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Page 13
Note: The Troubleshooting section replaces pages 4-6 in the Defender Atmospheric
service manual, p/n 238-44943-00.
L
ED Status Control Status Probable Cause Service Procedure
None (LED
not on or
flashin
g)
Electrical power not
present
Control power switch in "OFF"
position.
Su
pp
l
y
volta
g
e interru
p
ted.
Turn Power On
One short
flash every
four seconds
Stand-by mode,
Thermostat is
satisfied
(
no faults
)
Temperature demand is satisfied
(no call for heat)
Normal operation
Alternates
bright and
dim
(
heartbeat
)
Thermostat calling
for heat (no fault)
Tank temperature below
setpoint of thermostat
Normal operation
Short flash
once every
second
Weak pilot signal
on last call for heat
1. Unstable pilot
2. Pilot tube blocked or restricted
3. Oxidation build-up on pilot
electrode
4. Wire damage to pilot
assembly or bad connection at
gas control
1. See Burner Inspection on
page 17
2-4. See Pilot Inspection,
Testing and Replacement on
page 19
Two flashes,
three second
pause
Relay not working Faulty relay
1. Verify cord sets are fully
plugged in
2. See Relay Replacement on
p
a
g
e 28
Three
flashes,
three second
pause
Relay not working Faulty relay
1. Verify cord sets are fully
plugged in
2. See Relay Replacement on
page 28
Four flashes,
three second
pause
Excessive tank
temperature,
system must be
reset
1. Thermal well sensor out of
calibration
2. Faulty gas control
1. Test Gas Control & Thermal
Well
2. Replace gas control if
necessar
y
Five flashes,
three second
pause
False pilot flame
present
Pilot valve stuck in open position Replace gas control
Six flashes,
one flash,
three second
pause (Soft
Lockout)
Failed to light pilot,
system resets after
(5) minutes
1. Unstable pilot
2. Pilot tube block or restricted
3. Oxidation build-up on pilot
electrode
4. Wire damage to pilot
assembly or bad connection at
g
as valve
1. See Burner Inspection on
page 17
2-4. See Pilot Inspection,
Testing and Replacement on
page 19
Observe the green LED on the water heater gas
control. Diagnostic codes are displayed with a 3
second pause before repeating. Once the diagnostic
code is known, check and repair the water heater, as
recommended in the table below.
Troubleshooting
Green LED
13