Sequence Of Operation Chart - A.O. Smith High Efficiency 100 series Installation Instructions Manual

Apply Power
to Appliance.
Is there a
Call for Heat.
Y
Will not attempt to light. 2
flash error code. See
Is Damper
N
Corrective Action Table
Closed?
on pages 31-32.
Damper Energizes.
Gas Valve attempts to open damper
for 30 seconds, displays 3 flash error
code, and then waits 2 mintues before
N
Is Damper
attempting to open damper again. See
Open?
Corrective Action Table pages 31-32.
Pilot Valve
Energizes
Will not light. 8-4 flash
Does Pilot
N
error code. See Corrective
Valve Open?
Action Table on pages 31-32.
Spark Electrode
is Energized
Is
Pilot Flame
N
Sensed Within
1.5 min. ?
Main Valve
Energized
Does Main
N
Valve Open?
Is Main
N
Flame Sensed?
Is Demand for
N
Heat Satisfied?
Pilot & Main
Valve De-Energize.
Is Flame
Y
Sensed?
Damper Energizes
and Closes.

SEQUENCE OF OPERATION CHART

Will not light. 8-4 flash
error code. See Corrective
Action Table on pages 31-32.
Will not light. 8-4 flash
error code. See Corrective
Action Table on pages 31-32.
Will not light. 8-4 flash
error code. See Corrective
Action Table on pages 31-32.
Water heater will continue to
operate normally until
demand is satisfied.
Wait for flame lost, 5 flash
error code. See Corrective
Action Table, pages 31-32.
Damper closes, displays 6-4
Flash Error Code, and gas
control valve goes into 20
minute lockout. See Corrective
Action Table, pages 31-32.
33