Crown Boiler BSI276 Manual De Usuario

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

Is there an audible

click as R8225 relay

pulls in w hen the

thermostat calls for

heat?

Does relay

pull in now ?

Vent

damper

open?

START

Thermostat

calls for heat

24 volts across

blue and yellow

w ires inside

junction box?

120 volts across

black and w hite

transformer

leads?

*Pow er off
*Blow n fuse or
tripped
breaker
*Misw ired or
loose 120 volt
connection

* Defective
transformer
See Note #6 on
page 34

* Bad connection in
thermostat w iring
* Defective thermostat
* Thermostat misw ired or
misapplied

24 volts betw een

P2 and 2 on

CG400 LWCO?

* Jumper missing
betw een 1 and P1 on
CG400
* Poor connection
betw een transformer
and terminals 1 & 2 on
CG400

24 volts present

betw een each

pressure limit

connection and

yellow transformer

connection?

* Boiler off on pressure limit
* Defective pressure limit

Is 24 volts

present across

brow n and

yellow leads on

R8225 relay?

Disconnect
thermostat and
temporarily jump
boiler thermostat
connections
together

* Loose
connection
betw een
transformer
and R8225
coil

* Defective
R8225
See Note #7
on page 34

Is yellow

LED lit on

LWCO?

* Boiler off on low w ater
* Loose probe connection
* Poor ground path from
heat exchanger to CG400
case

24 volts present

across blue lead on

R8225 and yellow

transformer leads?

* Defective R8225