44
120 volts across
black and white
transformer
primary leads on
back of R8285 ?
Thermostat
calls for heat
Circulator
start?
* Power off
* Blown fuse or
tripped breaker
* Miswired or
loose electri cal
connection in
120 volt line
120 volts across
circulator
connections?
* Loose connect ion in
t'stat or z one valve end
switch wiring
* Defective t'stat or z one
valve end switch
* T'stat or zone sy stem
miswired-consul t zone
valve or t'stat
manufacturer's
instruct ions.
N
Induced
draft fan
start?
120 volts
present?
24 volts present
across yel low
and orange
connections on
R8222?
* Boiler off on
high limit
* Defective
high limit
* Defective
R8222 relay -
see note 6 on
page 43.
* Socket not fully
seated on relay
Y
Y
N
N
Y
N
Y
N
START
Y
N
Y
24volts across R
and C on R8285
fan center?
* Defecti ve
transformer.
Replace R8285.
See note 5 on
page 43
24 volts across
G and C on
R8285 fan
center?
* Seized or
defective
circulat or
* Defective relay on
R8285 - see note 6 on
page 43
* Relay not fully seated
in socket
* Loose connect ion in
circulator wiring
Unplug fan and
check for 120 volts
across blac k and
white connecti ons
on female half of
plug.
* Loose
connection at
fan plug or fan
capacitor
* Defective
capacitor
* Defect ive fan
24 volts
present across
yellow and
purple
connections on
R8222?
Reconnect fan
* Kinked or block ed
vacuum switch tubing
* Defective vacuum
switch
Wait 30-50
seconds
(prepurge)
Continued on
next page
N
Y
N
Y
NY
BWF Troubleshooting Chart