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SBN71-120 thru SBN85-390, SBD30-150/199 TANK TYPE COMMERCIAL
GAS WATER HEATER SERVICE HANDBOOK
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Ashland City, Tennessee 7002 ©
WATER HEATER CONTROL BOARD TROUBLESHOOTING AND DIAGNOSTIC LED
INTERPRETATION
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.
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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 (Nat Gas only.)
4 Flashes Open on high temperature limit switch (ECO).
5 Flashes Not Used
6 Flashes 115-volt supply power connection is indicating reversed polarity.
7 Flashes Flam
e 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 IGNITOR
temperature which results in longer IGNITOR life. IGNITOR voltage may vary from Nominal 80 VAC.