SBN71-120 thru SBN85-390, SBD30-150/199 TANK TYPE COMMERCIAL
GAS WATER HEATER SERVICE HANDBOOK
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.
LED Status | Indication | |
1 | Flash | System is in lock out. |
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2 | Flashes | Draft proving (pressure) switch failed to open within 5 seconds at the end of the last |
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| cycle. |
3 | Flashes | Draft proving (pressure) switch failed to close ( |
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| within 5 seconds after the inducer was started. The low gas pressure switch )closes |
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| at 5.2" ± .04" w. c.) may have remained open (Nat Gas only.) |
4 Flashes | Open on high temperature limit switch (ECO). | |
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5 Flashes | Not Used | |
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6 Flashes | ||
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7 Flashes | Flame sensor reads a low flame signal for more than 4.25 sec. | |
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8 | Flashes | No ignition sensed. |
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Continuous Flash | Continuous flame sensed for more than 5 seconds without gas valve being energized. | |
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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.
State Water Heaters | 34 | Technical Training Department |
Ashland City, Tennessee © 2007 |
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