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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 7 – INDUCER ON, PROVER SWITCH AND LOW GAS PRESSURE SWITCH
CLOSED ....................NO IGNITOR OPERATION
Conditions:
● Power on
● Plugs in receptacles
● Inducer on
● 24V at ignition board E1, Pin
10
● No Power to IGNITOR
Note:LED Flash code
TEST 7
Voltage check and continuity check of hot surface IGNITOR
circuit
Continuity check - Power off- Plug removed from E4 receptacles.
Nominal 80 VAC check - Plug in E4- Power "On".
If.......
then.......
Continuity is not indicated between E4plug pin 2 to 4. Check wiring and connection from E4 plug to HSI receiving
plug...................Replace HSI Assembly
Continuity is present Resistance should be between 11 and 20 Ohms at a
temperature of 77°F
Voltage is not present between E4, Pin 2 to ground Replace ignition board
Voltage Ctneserp si ontinue
Voltage is not present between E4, Pin 4 to ground Check wiring and plug connections to HSI.........Replace HSI
Voltage is present Note ignition board, Flash code LED...
..........HSI should work
CHECK E1PIN 10 TO
GROUND – 24 V.
CONTINUITY TEST E4
PLUG
CHECK E4 PIN 4 TO GROUND