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Technical Training Department ©2003
Ashland City, Tennessee
SBN TANK TYPE COMMERCIAL GAS WATER HEATER
SERVICE HANDBOOK
TEST 2 - POLARITY CHECK
Conditions:
No hot water
Green “Power” LED is on.
Tank is more than 5° F
below temperature dial
setting.
Red ignition control board
diagnostic LED is flashing
6 times between pauses.
Red, diagnostic “Call for
Heat” LED-OFF.
Display
LED’s
FLASH CODES OF DIAGNOSTIC INDICATOR
Conditions:
Power On
Red, heater control “Call for Heat” LED – on
Red, ignition control board diagnostic LED – Flashing
Note LED Flash Code before resetting heater.
LED Status Indication
1 Flash System is in lock out.
2 Flashes Draft proving (pressure) switch failed to open within 5 seconds at the end of the last cycle.
3 Flashes Draft proving (pressure) switch failed to close ( -2.1 inches of water column pressure) within 5
seconds after the inducer was started.
The low gas pressure switch )closes at 5.2" ± .04" w.c.) may have remained open.
4 Flashes Open on high temperature limit switch (ECO).
6 Flashes 115-volt supply power connection is indicating reversed polarity.
7 Flashes Flame sensor reads a low flame signal for more than 4.25 sec.
8 Flashes No ignition sensed.
Continuous Flash Continuous flame sensed for more than 5 seconds without gas valve being energized.
Continuous ON Internal control board failure.
*Control system self adjusts to use a minimum voltage for ignition. Lower voltage results in lower igniter temperature
which results in longer igniter life. Igniter voltage may vary from Nominal 80 VAC.
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