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
Draft Proving Pressure
Switch
Optional Hot
Water Outlet
Low Gas
Pressure
Switch
Draft Exhaust
Exhaust
Outlet
Inducer
TEST 6
24 VAC Check of Blower Prover/Low Gas Pressure Circuit
If… |
| ...then |
|
igntion board receptacles E1, Pin 7 to ground shows |
| replace Ignition board |
|
no voltage |
|
|
|
E1, Pin 7 has 24 Volt to ground |
| check wire connection to and from inducer |
|
voltage check of each blower switch terminal to |
| •switch is open - check for proper draft (should | |
ground shows voltage to only 1 terminal |
| 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 is open - test for a minimum of 5.2 ± " | |
switch and ground shows only voltage on 1 |
| W.C. Natural Gas or 10.5" Propane, flowing |
|
terminal |
| supply gas pressure (should also see 3 Flash | |
|
| LED code) |
|
|
| •replace low gas pressure switch |
|
voltage is present to each pressure switch terminal |
| check wiring from low gas pressure switch to | |
and ground |
| ignition board recetacles E1, Pin 10 |
|
Technical Training Department | 31 | ©2003 | |
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Ashland City, Tennessee