Heatiator NNXT3933IL Troubleshooting, A. Intellifire Plus Intermittent Ignition System, Symptom

16 Troubleshooting

With proper installation, operation, and maintenance your gas appliance will provide years of trouble-free service. If you do experience a problem, this troubleshooting guide will assist a qualified service technician in the diagnosis of a problem and the corrective action to be taken. This troubleshooting guide can only be used by a qualified service technician. Con- tact your dealer to arrange a service call by a qualified service technician.

A. Intellifire Plus™ Intermittent Ignition System

Symptom	Possible Cause	Corrective Action
1. Pilot won’t light.	A. Incorrect wiring.	Verify “S” wire (white) for sensor and “I” wire (orange) for ignitor are
The ignitor/module		connected to correct terminals on module and pilot assembly.
makes noise, but no
	B. Loose connections or electrical	Verify no loose connections or electrical shorts in wiring from mod-
spark.
	shorts in the wiring.	ule to pilot assembly. Verify connections underneath pilot assembly
		are tight; also verify igniter and flame sense wires are not grounding
		out to metal chassis, pilot burner, pilot enclosure, mesh screen if
		present, or any other metal object.
	C. Ignitor gap is too large.	Verify gap of igniter to right side of pilot hood. The gap should be
		approximately .17 in. or 1/8 in. (3 mm).
2. Pilot won’t light,	A. No power or transformer installed	Verify that transformer is installed and plugged into module. Check
there is no noise or	incorrectly.	voltage of transformer at connection to module. Acceptable read-
spark.		ings of a good transformer are between 6.4 and 6.6 volts AC.
	B. A shorted or loose connection in	Remove and reinstall the wiring harness that plugs into module.
	wiring configuration or wiring har-	Verify there is a tight fit. Verify pilot assembly wiring to module. Re-
	ness.	move and verify continuity of each wire in wiring harness. Replace
		any damaged components.
	C. Improper wall switch wiring.	Verify that 120/VAC power is “ON” to junction box.
	D. Module not grounded.	Verify black ground wire from module wire harness is grounded to
		metal chassis of appliance.
3. Pilot sparks, but	A. Gas supply.	Verify that incoming gas line ball valve is “open”. Verify that inlet
Pilot will not light.		pressure reading is within acceptable limits.
	B. Ignitor gap is too large.	Verify gap of igniter to right side of pilot hood. The gap should be
		approximately .17 in. or 1/8 in. (3 mm).
	C. Module is not grounded.	Verify module is securely grounded to metal chassis of appliance.
	D. Pilot valve solenoid	Verify that 1.5 to 1.8 VDC is supplied to pilot solenoid from module.
		If below 1.5 volts, replace module. If 1.5 volts or greater, replace
		valve.

66 Heatilator • Novus NNXT • 4055-879 • Rev. o • 2/12