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Page 17
LED Status Control Status Probable Cause Service Procedure
None (LED
not on or
flashin
g)
No electrical power
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 20
2-4. See Pilot Inspection,
Testing and Replacement on
page 22
Two flashes,
three second
pause
Pressure switch not
working-closed
position
1. Pressure switch tubing kinked
or blocked
2. Blocked pressure tap on
switch or blower
3. Fault
yp
ressure switch
1-3. See Pressure Switch
Testing on page 25
Three
flashes,
three second
pause
Pressure switch or
blower temperature
switch not working-
open position
1. Vent blockage or improper
vent configuration
2. Pressure switch tubing kinked
or blocked
3. Faulty pressure switch
4. Blower not spinning up to
speed
5. Blower temperature or
exhaust temperature too high
6. Faulty blower temperature
switch
1. Check vent or vent tables
2-3. See Pressure Switch
Testing on page 25
4. See Blower Testing on
page 28
5-6. See blower Temperature
Switch Testing on page 31
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
O
bserve the green LED on the water heater gas con-
trol. Error codes are displayed with a 3 second pause
before repeating. Once the error code is known, check
and repair the water heater, as recommended in the
table below.
Troubleshooting
Green LED
17