A.O. Smith GCV300 Service Handbook - Pil
Residential Standard Gas Water Heater Service Handbook • 9
PIL
O
T/FLASH C
ODE
S
LIGHTING THE PILOT / DIAGNOSTIC FLASH CODES
LighƟ ng the Pilot:
1.
Read and follow the lighting
instructions on the water heater’s
label.
2. Turn the control knob to “Pilot.”
Press the knob in fully and hold it in.
(The knob will travel in about 1/4-
inch if it is set to Pilot correctly.)
3. While holding the control knob in,
click the igniter button continuously
for up to 90 seconds or until the
Status Light begins to blink.
If the status light does not begin
to blink after 90 seconds, STOP.
Release the control knob. Wait
10 minutes before attempting to
relight the Pilot. Repeat these steps
2-3 times, if necessary.
The circuitry in this gas valve
requires that you wait 10 minutes
between lighting attempts.
If the Status Light blinks, release
the gas control/temperature knob
and turn it to the desired setting.
(“Hot” is approximately 120°F).
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Figure 6.
If the Status Light Does
Not Blink:
1.
Wait 10 minutes before another
lighting attempt.
2. If the status light did not blink, repeat
the lighting procedure by following
the lighting instructions on the water
heater’s label. Remove the outer
door. The control knob must be set
to Pilot and held in continuously
while clicking the igniter button
(about once per second for up to
90 seconds). To observe the Pilot,
remove the outer door and look
through the view port (sight glass).
See Figure 7.
3. Continue clicking the Igniter button
(for up to 90 seconds) until pilot
lights.
4. Once the pilot is lit, continue to hold
the control knob in until the Status
Light begins to blink.
5. Release control Knob and set Knob to
desired temperature setting. (“Hot”
is approximately 120°F.)
6. Replace the outer door.
If the Pilot Does Not
Light:
1.
Wait 10 minutes before another
lighting attempt. If the pilot does not
light, the Igniter may not be sparking
or the unit may not be getting gas (or
for a new installation, there may still
be air in the gas line). Each time you
click the igniter button, you should
be able to see the spark by looking
through the view port. See Figure 7.
(You may have to darken the room
lights to see the spark.) You do not
have to push the Control Knob in
to check the Igniter button. Simply
look through the sight glass while
clicking the Igniter button and look
for a spark. If you can’t see a spark
when the Igniter button is clicked,
check the wiring connections from
the Igniter button and make sure
that they are tight.
2.
If you see the igniter spark, try
relighting the pilot by following the
instructions on the water heater’s
label. Ensure that the gas supply is
turned on. There may be air in the
gas line, and several lighting attempts
may be needed to completely fill the
line with gas and successfully light
the pilot.
VAC
THERMAL
SWITCH
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dDWZdhZ KhdZKKZ EKd^,KtE d,ZDKW/> t/ZKEEd/KE^ Figure 7. 1. If the pilot lights, continue to hold the control knob in until the status light blinks. If the pilot is lit and remains lit for 90 seconds and the Status Light still does not blink, the thermopile connections may be loose, the thermal switch may need to be reset, or the thermopile may be defective. 2. Remove the outer door. 3. Press the reset button on the thermal switch (TCO switch). See Figure 7. 4. If the switch clicks, it may have tripped. Do not light the pilot if flammable vapors are present. Check flame arrestor for signs of discoloration (which could be caused by flammable vapors). If the flame arrestor is discolored, do not attempt to relight the Pilot. Have the water heater inspected by a qualified service technician. 5. Check the wiring connections from the thermopile and thermal switch (TCO) to the gas control valve/thermostat. Ensure that all wiring connections are tight. See Figure 7. 6. Replace the outer door.If the Pilot Lights but the
Status Light Does Not
Blink: