Crown Boiler CWI241, CWI172, CWI345, CWI310, CWI103, CWI276 Start, L2 ?, National Fuel Gas Code

Troubleshooting Chart for CWI Boilers Equipped with Tankless Heaters and Dampers Caution: Read page 36 before attempting to use this chart

START

No call for heat,

Allow boiler w ater

boiler w ater

Vent

Y

Main

Y

temperature to

temp. at least

damper

burners

reach low limit +

20F below low

open?

light?

differential setting.

limit setting

N

N

Initiate call for heat

24 volts

N

across TV

*Defective damper

and Z?

N

24 volts across

24 volts

N

*Defective damper

across B1and

gray w ire on

Y

harness

TV on L8124E ?

rollout sw itch

120 volts

and B2?

*Loose damper

across L1 &

Y

harness connection

Y

L2?

N

*Obstruction in path

Y

*Boiler w ater

temp above

of damper blade

low limit

setting

* Defective

24 volts across

*Defective

transformer in

standing pilot gas

L8124E

valve terminals or

Y

L8124E

terminals 5&6 on

S8600 module?

*Pow er off

Refer to standing

N

pilot or

*Blow n fuse or

intermittent

ignition

24 volts

tripped breaker

24 volts

Y

troubleshooting

betw een pins

chart (page 41 or

*Misw ired or

across spill

1&4 (blue&yellow )and

42).

sw itch?

2&4 (orange&yellow ) on

loose electrical

damper end of damper

N

connection in

N

*Chimney blockage

harness? See

120V line

Note 7 on page 36.

*Chimney system not

24 volts

constructed in accordance

Y

w ith Parts 7 and 10 of

24 volts

across

Y

N

National Fuel Gas Code.

Y

across TV

rollout

& Z?

sw itch?

*Dow n draft

*Obstruction in

N

*Inadequate combustion air

path of damper

blade

* Loose

supply in boiler room

connection

*Defective

betw een

*Loose electrical

damper motor

damper

connection in 24

harness and

* Defective

*Rollout sw itch open.

volt w iring

*Loose connection

L8124E

L8124E

betw een rollout

Replace w ith exact

betw een damper

*Defective

sw itch orB2 and

replacement (see parts

harness and

gas valve or

list). Check for blocked

damper

damper

module

heat exchanger.

harness.

40

39