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Technical Training Department
Ashland City, Tennessee
SBN TANK TYPE COMMERCIAL GAS WATER HEATER
SERVICE HANDBOOK
©2003
LED INDICATORS ON HOT SURFACE IGNITION (HSI)
USING FLASHING RED LED ON HSI (HOT SURFACE IGNITION)
1 Flash
2 Flashes
3 Flashes
4 Flashes
6 Flashes
System is in lockout.
Draft proving
(pressure) switch
(closes at -2.10 +0.01
inches W.C. negative
pressure) failed to
open within 5 seconds
at the end of the last
cycle.
Draft proving
(pressure) switch
failed to close
within 5 seconds after
the inducer was
started.
Open on high
temperature
limit switch
(ECO)
115-volt supply power
connection is
indicating reversed
polarity.
Interrupt power to
reset. Heater had not
sensed the flame –
check gas supply and
igniter condition.
Test for defective
switch or a
pressurized room
condition that may be
forcing air through the
inducer.
Check the draft.
The low gas pressure
switch closes at 5.2 inches W.C.
may have remained open.
Verify the supply gas pressure
while the gas is flowing.
Check temperature
control operation.
Verify that a neutral-to-ground
check results
in “0” volts and a hot-to-
ground check
results in 115-125 VAC.
LED STATUS INDICATION ACTION TO BE TAKEN