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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 6 - INDUCER ON.............NO IGNITION
Conditions:
● Power on
● Plugs in receptacles
● Inducer operating
● No power to Hot Surface IGNITOR
(HSI) Note LED flash code
TEST 6
24 VAC Check of Blower Prover/Low Gas Pressure Circuit
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ignition board receptacles E1, Pin 7 to ground shows no voltage replace Ignition board
E1, Pin 7 has 24 Volt recudni morf dna ot noitcennoc eriw kcehcdnuorg ot
voltage check of each blower switch terminal to ground shows
voltage to only 1 terminal
Switch is open - check for proper draft (should also see LED 3 flash
code)...Check for blocked exhaust.... Check that blower outlet exhaust
damper is open....Replace blower (draft) proving switch
Natural Gas ONLY!
24V is present from each switch terminal to ground Check wiring from blower switch to low gas pressure switch
Voltage c
heck to each terminal of low gas pressure switch and
ground shows only voltage on 1terminal
Switch is open - test for a minimum of 5.2 ± " W.C. Natural Gas or
10.5" Propane, flowing supply gas pressure (should also see 3 Flash
LED code)..............Replace low gas pressure switch
Voltage is present to each pressure switch terminal and ground Check wiring from low gas pressure switch to ignition board
receptacles E1, Pin 10
INDUCER EXHAUST/
VENT CONNECTION
DRAFT PROVING
PRESSURE
SWITCH
LOW GAS
PRESSURE
SWITCH
INDUCER
MOTOR