Lighting The Pilot / Diagnostic Flash Codes; Lighting The Pilot; If The Status Light Does Not Blink; If The Pilot Does Not Light - A.O. Smith GCV300 Service Handbook

LIGHTING THE PILOT / DIAGNOSTIC FLASH CODES

Ligh ng the Pilot:
1. Read and follow the
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.
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).
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
lighting
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
Wait
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.
V
If the Pilot Lights but the
Status Light Does Not
Blink:
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
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
from the thermopile and thermal
switch (TCO) to the gas control
valve/thermostat.
all wiring connections are tight.
See Figure 7.
6. Replace the outer door.
Residential Standard Gas Water Heater Service Handbook • 9
V TAT
V A C
THERMAL
SWITCH
Figure 7.
vapors are present.
the wiring connections
Ensure that