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27
Heater Will Not Fire - D
Start
Gas flows during igni-
tion try, but burner
does not fire.
Check for 120 VAC at
Igniter leads during
ignition try.
Check for 120 VAC
between S1 and S2
terminals on Ignition
Control Module during
ignition try.
Check for 120 VAC
between L1 and L2
terminals on Ignition
Control Module.
Replace Ignition
Control Module.
YES
YES
NO
NO
NO
NO
NO
YES
YES
YES
Go back to chart “HEATER
WILL NOT FIRE-C”
(Page 26).
Check gas pressure? OK?
Replace HSI Igniter.
Replace gas line with larger
line or replace regulator.
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.