Crown Boiler CWI138, CWI172, CWI345 Intermittent Ignition System Troubleshooting Chart, Start

Intermittent Ignition System Troubleshooting Chart

START

(24 volts is present across 5 and 6 on S8600 module, but main burners do not light)

Caution: Read page 36 before

attempting to use this chart

Spark	Y		Y	Does	Y	Main	Y
across		Pilot		spark stop
						burner	END
ignitor/sensor		lights?		when pilot
						lights?
gap?				lights?
N		N		N		N

			24VAC	N
	24 volts		across
		N	terminals 1&2
	across
	terminals 2&3		on S8600?
	at S8600?
Can you	Y	*Defective	Y
		S8600 module		*Defective
hear	Y
sparking?				S8600
				module
N	24 volts		24 volts
		N		Y
*Faulty	across PV &		between MV &
	MV/PV at gas		MV/PV on gas
S8600	valve?		valve?
module
	Y		N

			*Loose connection in
		*Defective EI
			ignition cable or
*Break in		wiring	ground wire	*Defective EI
spark cable		harness.		harness
insulation			*Pilot electrode
*Break in pilot			porcelain cracked
	* Low line pressure
porcelain			*Pilot flame not
*Incorrect pilot	*Plugged, kinked or leaking		covering gap
			between electrode
	pilot tubing
spark gap			and grounding
					*Defective
	*Plugged pilot orifice		strap
*Loose					gas valve
connection in	*Gas line not purged of air		*Low gas pressure
spark cable			at gas valve inlet
*Loose	*Defective pilot assembly		*Defective S8600
ground	*Defective gas valve		module
connection

43

42