Crown Boiler CWI069, CWI172, CWI345, CWI310, CWI103, CWI276, CWI Series 5&6 on, National Fuel Gas Code

Main			Do burners					Do burner and
	Y	shut dow n before				Y				Y
								circulator shut
burners			gage temp								END
								dow n at end of
light?		exceeds high limit
								call for heat?
			setting +15F?
N					N				N
24 volts	N			*Defective damper
across				*Defective L8148E
B1&B2?
				*Defective damper			*Defective
Y							L8148A
				harness			*Sensing bulb not
				*Loose damper
							bottomed out in
				harness connection			w ell
24 volts across				*Obstruction in path
				of damper blade

standing pilot gas
valve terminals or								Pull w ire off of T		N
terminals		5&6 on				Refer to standing pilot or
				Y				terminal on
S8600 module?						intermittent ignition		aquastat. Does
						troubleshooting chart	boiler shut dow n?
						(page 41 or 42).
		N							Y
24 volts			Y
					*Chimney blockage
across spill
sw itch?					*Chimney system not			*T'stat or
	N				constructed in accordance			zone valve
					w ith Parts 7 and 10 of			w iring calling
24 volts					National Fuel Gas Code.			for heat
					*Dow n draft			*T'stat w ires
across
								shorted
rollout					*Inadequate combustion air
sw itch?			Y
					supply in boiler room
	N
					*Rollout sw itch open.				*Internal boiler
*Loose electrical
					Replace w ith exact				w iring
connection in 24					replacement (see parts				problem,
volt w iring					list). Check for blocked				consult Crow n
betw een B1 or B2					heat exchanger.				representative
and gas valve or
module

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