Heater Will Not Fire - D
Start
Gas flows during igni- tion try, but burner does not fire.
YES
Check for 120 VAC at Igniter leads during ignition try.
NO
Check for 120 VAC between S1 and S2 terminals on Ignition Control Module during ignition try.
NO
Check for 120 VAC between L1 and L2 terminals on Ignition Control Module.
YES
Replace Ignition
Control Module.
NO
YES
YES
NO
Go back to chart “HEATER WILL NOT
Check gas pressure? OK?
Fix wiring between S1 and S2 terminals on Ignition Control Module and HSI Igniter.
Fix wiring between L1 and L2 terminals on Ignition Control Module and Terminal Board.
YES
NO
Replace HSI Igniter.
Replace gas line with larger line or replace regulator.
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