Test 8: Igniter Heats, No Main Burner - A.O. Smith SERIES 120 Service Handbook

TEST 8: IGNITER HEATS, NO MAIN BURNER

E1 Plug to Pin 9
TEST 8
IF.........
short heat up time of igniter
Normal warm up (Approximately 20 seconds) -
No ignition
No voltage present E4, Pin 12 to ground
24 Volt was present from E1, Pin 12 to ground,
but no main burner
Servicing should only be performed by a Qualifi ed Service Agent
TROUBLESHOOTING
24 V.
Figure 27
IGNITER HEATS......NO MAIN BURNER
then............
check control box grounding.
check for 24V from E1, Pin 12 to ground during 4 second trial. If Yes, continue. If No,
replace Ignition Board
replace ignition board.
• check that air has been purged from gas circuit.
• check that wiring and connections to gas valve and E1, Pin 9 are correct.
• check for 24 VAC at E1, Pin 9 to ground during 4 second trial for ignition.
34
E1 Plug to Pin 12