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Section 5. Troubleshooting
Heater Will Not Fire - D
Start
IMPORTANT! READ ME FIRST!
Gas flows during
ignition try, but burner
does not fire.
NO
NO
YES
Go back to chart “HEATER WILL
NOT FIRE-C” (Page 44).
Check voltage across
igniter leads; OK?
Replace Ignition
Control Module.
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
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 voltmeter 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.