SBN TANK TYPE COMMERCIAL GAS WATER HEATER
SERVICE HANDBOOK
LED INDICATORS ON HOT SURFACE IGNITION (HSI)
USING FLASHING RED LED ON HSI (HOT SURFACE IGNITION)
| LED STATUS | INDICATION | ACTION TO BE TAKEN |
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| 1 Flash | System is in lockout. | Interrupt power to |
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| reset. Heater had not |
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| sensed the flame – |
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| check gas supply and |
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| igniter condition. |
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| 2 Flashes | Draft proving | Test for defective |
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| (pressure) switch | switch or a |
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| (closes at | pressurized room |
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| inches W.C. negative | condition that may be |
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| pressure) failed to | forcing air through the |
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| open within 5 seconds | inducer. |
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| at the end of the last |
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| cycle. |
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| 3 Flashes | Draft proving | Check the draft. |
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| (pressure) switch | The low gas pressure |
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| failed to close | switch closes at 5.2 inches W.C. |
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| within 5 seconds after | may have remained open. |
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| the inducer was | Verify the supply gas pressure |
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| started. | while the gas is flowing. |
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| 4 Flashes | Open on high | Check temperature |
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| control operation. |
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| temperature |
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| limit switch |
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| (ECO) |
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| 6 Flashes | Verify that a |
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| check results |
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| connection is | in “0” volts and a |
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| indicating reversed | ground check |
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| polarity. | results in |
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©2003 | 38 | Technical Training Department | ||
Ashland City, Tennessee
