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Technical Training Department
©2003
Ashland City, Tennessee
SBN TANK TYPE COMMERCIAL GAS WATER HEATER
SERVICE HANDBOOK
TEST 6 - INDUCER ON-NO IGNITION
Conditions:
Power on
Plugs in receptacles
Inducer operating
No power to Hot Surface Igniter (HSI)
Note flash code of LED
TEST 6
24 VAC Check of Blower Prover/Low Gas Pressure Circuit
Draft Proving Pressure
Switch
Exhaust
Outlet
Optional Hot
Water Outlet
Inducer
Draft Exhaust
Low Gas
Pressure
Switch
If…
...then
igntion board receptacles E1, Pin 7 to ground
show s
no voltage
replace Ignition board
E1, Pin 7
has 24 Volt
to ground
check wire connection to and from inducer
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
24V
is present
from each switch terminal to ground.
•
check wiring from blower switch to low gas
pressure switch
voltage check to each terminal of low gas pressure
switch and ground
show s only voltage on 1
terminal
•
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 recetacles E1, Pin 10
