Crown Boiler BSI172, BSI241, BSI276, BSI345, BSI379, BSI103, BSI138, BSI069, BSI207, BSI310 Start

Troubleshooting Chart for BSI Boilers Equipped with

Hydrolevel CG400A Low Water Cut-offs and Vent Dampers

Caution: Read page 34 before attempting to use this chart

START

Vent

Y

damper

Is there an audible

open?

Thermostat

N

click as R8225 relay

Y

calls for heat

pulls in w hen the

thermostat calls for

heat?

Is yellow

LED lit on

LWCO?

Y

N

120 volts across

N

24 volts betw een

N

black and w hite

P2 and 2 on

transformer

CG400 LWCO?

leads?

* Jumper missing

Y

24 volts across

betw een 1 and P1 on

blue and yellow

Y

CG400

w ires inside

* Poor connection

N

N

junction box?

betw een transformer

and terminals

1 & 2 on

CG400

Y

24 volts present

betw een each

N

* Boiler off on low w ater

*Pow er off

pressure limit

* Loose probe connection

*Blow n fuse or

Is 24 volts

connection and

* Poor ground path from

yellow transformer

tripped

present across

heat exchanger to CG400

connection?

breaker

brow n and

case

*Misw ired or

N

yellow leads on

loose 120 volt

R8225 relay?

connection

Y

* Boiler off on pressure limit

Y

* Defective pressure limit

Disconnect

* Defective

* Defective

thermostat and

R8225

transformer

temporarily jump

See Note #7

See Note #6 on

boiler thermostat

on page 34

24 volts present

Y

page 34

connections

across blue lead on

together

R8225 and yellow

transformer leads?

*Bad connection in thermostat w iring

*Defective thermostat

* Thermostat misw ired or	Y
misapplied

Does relay	N
pull in now ?

*Loose connection betw een transformer and R8225 coil

N

* Defective R8225

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