Status Light And Diagnostic Code Troubleshooting Chart - A.O. Smith GAS WATER HEATER Installation Instructions And Use & Care Manual

STATUS LIGHT AND DIAGNOSTIC CODE TROUBLESHOOTING CHART

LED STATUS
0 FLASHES (LED NOT LIT)
RED LIGHT ON (SOLID)
1 FLASH (EVERY 3 SECONDS)
2 FLASHES
PROBLEM
Pilot light is not lit or Thermopile
has not yet reached normal
operating temperature.
Pilot light was recently
extinguished and the Thermopile
is cooling down.
Normal operation.
Pilot is lit but the Thermopile is
not producing the required output
voltage.
33
CORRECTIVE ACTION
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.
NOTE: If the water heater has been operating but
has stopped and will not re-light, check the flame-
arrestor for signs of high temperature (blue or black)
discoloration indicating a flammable vapor incident. If
you suspect a flammable vapor incident has occurred,
do not use this appliance. Immediately call a qualified
technician to inspect the appliance. Water heaters
subjected to a flammable vapors ignition will require
replacement of the entire water heater.
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
NOTE: This gas control
the water heater's label.
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.
No corrective action necessary.
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.