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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 ©
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.
TEST 2
Polarity Check
Check from on/off switch center and white wire terminals to ground
115-125 VAC is not present see Test 1.
Voltage is present white (right terminal) to ground but not
black (center terminal) to ground
reverse supply wire connections - polarity is
reversed.