A.O. Smith GPD-40 Instruction Manual page 32

# LED STATUS
7
8
9
10
11
12
13
14
15
16
PROBLEM
Self diagnostic check has detected
a problem with the gas valve driver
circuit, internal microprocessor, or
other internal circuits.
The gas control valve/thermostat
has sensed main burner fl ame out
of proper sequence.
Water temperature in the tank has
exceeded 195° F and has activated
the ECO (energy cut off) high
temperature limit.
Self diagnostic check has detected
that one or both of the temperature
adjust buttons are stuck.
Self diagnostic check has detected
the water temperature sensor
(located in the control valve's
immersion probe) is either open or
shorted.
Self diagnostic check has detected
the FV (fl ammable vapor) sensor is
either open or shorted.
Self diagnostic check has detected
the presence of fl ammable vapors
from the FV (fl ammable vapor)
sensor.
The gas control valve/thermostat
has detected the air pressure switch
circuit is opening repeatedly during
one heating cycle.
LDO (Lint, Dust, and Oil) lockout
condition.
32
SOLUTION
1 Turn the power off for 10-20 seconds then on again to
clear these error codes.
2 If any of these error codes persist or cannot be cleared
- replace the gas control valve/thermostat.
1 Turn the power off for 10-20 seconds then on again to
clear these error codes.
2 Replace the gas control valve/thermostat if this error
code persists.
1 Turn the power off for 10-20 seconds then on again to
clear these error codes.
2 Replace the gas control valve/thermostat if the error
code persists.
1 Press and release both temperature adjust buttons
several times - cycle water heater power off and on.
2 Replace the gas control valve/thermostat if the error
code persists.
1 Turn the power off for 10-20 seconds then on again to
clear these error codes.
2 Replace the gas control valve/thermostat if the error
code persists.
1 Turn off power to the water heater. Ensure all FV
sensor wiring, the ignitor assembly plug, and the ignitor
assembly socket on the bottom of the Intellivent control
are making good contact. Repair or replace any
worn/damaged components that are not making good
connection.
2 Replace the FV sensor.
1 Do not touch any electrical switch, do not use any
phone in your building, and do not try to light any
appliance.
2 Smell around the water heater to ensure there are
no gas leaks at the gas control valve/thermostat, in
the supply gas line(s), or any other type of fl ammable
vapor(s) in the area.
3 Carefully inspect the area surrounding the water heater
for any substances such as gasoline, paint, paint
thinners, varnish, or cleaners that could emit fl ammable
vapors. Remove anything that can potentially emit
fl ammable vapors from the area and store it properly in
a different location.
4 Call the technical information support phone number
shown on the water heater labeling for further
assistance.
1 On models equipped with a dilution air intake screen on
the blower assembly - check/clean this screen.
2 On models equipped with a combustion air intake
screen on the base ring (bottom) of the water heater -
check/clean the screen.
3 Ensure intake air screen(s) on models so equipped are
not obstructed.