Operating the Temperature Control System
Figure 19B: Status Codes
List of status codes are shown
at top of gas control valve/thermostat.
VAC 
Water Temperature Adjustment
The water temperature setting can be adjusted from 55°F to 155°F. Turn the Gas Control/Temperature Knob to the desired setting/temperature.
NOTE: The temperatures indicated are approximates. The actual temperature of the heated water may vary. Also, some models are certified for 180°F outlet temperatures. See the Data Plate on the front of the water heater for the maximum outlet temperature.
Operating Modes and Settings
•Standard Mode - The controller adjusts the water heater to maintain the temperature set by the user.
•Vacation Setting - The Vacation Setting (VAC) sets the controller at approximately 55°F. This setting is recommended when the water heater is not in use for a long period of time. This effectively turns the controller temperature setting down to a temperature that prevents the water in the water heater from freezing while still conserving energy.
Status Light Codes
Normal Flashes:
• 0 Flashes Indicates Control Off/Pilot Out.
•1 Flash Indicates Normal Operation.
•Continuous Light indicates the gas control valve/thermostat is shutting down.
Diagnostic Flashes: If the water heater is not working, look for the following diagnostic flashes after lighting the pilot.
2 Flashes | Indicates thermopile voltage is low. |
4 Flashes | Indicates overheat failure. |
5 Flashes | Indicates water temperature sensor failure. |
7 Flashes | Indicates electronic control failure. |
8 Flashes | See “Status Light Code Troubleshooting Chart.” |
9 Flashes | Indicates chamber temperature sensor circuit |
| is open or shorted. |
10 Flashes Indicates an LDO occurrence was detected in the combustion chamber (contaminants).
Operational Conditions
Condensation
Moisture from the products of combustion condenses on the tank surface and the outside jacket of the water heater and forms drops of water which may fall onto the burner or other hot surfaces. This will produce a “sizzling” or “frying” noise. NOTE: This condensation is normal and should not be confused with a leaking tank. Condensation may increase or decrease at different times of the year.
High efficient energy saver water heaters will produce larger amounts of condensation on initial
IMPORTANT: It is always recommended that a suitable metal drain pan be installed under the water heater
to protect the area from water damage resulting from normal condensation production, a leaking tank or piping connections. Refer to “Location Requirements” on page
4.Under no circumstances is the manufacturer to be held responsible for any water damage in connection with this water heater.
Water Heater Sounds
During the normal operation of the water heater, sounds or noises may be heard. These noises are common and may result from the following:
1.Normal expansion and contraction of metal parts during periods of
2.Condensation causes sizzling and popping within the burner area and should be considered normal.
3.Sediment buildup in the tank bottom will create varying amounts of noise and may cause premature tank fail- ure. Drain and flush the tank as directed under “Drain- ing and Flushing”.
Smoke/Odor
The water heater may give off a small amount of smoke and odor during the initial
Safety Shut-off
This water heater is designed to automatically
1.The pilot flame is extinguished for any reason.
2.The water temperature exceeds 189°F (87°C).
3.Excessive contaminants in the combustion chamber.
4.The ignition of flammable vapors.
A thermopile is used to determine if a pilot flame is present and will shut off the gas supply to the main burner and pilot if the flame is absent. This unit is also equipped with a combustion chamber temperature sensor that will shut off
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