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21
Operating the Temperature Control System
Figure 19B: Status Codes
VAC
List of status codes are shown
at top of gas control valve/thermostat.
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
The gas control valve has two different operating modes:
Standard and Vacation.
Standard mode allows you to adjust the water temperature
to your desired setting.
Vacation (VAC) mode sets the thermostat at approximately
55°F and is recommended when not using hot water for
an extended period of time. The VAC setting also reduces
energy losses and keeps the tank from freezing during cold
weather, but it can cause a Hydrogen gas build up in the
water system. See caution on page 2.
NOTE: The actual temperature of the water in most
installations will be greater than 55°F due to the
surrounding environment and the pilot flame.
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).
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