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14.
Maintenance
• The venting system must be examined periodically by a qualified service technician to check for
any leaks or corrosion.
• The burner flame must be checked periodically
for a proper blue color and consistency.
Check the burner flame periodically for a
proper blue color and consistency. The
burner flame must be blue, clear and stable.
The image of normal or abnormal flame is
as shown figure right. If the flame does not
appear normal, the burner may need to be
cleaned by qualified service technician.
• Do not obstruct the flow of combustion and ventilation air.
• The pressure relief valve must be operated once a year to ensure that it is functioning properly and
there is no obstruction. Turn the power off to the unit before opening the relief valve, and make sure
that water draining out of the valve will not cause any damage.
• If the relief valve discharges periodically, it may be due to thermal expansion in a closed water sys-
tem. Contact the water supplier or a local plumbing inspector on how to correct this situation.
Do not plug the relief valve.
• See the Owner's Guide for further maintenance.
Warning: There is a scald potential if the output temperature is set too high.
Should overheating occur, or the gas supply fail to shut off, turn off the manual gas control valve to the appliance.
Do not use this appliance if any part has been under water. Immediately call a qualified service techni-
cian to inspect the appliance and to replace any part of the control system and any gas control which
has been under water.
Periodically check and clean the filter inside the cold water inlet of the unit.
15.
Trial Operation
• Preparation ........... (1) Open a hot water fixture to confirm that water is available, and then close
(1) Open a hot water fixture and confirm that the Burner On lamp comes on, and that hot water is
being produced. (If necessary, repeat until the air in the gas piping is bled out).
* White smoke may be noticed from the exhaust vent during cold weather. However, this is not a
malfunction of the unit.
* If an "11" error code appears on the remote controller, turn the unit off and then back on again,
and then open a hot water fixture again.
(2) Change the temperature setting on the remote controller and check that the water temperature changes.
• If the water heater does not operate normally, refer to "Troubleshooting" in the Owner's Guide.
* After the trial operation, clean the filter in the cold water inlet.
<If installed with a quick connect multi-system>
• Turn the system power ON with the remote controller.
• Slowly open a hot water fixture and check that the units ignite sequentially. Check to see that the
hot water temperature is the same as the temperature displayed on the remote controller (*1)
38
the fixture.
(2) Open the gas supply valve.
(3) Turn on the power supply. Using the remote controller, turn on the Power
On/Off button (the Operation lamp will turn on).
Periodically check the following to ensure proper
operation of the water heater.
Blue Flame
Burner
e.g.) Normal Burner Flame
The installer should test operate the unit, explain to
the customer how to use the unit, and give the owner
this manual before leaving the installation.
Yellow Flame or
Lifting Flame
Burner
e.g.) Abnormal Burner Flame
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