Crown Boiler CWI Series, CWI172, CWI345, CWI310, CWI103, CWI276, CWI069, CWI241, CWI379 Start, C1&C2?

Troubleshooting Chart for CWI Boilers Without Tankless Heaters Caution: Read page 36 before attempting to use this chart

START

Thermostat calls for heat

*Pow er off

*Blow n fuse or tripped breaker

*Misw ired or loose electrical

Circulator start?

N

N120 volts at L1&L2?

Y

	N
Y	Boiler	Y	Vent	Y
	Equipped
			damper
	With
			open?
	Damper?
			N

24 volts

across B and R Y (limit sw itch) in

L8148E ?

connection in 120V line

Remove t'stat or zone valve end sw itch w ires from T&TV terminals on L8148E. Install temporary jumper across terminals T and TV.

120 volts at

C1&C2?

N

Y24 volts across T&TV?

N

120volts

Y across terminals at circulator?

Y

*Seized or defective circulator

		*Boiler off on
N	N	limit
		*Defective
		high limit.

24volts

betw een pins

1&4 (blue&yellow )and

2&4 (orange&yellow ) on

damper end of damper N harness? See

Note 7 on page 28.

Does		N	*Defective
circulator			L8148E-see
run now ?
			Note 6 on page
			36.
	Y

*Loose connection in t'stat or zone valve end sw itch w iring

*Defective t'stat or zone valve end sw itch

*T'stat or zone system misw ired-consult t'stat or zone valve manufacturer's instructions

*Bad electrical connection betw een C1 or C2 and circulator

Y

*Obstruction in path of damper blade

*Defective damper motor

*Loose connection betw een damper harness and damper

*Loose connection betw een damper harness and L8148E

*Defective damper harness.

*Defective L8148E

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