Broan 42H-B, 42-B owner manual Troubleshooting, Intellifire Ignition System

11 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 person 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.

A. Intellifire Ignition System

	Symptom		Possible Causes	Corrective Actions
1.	The ignitor/module makes	A.	Incorrect wiring.	Verify “S” wire (white) for sensor and “I” wire (orange) for ignitor are connected to the
	noise, but no spark.			correct terminals on the module and the pilot assembly. Reversed wires at the module
				may cause the system to make a sparking noise, but the spark may not be present at
				pilot hood.
		B.	Loose connections or	Verify there are no loose connections or electrical shorts in wiring from module to
			electrical shorts in the	pilot assembly. The rod closest to the pilot hood should be ignitor. Verify connections
			wiring.	underneath pilot assembly are tight; also verify the connections are not grounding out
				to the metal chassis, pilot burner, pilot enclosure, mesh screen if present, or any other
				metal object.
		C.	Ignitor gap is too large.	Verify gap of ignitor to pilot hood. The gap should be approximately .17 in. or 1/8 in.
		D.	Faulty module.	Turn ON/OFF rocker switch or wall switch to OFF position. Remove ignitor wire “I”
				from module. Place ON/OFF rocker switch or wall switch in ON position. Hold ground
				wire about 3/16 in. away from “I” terminal on module. If there is no spark at “I” terminal,
				module must be replaced. If there is a spark at “I” terminal, module is fine. Inspect pilot
				assembly for shorted sparker wire or cracked insulator around electrode.
2.	Pilots won’t light, there is	A.	Transformer installed	Verify that transformer is installed and plugged into module. Check voltage of
	no noise or spark.		incorrectly.	transformer under load at space connection on module with ON/OFF switch in ON
				position. Acceptable readings of a good transformer are between 3.2 and 2.8 volts AC.
		B.	A shorted or loose	Remove and reinstall the wiring harness that plugs into module. Verify there is a tight
			connection in wiring	fit. Verify pilot assembly wiring to module. Remove and verify continuity of each wire in
			configuration or wiring	wiring harness.
			harness.
		C.	Improper wall switch	Verify wall switch is wired correctly.
			wiring.
		D.	Module not grounded.	Verify black ground wire from module wire harness is grounded to metal chassis of
				appliance.
		E.	Faulty module.	Turn ON/OFF rocker switch or wall switch to OFF position. Remove ignitor wire “I”
				from module. Place ON/OFF rocker switch or wall switch in ON position. Hold ground
				wire about 3/16 in. away from “I” terminal on module. If there is no spark at “I” terminal
				module must be replaced. If there is a spark at “I” terminal, module is fine. Inspect pilot
				assembly for shorted sparker wire or cracked insulator around electrode.
3.	Pilot lights but continues	A.	A shorted or loose	Verify all connections to wiring diagram in manual. Verify connections underneath pilot
	to spark, and main burner		connection in sensor rod.	assembly are tight. Verify connections are not grounding out to metal chassis, pilot
	will not ignite. (If the pilot			burner, pilot enclosure or screen if present, or any other metal object.
	continues to spark after	B.	Poor flame rectification or	Verify flame is engulfing sensor rod. If the pilot assembly does not have a ground
	the pilot flame has been
			contaminated sensor rod.	strap, consider installing one to increase flame rectification. Verify correct pilot orifice
	lit, flame rectification has
				is installed and inlet gas specifications are met. Flame carries rectification current, not
	not occurred.)
				the gas. If flame lifts from pilot hood, the circuit is broken. A wrong orifice or too high
				an inlet pressure can cause pilot flame to lift. The sensor rod may be contaminated.
				Clean sensor rod with emery cloth.
		C.	Module is not grounded.	Verify that module is securely grounded to metal chassis of appliance. Verify that the
				wire harness is firmly connected to module.
		D.	Damaged pilot assembly	Verify that ceramic insulator around the sensor rod is not cracked, damaged, or loose.
			or dirty sensor rod.	Verify connection from sensor rod to white sensor wire. Clean sensor rod with emery
				cloth to remove any contaminants that may have accumulated on sensor rod. Verify
				continuity with a multimeter with ohms set at lowest range.
		E.	Faulty module.	Turn ON/OFF rocker switch or wall switch to OFF position. Remove ignitor wire “I”
				from module. Place ON/OFF rocker switch or wall switch in ON position. Hold ground
				wire about 3/16 in. away from “I” terminal on module. If there is no spark at “I”
				terminal, module must be replaced. If there is a spark at “I” terminal, module is fine.
				Inspect pilot assembly for shorted sparker wire or cracked insulator around electrode.
4.	Pilot sparks, but pilot will	A.	Correct gas supply.	Verify that incoming gas line ball valve is “open”. Verify that inlet pressure reading is
	not light.			within acceptable limits, inlet pressure must not exceed 14 in. w.c.
		B.	Ignitor gap is too large.	Verify that spark gap from ignitor to pilot hood is .17 in. or 1/8 in.
		C.	Module is not grounded.	Verify module is securely grounded to metal chassis of appliance.
		D.	Module voltage output/	Replace module.
			valve/pilot solenoid ohms
			readings.

22 Heat & Glo LifeStyle Collection • Dakota 42-B/Dakota 42H-B • 4036-909 Rev D • 08/06