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Heater Will Not Fire - D
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IMPORTANT! READ ME FIRST!!
If your heater is correctly connected to 240 Volts AC, The
Ignition Control Module (ICM) will convert the 240VAC to
an intermittent pulse to the ignitor. Digital meters don’t read
this type of signal well. (An analog meter will give a better
reading than a digital meter). If the ICM is bad, your volt-
meter will read either 0 VAC or 240 VAC. If your ICM is
good, your meter will read some voltage between 0 and
240 VAC. Exactly what reading you get will depend on the
meter, but with a good ICM, the reading won’t be 0 VAC or
240 VAC, but somewhere in between.
IMPORTANT! READ ME FIRST!!
Gas flows during igni-
tion try, but burner
does not fire.
NO
NO
YES
Go back to chart “HEATER WILL
NOT FIRE-C” (Page 26).
Check voltage across
igniter leads; OK?
Replace Ignition
Control Module. On a
120 V installation,
check the ignitor for
damage if it has seen
240 VAC.
NO
YES
Replace HSI Igniter.
Check gas pressure. OK?.
Increase gas flow into heater:
• Replace gas line with larger
line;
• Replace regulator;
• Replace meter; or
• All of the above.
YES