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45
BWF Troubleshooting Chart (contd.)
Caution: Read page 43 before attempting to use this chart.
Pilot
light?
24 volts
between
terminals
5
and
6
on S8670?
See "Intermittent
Ignition System
Troubleshooting
Chart" on next page
24 volts
between
NO
terminal on
vacuum switch
and
C
on
R8285D?
Minimum
vacuum at
switch called for
in Table 9 on
page 42 ?
*
Defective
vacuum switch
*
Blockage in venting system
*
Vent system not installed in
accordance with installation manual
*
Excessive silicone on I.D. of vent
system joints
*
Blockage, condensate or leakage in
vacuum switch tubing
*
Improperly sealed flue collector
*
Damaged or missing fan gasket
*
Defective fan
*
Wind at horizontal vent terminal in
excess of 40 mph
* Rollout switch
open. Replace
switch with exact
replacement,
Crown Part #
960122. Check for
blocked heat
exchanger
Main
burners
light?
N
Do burner,
circulator and
fan shut down at
end of call for
heat?
END
Y
Does boiler shut
down when t'stat
wire is removed from
terminal
R
on
R8285?
*
T'stat or zone valve
wiring calling for heat
*
T'stat wires shorted
*
Internal boiler wiring
problem, consult
Crown representative
Y
N
N
Y
Do burners shut
down before gauge
temp exceeds
high limit setting
+15F?
*
Defective L4080B
*
Sensing bulb not bottomed
out in well
N
Y
N
N
N
Y
Y
Continued
from previous
page
Y
N
Y