SBN TANK TYPE COMMERCIAL GAS WATER HEATER
SERVICE HANDBOOK
CONTROL BOARD DIAGNOSTIC LED INTERPRETATION AND
TROUBLESHOOTING
TEST 1 - 120 VAC CHECK TO WATER HEATER
Conditions:
No Green display “Power” LED on.
Plugs are in receptacles.
Supply power breaker is not “open”
On/Off heater switch is “On”.
Water Heater
Control
Ignition Control Board
TEST 1
120 Vac Check To Water Heater On Switch
Check for
115 V check to E13 terminal and 2B receptical.
If… | ...then |
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voltage is not present from on/off switch- | check conditions above |
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center black wire to ground | check wiring from switch to break box |
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power is present from center on/off | check power from on/off to ignition board term |
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terminal | E13. |
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| check wiring from on/off. |
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voltage is not present at E13 to ground | to E13. |
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| replace on/off switch. |
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power is present at E13 | check power from E14 to heater control E2 |
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receptacle |
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voltage is not present from heater control | check wiring from ignition control board E14 to |
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heater control receptacle E2. |
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receptacle E2 black to ground |
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replace ignition control board. |
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power is present at E2 | green LED should be on. |
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©2003 | 26 | Technical Training Department | |
Ashland City, Tennessee