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 flow 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 affixed
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.
