Test 10: Main Burner Ignition For Less Than Five Seconds - A.O. Smith SERIES 120 Service Handbook

TEST 10: MAIN BURNER IGNITION FOR LESS THAN FIVE SECONDS

Conditions:
• Power On; plug connected
• Main Burner ignites for approximately five seconds, then goes out.
• Tests 8 and 9 completed
Note the flash code on the ignition board LED.
E1, Pin 2 (From Flame Proving Rod)
TEST 10
IF.........
no extended main burner ignition
still no extended main burner ignition
Servicing should only be performed by a Qualifi ed Service Agent
TROUBLESHOOTING
Hot Surface Igniter (HSI)
HSI Mounted on Main Burner
Figure 29
MAIN BURNER IGNITION FOR LESS THAN FIVE SECONDS
then............
• check wiring and plug connections of hot surface igniter (HSI) assembly plug and
ignition board receptacles E1, Pin 2.
• verify that HSI assembly is not cracked or dirty.
• verify that flame prover will be in main flame.
• replace HSI assembly.
replace ignition control board.
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