28 • Residential Gas Water Heater Use and Care Guide
Status Light and Diagnostic Code Troubleshooting Chart
LED STATUS OR ERROR CODE
INDICATES
CORRECTIVE ACTION
0 FLASHES (LED NOT LIT)
Pilot light is not lit or thermopile has not yet
reached normal operating temperature.
Turn Gas Control Valve/Thermostat knob to “OFF”.
Wait 10 minutes, then attempt to relight Pilot by
following the lighting instructions on the water
heater’s label. Until the thermopile reaches its
normal operating temperature, the Status Light
will not blink, even if the Pilot is lit. It may take
up to 90 seconds of continuous Pilot operation
before the thermopile reaches normal operating
temperature and the Status Light starts to blink. If
the Status Light does not blink after three lighting
attempts, check to make sure unit is getting
gas. Remove the outer door. Press reset button.
Replace outer door. Turn Gas Control Valve/
Thermostat knob to “OFF”. Wait 10 minutes, then
attempt to light Pilot by following the lighting
instructions on the water heater’s label. Look
through the view port for the Pilot flame. If Pilot
is not visible, the spark igniter or gas supply to the
Pilot should be checked. If the Pilot is visible and
the Status Light does not blink after 90 seconds
of continuous Pilot operation, the Pilot flame may
not be heating the thermopile sufficiently (weak
Pilot), the thermopile may be defective, or wiring
connectors may be loose.
RED LIGHT ON (SOLID)
Pilot light was recently extinguished and the
thermopile is cooling down.
Turn Gas Control Valve/Thermostat knob to “OFF”.
Wait 10 minutes for the thermopile to cool, then
attempt to relight Pilot by following the lighting
instructions on the water heater’s label.
NOTE: This gas control valve/thermostat has
built-in circuitry that requires waiting 10 minutes
between lighting attempts.
Until the thermopile reaches its normal operating
temperature, the Status Light will not blink, even
if the Pilot is lit. It may take up to 90 seconds of
continuous Pilot operation before the thermopile
reaches normal operating temperature and the
Status Light starts to blink.
1 FLASH (EVERY 3 SECONDS)
Normal Operation
No corrective action necessary.
2 FLASHES
Pilot is lit but the thermopile is not producing the
required output voltage.
Turn Gas Control Valve/Thermostat knob to “OFF”.
The thermopile is probably defective, but loose
wiring connections or a weak Pilot flame can also
cause this symptom.
4 FLASHES
The Gas Control Valve’s temperature sensor has
detected that the water temperature was too high.
Once this condition occurs, the Main Burner and
the Pilot Light will be shut off. Since the Pilot light
will be off, should this condition occur, this Flash
Code will only be displayed immediately after
the Pilot has been relit. Turn Gas Control Valve/
Thermostat knob to “OFF”.
Relight pilot and verify 4 flashes. If 4 flashes are
observed, turn Gas Control Valve/Thermostat knob
to “OFF”. Turn Main Gas Supply “OFF.” Replace the
Gas Control Valve/Thermostat. See “Removing and
Replacing the Gas Control Valve/Thermostat.”
5 FLASHES
The temperature sensor (thermistor) is defective.
Turn Gas Control Valve/Thermostat knob to “OFF”.
Replace the temperature sensor (thermistor).
7 FLASHES
Gas Control Valve failure.
Turn Gas Control Valve/Thermostat knob to “OFF”.
Turn Main Gas Supply “OFF”. Replace the Gas
Control Valve/Thermostat. See “Removing and
Replacing the Gas Control Valve/Thermostat.”
TROUBLESHOOTING
TR
OUBLE
SHOO
TING
